CN102383759A - Multifunctional blowout preventer specially used for steam-driven well - Google Patents

Abstract

The invention relates to a multifunctional blowout preventer specially used for a steam-driven well, which is a blowout preventing device applied to operation of a steam-driven well opening and used for opening/closing the well opening and shearing a heat-insulating pipe. The multifunctional blowout preventer is composed of an upper-layer shearing structure and a lower-layer semi-sealing structure. The multifunctional blowout preventer is connected to a remote ground control device through a high-pressure oil pipe. The blowout preventer is controlled by high-pressure oil in the high-pressure oil pipe. The inner diameter of a piston body of the upper-layer shearing structure of the multifunctional blowout preventer and the inner diameter of a cylinder barrel of an oil cylinder are the same and are big enough, so that the blowout preventer has a sufficient pushing and shearing force to shear the heat-insulating pipe and completely seal the well opening when a conventional hydraulic pressure of the remote ground control device is used. The multifunctional blowout preventer is excellent in sealing property, is high-temperature resisting and is a necessary blowout preventing device for the operation of the steam-driven well opening.

Description

Steam flooding well special-purpose multifunctional preventer

Technical field

The present invention relates to a kind of oil field well control device, especially steam flooding well special-purpose multifunctional preventer.

Background technology

At present, well control device used in oil field shaft mouth operation, is mostly the hydraulic blow out preventer controlled with hydraulic pressure, and this well control device is interconnected to constitute by wellhead blowout preventor and control system of ground preventer by high pressure line；Control system of ground preventer is the visual plant for controlling wellhead blowout preventor, also known as remote console, and it connects preventer by high-pressure oil pipe, control preventer is applied by the hydraulic oil in its high-pressure oil pipe；Remote console is made up of base, fuel tank, pump group, accumulator group, manifold, various valve members, instrument and electric cabinet, its major function is, high voltage control liquid is produced by pump group, and be stored in accumulator group, when needing open and close preventer, the high voltage control liquid from accumulator group is assigned in each control object (preventer) by the 3-position 4-way rotary valve of manifold；Its pump group is equipped with two sets of independent power sources, that is electric oil pump and hand oil pump, it is standby that accumulator group has enough highly pressurised liquids to store, meet the control requirement for closing whole preventer groups and the requirement for opening hydraulic operated valve, electric oil pump is controlled with automatic, the control device stopped, the open and close action of each preventer by corresponding 3-position 4-way rotary valve；There is standby pressure source interface on the control manifold of remote console, pressure source can be introduced as needed within；Hydraulic line has two kinds of hard tube line and soft pipeline, typically with soft pipeline, and the two ends of soft pipeline are the snap joint of self-sealing, realize the connection of remote console and preventer；Warning device is installed on remote console, to energy storage pressure, bleed pressure, the operating of oil tank liquid level and electric oil pump is monitored, when alarm limit of the above-mentioned parameter beyond setting, can on remote console to being spoken, visual alarm, indicate that operating personnel take measures, it can operate abnormal alarm in the low alarm of energy storage pressure, the low alarm of oil tank liquid level and electric oil pump；Electric cabinet is fixed on remote console, the motor of connection remote console is installed in the electric line of electric cabinet, motor connects oil pump, when the electro-motor is turning, oil pump is driven to rotate, by entering oil pipe, by the oil suction in fuel tank, and be forced through flowline and be transported in accumulator group, enter oil pipe one end to be fastened on fuel tank, the other end is fastened on oil pump oil inlet, flowline one end is fixedly connected on the oil-out of oil pump, the other end connects check valve inlet, one-way valved outlet connected pipes one end, it connects oil pipe other end connection accumulator group, so when oil pump is rotated, pressure oil is through check valve to accumulator group fuel feeding；Connection pressure controller is installed on electric cabinet, when system pressure reaches certain setting value, pressure controller automatically cuts off power supply, make electric oil pump fuel cut-off, when system pressure is depressured certain value, electric oil pump can reset automatically work, the pressure of accumulator group is so set to remain in certain scope, it is available for operation preventer to be turned on and off at any time, accumulator group installs isolating valve by oil pipe connection, overflow valve, reconnect control manifold, its manifold connects the oil inlet of 3-position 4-way rotary valve, as long as so pulling corresponding 3-position 4-way rotary valve handle, make "ON" can be achieved, the operation of "Off" preventer, so, the pressure oil being stored in accumulator group passes through accumulator isolation valve, oil filter, again after decompression overflow valve decompression, into control manifold, to each 3-position 4-way rotary valve oil inlet, 3-position 4-way rotary valve (liquid rotary valve) used on remote console is " O " type function, rotate valve handle " in " position when, each chamber is not communicated with, and when handle is in "ON" position formula "Off" position, as pressure oil enters one end of oil cylinder in preventer, the fluid of the other end makes through 3-position 4-way rotary valve oil return box；Accumulator group is generally the structure that multiple bladder type hydropneumatic accumulators interconnect, its bladder type hydropneumatic accumulator plays storage energy in hydraulic system, steady pressure, reduce power consumption, compensation leakage is oozed, a variety of effects such as absorption pressure pulsating force and mitigation impulsive force, it is supported on the bracket of remote console securely, it is by shell, capsule and charge valve and hydraulic fluid port composition, shell has charge valve on top, capsule in charge valve connection shell cavity, there is hydraulic fluid port shell lower end, in hydraulic fluid port insertion shell, insufflation gas in its capsule, usually nitrogen, composition accumulator group is combined in several bladder type hydropneumatic accumulator connections, its intracapsular nitrogen has certain pressure, when hydraulic oil is entered in shell by hydraulic fluid port, compress capsule, the air pressure of the nitrogen in capsule is set to increase, the pressure of its hydraulic oil rises to certain amplitude, conversely when using accumulator, due to the hydraulic oil in the High Voltage compressing shell in capsule, carrying oil necessarily has pressure, can by hydraulic fluid port outwardly against, pressure oil is transported to certain position by oil pipe, and electric oil pump is started working, its pressure oil is set to remain certain pressure, so as to control preventer；Preventer be it is a kind of because take precautions against gas blowout accident design, after well kick generation can safe closing well in time device, it is main by housing, switch valve plate hydraulic cylinder assembly, flashboard assembly, side door assembly, manual locking leading screw, oil inlet and oil return mouthful composition, it has blind rams structure, also there is half envelope flashboard structure, or the structure that blind rams and half envelope flashboard are combined, primary structure is, the flashboard cavity of its housing is in Long Circle in vertical longitudinal cross-section, side door is connected by side door bolt with housing in itself, cylinder cap, switch flashboard fluid cylinder, it is fixed together by fluid cylinder connecting bolt and side door, flashboard assembly hangs over switch flashboard liquid cylinder piston bar front end, two way seal is realized using y-shaped ring between side door and switch flashboard fluid cylinder；Sealing device between piston rod and side door is divided into two parts, a part is sealing well pressure, a part is to seal the oil pressure that hydraulic control is produced, sealing mechanism is located between this two department twice, generally, to make the sealing at this very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, when hydraulic control system hydraulic oil, which enters left and right fluid cylinder flashboard, closes chamber, piston driving or so flashboard assembly is promoted to be moved respectively to well head center along housing flashboard chamber, realize shut-in well, when high pressure oil wells, which enter left and right fluid cylinder flashboard, opens chamber, piston driving or so flashboard assembly is promoted to be moved to well head center position is left, open well head, flashboard switch is controlled by hydraulic control system reversal valve；It is also known as ram preventer, and it can so effectively seal against well head by sealing everywhere, that is flashboard top sealing is tightly connected with housing, before flashboard sealing with pipe and preceding sealing being tightly connected each other, being tightly connected between housing and side door, being tightly connected between piston rod and side door；And the wellhead assembly used by steam flooding well mouthful operation, including preventer, design requirement height, it not only wants high temperature resistant, and needs to shear instlated tubular, and its common preventer shearing force can not reach at all, so common preventer can not just shear instlated tubular.

The content of the invention

It is an object of the invention to provide a kind of steam flooding well special-purpose multifunctional preventer, a kind of its preventer provided for steam flooding well mouthful operation, this preventer high temperature resistant seals blowout prevention, and shearing force is strong, can shear instlated tubular.

The object of the present invention is achieved like this：Steam flooding well special-purpose multifunctional preventer is connected with each other with steam flooding well special-purpose multifunctional preventer ground control unit, open and close well head, the blowout hookup of shearing instlated tubular for steam flooding well mouthful operation, steam flooding well special-purpose multifunctional preventer is a kind of to be designed because taking precautions against steam flooding well mouthful gas blowout accident, after well kick generation can safe closing well in time device, it is to be connected by remote control i.e. control system of ground preventer by high pressure line with preventer, applies the on and off and shearing instlated tubular of control preventer by pressure oil by remote control；Steam flooding well special-purpose multifunctional preventer is double ram type preventer structure, its center is main latus rectum structure, and it is left, each internal structure of right structure on two sides, specification is identical, corresponded between each part of left side structure and each part of right side structure, its corresponding component shape, size, specification is identical, left side structure is relatively symmetrically connected with right side structure with main latus rectum structure, steam flooding well special-purpose multifunctional preventer is by housing, port connection, shear ram cylinder head, shear ram cylinder tube, shear ram side door, shear ram, shear ram side seal, shear ram top is sealed, shear ram piston, shear ram flashboard locks screw mandrel, oil cylinder nut, half oil sealing cylinder bolt, half envelope piston assembly, half envelope flashboard, half envelope flashboard top sealing, sealed before half envelope flashboard, shear ram control cylinder bolt, side door bolt, half envelope cylinder tube, half sealing wire bar, half envelope oil cylinder head etc. is constituted；Upper strata is shear ram flashboard structure, and lower floor is half seal structure；There is half envelope flashboard chamber in its lower floor, and built-in half seals flashboard, and there are shear ram flashboard chamber, built-in shear ram in upper strata；Its upper strata is shear ram structure, it is mainly made up of housing layer shell flashboard chamber switch valve plate hydraulic cylinder assembly, shear ram flashboard assembly, manual locking screw mandrel, oil inlet and oil return mouthful, the upper strata left and right sides of housing to be had respectively communicated with the main latus rectum of casing center and the main latus rectum arranged on left and right sides of the heart wherein, symmetrical shape and structure specification identical shear ram flashboard chamber, shear ram flashboard chamber is in Long Circle in vertical longitudinal cross-section；Steam flooding well special-purpose multifunctional preventer upper strata shear ram structure is also full seal structure, there is shear ram assembly in its shear ram flashboard chamber, shear ram assembly is made up of upper shear ram and down cut flashboard, shear ram has the groove of box structure and shear constitution and the embedding rubber seal of shear ram thereon, the box structure of flashboard is in the outside of flashboard, it is to be risen as high as the banks in " convex " shape, it is made up of inside groove and water jacket, risen as high as the banks in its " convex " shape and laterally pass flashboard, its groove bottom is plane, and the width of its inside groove is more than the width of exterior notch；There is box structure on the outside of upper shear ram, its inner side is shear constitution, it is plane below shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, outer surface below shear constitution with upper shear ram flashboard structure intersects connection, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree below shear constitution, two plane is equal with the angle that shear constitution intersects below, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the upper embedding rubber seal of shear ram is divided into top groove, side groove and lower recess, reverse side below upper shear ram shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively, groove below both sides below is crossed out on below shear constitution；Also there is box structure on the outside of its down cut flashboard, its inner side is shear constitution, there is the groove of embedding rubber seal on down cut flashboard, the box structure of down cut flashboard is in the outside of down cut flashboard, its inner side is shear constitution, it is plane above shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, intersect connection with the outer surface of the shear constitution of down cut flashboard above shear constitution, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree above shear constitution, two plane is equal with the angle that shear constitution intersects above, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the embedding rubber seal of down cut flashboard is divided into top groove, side groove, reverse side above down cut flashboard shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively；The piston of steam flooding well special-purpose multifunctional preventer is divided into shear ram piston and half envelope piston,By piston body,Piston rod and piston tip pin thread are interconnected to constitute,Piston body is cylindrical structure,There are two recessed grooves of annular on the periphery of its cylinder,The center line of its annular recessed groove and the center line of piston body are on the same line,The inner side of piston body is fixedly connected with one end of piston rod,Piston rod is cylindrical rod,The center line of piston rod and the center line of piston body are on the same line,There is hollow circular hole in the centre of piston body and coupled piston rod one end,It is connecting filament rod aperture,The center line and piston rod center line of its circular hole are on the same line,There is screwed tooth structure on the internal perisporium of circular hole,The top of its piston is pin thread structure,Its top is top plane,It pushes up the central axis of plane and piston,The two sides being connected with top plane are plane,Its two side plane is vertical with top plane respectively,And be parallel to each other,The vertical range that it arrives the center line of piston respectively is equal,Fluted structure is connected between side plane and piston rod,Groove open at both ends,Its groove bottom is parallel with side plane,Its two groove side is parallel to each other,And it is vertical with groove bottom,Groove side is parallel with piston top plane,Vertical range between its two sides is equal with the vertical range between two groove sides of the inner side risen as high as the banks in " convex " shape of corresponding box structure,Vertical range between the groove side of outside two risen as high as the banks in box structure is identical with the corresponding vertical range between two groove bottoms of two grooves at the top of pin thread structure,The width of outer side slot side of the width of the groove bottom of its pin thread structure with being risen as high as the banks in corresponding box structure is identical,Pin thread structure outer side slot side is identical with the depth of the groove for the inner side risen as high as the banks in corresponding box structure to the vertical range of top surface；The oil cylinder of its steam flooding well special-purpose multifunctional preventer is divided into two kinds, one kind is half envelope flashboard oil cylinder, one kind is shear ram oil cylinder, oil cylinder is made up of cylinder tube and cylinder head, cylinder head, cylinder tube and side door can be connected in series by connecting bolt, its perisporium of cylinder tube has an oil transportation hole, it is longitudinally penetrated from medial surface to lateral surface, there is an oil circuit hole in cylinder head body, it pierces into cylinder head body from the connected the week side of boss ring surface corresponding with cylinder tube of inner side, and break-through goes out circular inner face in the middle of on the inside of cylinder head；The side door of steam flooding well special-purpose multifunctional preventer is divided into half envelope flashboard side door and shear ram side door, and side door has two oil circuit for penetrating its door jamb holes；There is box structure half envelope flashboard outer end, it is hollow arc-shaped structure in the middle of its inner relative with box structure, the both sides of its hollow arc-shaped structure are respectively medial surface, its two medial surface is at grade, and it is parallel with the groove bottom risen as high as the banks in its box structure, the center center of circle line of hollow arc-shaped structure seals the middle vertical section of flashboard at grade with two sides on parallel or same plane, and with half；There is the round straight hole of sealing before connection on the medial surface of half envelope flashboard, the center line of its round straight hole is vertical with medial surface, top outer surface is fluted with embedded top caulking gum part on half envelope flashboard, top side is reeded side on half envelope flashboard, there is straight hole to pierce into and communicated with round straight hole, the center line of its straight hole and the central axis of round straight hole；The inner connection extended structure of half envelope flashboard is sealed into before half envelope flashboard, it is rubber parts, arcuate structure in the middle of its outside to protrude, its both sides is medial plane, its two medial plane is at grade, it is recessed interior hollow semicircular structure in the middle of its inner side, its both sides is inner side plane, its two inner side plane is at grade, and its plane is parallel with medial plane, circle center line and the center line of outer arcuate structure of empty semicircular structure are parallel to each other in it, plane where it is vertical with interior lateral surface, and with the vertical section of the intermediate symmetry of preceding sealing at grade, there is round straight-bar on its lateral surface, it is outwards fluted that it justifies straight-bar top, its two circles straight-bar is parallel to each other, the distance of the vertical section for the intermediate symmetry that its center line is sealed before arriving respectively is equal, the place plane of its two center line is parallel with the middle cross section of preceding sealing, the diameter that it justifies straight-bar is identical with the diameter of the round straight hole of half envelope flashboard, its length is less than or equal to the depth of its round straight hole；The internal diameter of its shear ram cylinder tube is more than half internal diameter for sealing flashboard cylinder tube,The external diameter of shear ram piston body is equal with the internal diameter of shear ram cylinder tube,The external diameter of half envelope ram piston body is identical with the internal diameter of half envelope cylinder tube,The external diameter of shear ram piston body is naturally also greater than the external diameter of half envelope piston body,The external diameter of shear ram piston body is more than 260mm,The internal diameter of same shear ram oil cylinder is more than 260mm,So,By each part of steam flooding well special-purpose multifunctional preventer,Connection is installed,Shear ram piston rod is put in shearing side door interstitial hole,Rubber seal is installed on shear ram,The box structure of shear ram is connected with the pin thread structure of shear ram piston,Its shear ram is set to be installed into housing shear ram chamber,Shear ram side door is fixedly connected with the casing by screw,Shear ram cylinder tube is inserted on shear ram piston body week again,Cylinder tube is connected with side door,Screw mandrel one end is connected in the middle of piston body in circular hole by thread,Its other end is pierced into the middle circular hole of cylinder head,Its cylinder head is connected with cylinder tube,Then with bolt by cylinder head,Cylinder tube and side door series winding are fixedly connected,Equally first preceding sealing and top are seal-installed on half envelope flashboard,Piston rod is put in half envelope flashboard side door interstitial hole,Side door is screwed on housing,The box structure of half envelope flashboard is set to be connected with the pin thread structure of half envelope ram piston,Half envelope flashboard and top land are installed into half envelope flashboard chamber,Half envelope oil cylinder head is inserted on the piston body periphery of half envelope piston,Screw mandrel one end is connected in the middle of piston body in circular hole by thread,Its other end is pierced into the middle circular hole of cylinder head,Flashboard connecting bolt is sealed by side door with half,Cylinder tube is connected with cylinder head and is fixedly connected,Its side door and piston rod,Cylinder tube and side door,Cylinder tube and cylinder head,There is rubber seal connection between cylinder head and screw mandrel respectively,Make to be tightly connected between its each part；Each oil circuit hole of steam flooding well special-purpose multifunctional preventer is each independent, its shear ram side door oilhole has two, it is that control shear ram closes oil circuit hole and control shear ram opens oil circuit hole respectively, its half envelope flashboard side door oilhole also has two, it closes half Fengkai oil circuit of oil circuit and control for the envelope of control half, there are four oil circuit holes in housing wall, two, its upper strata, lower floor two, upper strata opens oil circuit hole for shearing and oil circuit hole is closed in shearing, lower floor is half Fengkai oil circuit hole, half envelope closes oil circuit hole, its each oil circuit hole is each independent, its oil circuit hole collar extension is located on the outside of outer casing frontispiece, internal orifice is respectively two, it is located at the outside for the one side that shell connects with side door respectively, and internal diameter is equal with the intraoral footpath of side door oil circuit, the specification of its same connected oil circuit mouthful of the corresponding connected side door of each oil circuit inn difference and position are corresponding, the port connection that each oil circuit collar extension of its shell is respectively fixedly connected with, i.e. it connects shearing and opens port connection respectively, port connection is closed in shearing, half Fengkai port connection, half envelope closes port connection；There is an oil circuit in cylinder head wall, one hydraulic fluid port connects with cylinder tube hydraulic fluid port, and another hydraulic fluid port leads in cylinder barrel；Cylinder head has shear ram cylinder head and half envelope flashboard cylinder head, and its half envelope cylinder head oilhole is passed through half envelope cylinder barrel, and its shear ram cylinder head oilhole is passed through the oily cylinder of shear ram；It is complete that its each part successively installs connection according to program respectively, its steam flooding well special-purpose multifunctional preventer four separate complete oil circuits of formation, the shearing of its upper strata, which is opened oil circuit and sheared by shell, opens two internal orifices of oil circuit and connects two side door oil circuits respectively, this side door oil circuit mouthful is directly open to oily cylinder, shearing closes oil circuit and connects side door oil circuit respectively by two internal orifices of shell shearing pass oil circuit, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder, its Fengkai oil circuit of lower floor half connects two side door oil circuits respectively by two internal orifices of the Fengkai oil circuit of shell half, this side door oil circuit mouthful is directly open to oily cylinder, two internal orifices that half envelope pass oil circuit closes oil circuit by the envelope of shell half connect side door oil circuit respectively, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder；There is rubber seal connection between its each oil circuit interface, make tight seal between each oil circuit, shell, side door, cylinder barrel, there is sealing ring connection between each part of cylinder head, make its tight seal, its half Fengkai port connection, half envelope closes port connection, port connection is opened in shearing, shearing is closed port connection and is connected respectively one of bend pipe, its bend pipe other end connects one of high-pressure oil pipe by oily nonyl, the other end of its high-pressure oil pipe is fastened on by oily nonyl on the corresponding hydraulic fluid port of steam flooding well special-purpose multifunctional blowout preventing control apparatus, its bend pipe, port connection, oily nonyl, high-pressure oil pipe, tight seal connection is between each part that control device is imported and exported；And all seals and high-pressure oil pipe of steam flooding well special-purpose multifunctional preventer are high temperature resistant material and are made；Side door is connected by side door bolt with housing in itself, cylinder cap is cylinder head, steam flooding well special-purpose multifunctional preventer switch flashboard fluid cylinder i.e. cylinder tube, it is fixed together by fluid cylinder connecting bolt and side door, shear ram flashboard assembly, half envelope flashboard flashboard assembly are hung in shearing switch flashboard liquid cylinder piston bar, half envelope flashboard switch flashboard liquid cylinder piston bar front end, and two way seal is realized using y-shaped ring between side door and switch flashboard fluid cylinder；Sealing device between piston rod and side door is divided into two parts, a part is sealing well pressure, a part is to seal the oil pressure that hydraulic control is produced, sealing mechanism is located between this two department twice, generally, to make the sealing at this very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, when hydraulic control system hydraulic oil, which enters left and right fluid cylinder flashboard, closes chamber, piston driving or so flashboard assembly is promoted to be moved respectively to well head center along housing flashboard chamber, realize shut-in well, when high pressure oil wells, which enter left and right fluid cylinder flashboard, opens chamber, piston driving or so flashboard assembly is promoted to be moved to well head center position is left, open well head, flashboard switch is controlled by hydraulic control system reversal valve；When closing shear ram flashboard, it by sealing everywhere, well head can so be effectively sealed against, that is flashboard top sealing is tightly connected with housing, before flashboard sealing with pipe and preceding sealing being tightly connected each other, being tightly connected between housing and side door, being tightly connected between piston rod and side door, the sealing of flashboard is such, one is that packing unit crimp sealing is anterior before hydraulic oil effect lower piston rod promotes flashboard, push up between packing unit and housing at the top of interference compression seal, so as to realize initial sealing, two be when having pressure in well, well pressure seals further crimp before flashboard pushed aft flashboard, well pressure promotes flashboard floating to be adjacent to the sealing surface on housing from bottom simultaneously, so as to form reliable sealing；Flashboard assembly has certain gap with flashboard room, flashboard is allowed to be fluctuated in housing chamber, in order to ensure flashboard and well inner tube intercolumniation sealed reliable, there is mutually prominent guide pad the front end of flashboard, it can be inserted into the groove of opposite flashboard, so guide pad inclined-plane produces certain centripetal thrust force in the case that tubing string is not placed in the middle in well in closing well to well casing, tubing string in well is shifted to well head center；Steam flooding well special-purpose multifunctional preventer is to drive double disc Multifunctional blowout preventer control device to be connected by high pressure line and steam, implemented to switch control to steam double disc Multifunctional blowout preventer by steam flooding well special-purpose multifunctional blowout preventing control apparatus, its steam drives Multifunctional blowout preventer control device to connect preventer by high-pressure oil pipe, and control preventer is applied by the hydraulic oil in its high-pressure oil pipe；Steam flooding well special-purpose multifunctional control system of ground preventer is made up of base, fuel tank, pump group, accumulator group, manifold, various valve members, instrument and electric cabinet, its major function is, high voltage control liquid is produced by pump group, and be stored in accumulator group, when needing open and close preventer, the high voltage control liquid from accumulator group is assigned in each control object (preventer) by the 3-position 4-way rotary valve of manifold；Its pump group is equipped with two sets of independent power sources, that is electric oil pump and hand oil pump, it is standby that accumulator group has enough highly pressurised liquids to store, meet the control requirement that steam off drives well special-purpose multifunctional preventer and opens the requirement of hydraulic operated valve, electric oil pump is controlled with automatic, the control device stopped, the open and close action of each preventer by corresponding 3-position 4-way rotary valve；There is standby pressure source interface on the control manifold of remote console, pressure source can be introduced as needed within, hydraulic line has two kinds of hard tube line and soft pipeline, the two ends of its soft pipeline are the snap joint of self-sealing, realize the connection of remote console and steam flooding well special-purpose multifunctional preventer, warning device is installed on remote console, to energy storage pressure, bleed pressure, the operating of oil tank liquid level and electrodynamic pump is monitored, when alarm limit of the above-mentioned parameter beyond setting, it can be spoken on remote console, visual alarm, indicate that operating personnel take measures, it can be in the low alarm of energy storage pressure, the low alarm of oil tank liquid level and electric oil pump operate abnormal alarm；Electric cabinet is fixed on remote console, the electronic motivation of connection remote control is installed in the electric line of electric cabinet, motor connects oil pump, when the electro-motor is turning, oil pump is driven to rotate, by entering oil pipe, by the oil suction in fuel tank, and be forced through flowline and be transported in accumulator group, enter oil pipe one end to be fastened on fuel tank, the other end is fastened on oil pump oil inlet, flowline one end is fixedly connected on the oil-out of oil pump, the other end connects check valve inlet, one-way valved outlet connected pipes one end；It connects oil pipe other end connection accumulator group, and so when oil pump is rotated, pressure oil is through check valve to accumulator group fuel feeding；Connection pressure controller is installed on electric cabinet, when system pressure reaches certain setting value, pressure controller automatically cuts off power supply, make electric oil pump fuel cut-off, when system pressure is depressured certain value, electric oil pump can reset automatically work, the pressure of accumulator group is so set to remain in certain scope, it is available for operation preventer to be turned on and off at any time, accumulator group installs isolating valve by oil pipe connection, overflow valve, reconnect control manifold, its manifold is connected to the import of 3-position 4-way rotary valve, corresponded to respectively on each oil circuit of its control device and the connection control full sealing switch reversal valve of preventer is installed, control preventer suspension switch reversal valve, control the reversal valve of preventer locking switch, as long as it pulls corresponding 3-position 4-way rotary valve handle, make "ON" can be achieved, the operation of "Off" preventer, so, the pressure oil being stored in accumulator group passes through accumulator isolation valve, oil filter, again after decompression overflow valve decompression, into control manifold, to each 3-position 4-way rotary valve oil inlet, 3-position 4-way rotary valve (liquid rotary valve) used on remote console is " O " type function, rotate valve handle " in " position when, each chamber is not communicated with, and when handle is in "ON" position formula "Off" position, as pressure oil enters one end of oil cylinder in preventer, the fluid of the other end makes through 3-position 4-way rotary valve oil return box；Accumulator group is the structure that multiple bladder type hydropneumatic accumulators interconnect, bladder type hydropneumatic accumulator plays storage energy in hydraulic system, steady pressure, reduce power consumption, compensation leakage is oozed, a variety of effects such as absorption pressure pulsating force and mitigation impulsive force, it is supported on the bracket of remote console securely, it is by shell, capsule and charge valve and hydraulic fluid port composition, body has charge valve on top, capsule in charge valve connection shell cavity, there is hydraulic fluid port shell lower end, in hydraulic fluid port insertion shell, insufflation gas in its capsule, usually nitrogen, composition accumulator group is combined in several bladder type hydropneumatic accumulator connections, its intracapsular nitrogen has certain pressure, when hydraulic oil is entered in shell by hydraulic fluid port, compress capsule, the air pressure of the nitrogen in capsule is set to increase, the pressure of its hydraulic oil rises to certain amplitude, conversely when using accumulator, due to the hydraulic oil in the High Voltage compressing shell in capsule, carrying oil necessarily has pressure, can by hydraulic fluid port outwardly against, pressure oil is transported to certain position by oil pipe, and electric oil pump is started working, its pressure oil is set to remain certain pressure, so as to control steam flooding well special-purpose multifunctional preventer；And the oil circuit of steam flooding well special-purpose multifunctional preventer is connected by high-pressure oil pipe with the oil circuit corresponding with its steam flooding well special-purpose multifunctional preventer in the ground control unit of steam flooding well special-purpose multifunctional preventer, half Fengkai of connection control is respectively mounted on each oil circuit in the control cabinet of steam flooding well special-purpose multifunctional preventer ground control unit, partly envelope closes the reversal valve of oil circuit and the reversal valve of oil circuit is driven in control shearing pass, shearing；The upper strata shear ram structure of so steam flooding well special-purpose multifunctional preventer is to realize the function of shearing instlated tubular,Lower floor half seals flashboard structure and just realizes half envelope function,When well head plays lowering-in operation,Scene need to realize half sealing pipe column,When sealing the annular space between tubing string and well,The reversal valve that the control of steam flooding well special-purpose multifunctional blowout preventing control apparatus half is sealed into " switch " action is pulled to off-position,Then hydraulic oil seals "Off" interface into lower floor's oil cylinder closing chamber from steam flooding well special-purpose multifunctional preventer half,Left and right piston is promoted to be moved to well head center together with half envelope flashboard assembly,So as to half shut-in well mouth,Mutually half envelope is opened on the contrary,The reversal valve of envelope " switch " action of its steam flooding well special-purpose multifunctional blowout preventing control apparatus control half is pulled to "ON" position,The interface that then hydraulic oil seals "ON" from steam flooding well special-purpose multifunctional preventer half enters lower floor's oil cylinder and opens chamber,Left and right piston is promoted to be moved together with half envelope flashboard assembly to the direction for removing well head center,So as to open half envelope,And when instlated tubular to be sheared,The by-passing valve of steam flooding well special-purpose multifunctional blowout preventing control apparatus oil circuit control is opened,Due to opening by-passing valve,It is set to depressurize overflow valve short circuit,Just make oil circuit open circuit,The pressure of its oil circuit is just raised,To meet the pressure of shearing instlated tubular,The reversal valve of shear action is pulled to off-position,Then hydraulic oil enters upper strata oil cylinder closing chamber from steam flooding well special-purpose multifunctional preventer shearing "Off" interface,Left and right piston is promoted to be moved together with left and right shear ram assembly to well head center,Because the internal diameter of its piston for shearing piston is more than 260mm,Along with due to opening by-passing valve its hydraulic pressure rise,The thrust that its left and right hydraulic pressure is produced just shears disconnected instlated tubular enough,This just shears disconnected instlated tubular and mouth of shunting in a well entirely,And when opening shear ram and sealing entirely,Steam flooding well special-purpose multifunctional blowout preventing control apparatus need to only be controlled the reversal valve of shear action to pull to "ON" position,Then hydraulic oil is opened interface from steam flooding well special-purpose multifunctional preventer and moved into upper strata unlatching chamber promotion left and right piston together with left and right shear ram assembly to the direction for leaving well head center,So as to realize opening shear ram,Steam flooding well special-purpose multifunctional preventer so is installed on into steam to drive on well head,Instlated tubular can not only be sheared,Realize full envelope,And can also half envelope,Multi-functional and high temperature resistant,So as to reach the purpose of the present invention.

Due to using above-mentioned technical proposal, steam flooding well special-purpose multifunctional preventer can be installed and connected in steam and drive on well head, can shear instlated tubular and realize full envelope, also have half envelope function, and high temperature resistant.

Brief description of the drawings

Well special-purpose multifunctional preventer is driven with reference to embodiment to this bleed steam to be described further：

Accompanying drawing 1 is that steam flooding well special-purpose multifunctional preventer rip cutting of the present invention dissects structural representation

Accompanying drawing 2 is the crosscutting anatomy structural representation of steam flooding well special-purpose multifunctional preventer of the present invention

Accompanying drawing 3 is the piston structure schematic diagram of steam flooding well special-purpose multifunctional preventer of the present invention

Accompanying drawing 4 is positive structure schematic on the outside of steam flooding well special-purpose multifunctional preventer of the present invention

Accompanying drawing 5 dissects structural representation for the shear ram assembly rip cutting of steam flooding well special-purpose multifunctional preventer of the present invention

In figure：1, shear ram cylinder head 2, shear ram cylinder head coupling nut 3, shear ram cylinder head connecting bolt 4, shear ram locks screw mandrel 5, wearing piece 6, shear ram cylinder tube 7, shear ram piston 8, shear ram side door 9, housing 10, down cut flashboard 11, shear ram sealing strip 12, shear ram top sealing 13, shear ram side seal 14, upper shear ram 15, shear ram side door bolt 16, half envelope cylinder head 17, half sealing wire bar 18, half envelope cylinder head coupling nut 19, half envelope cylinder head connecting bolt 20, half envelope flashboard body 21, 22 are sealed before half envelope flashboard, half envelope flashboard top sealing 23, half envelope piston 24, half envelope side door 25, half envelope side door bolt 26, half envelope cylinder tube 27, half envelope closes port connection 28, half Fengkai port connection 29, port connection 30 is closed in shearing, port connection 31 is opened in shearing, piston body 32, piston rod 33, piston tip 34, half envelope flashboard cylinder head oilhole 35, half envelope flashboard side door oilhole 36, shear ram cylinder head oilhole 37, shear ram side door oilhole

Embodiment

In figure：Steam flooding well special-purpose multifunctional preventer is interconnected to constitute with steam flooding well special-purpose multifunctional preventer ground control unit, for opening for steam flooding well mouthful operation, closing well mouthful, shear the blowout hookup of instlated tubular, steam flooding well special-purpose multifunctional preventer is to be connected by remote control i.e. control system of ground preventer by high pressure line with preventer, the on and off and shearing instlated tubular of control preventer are applied by pressure oil by remote control, steam flooding well special-purpose multifunctional preventer is double ram type preventer structure, its center is main latus rectum structure, and left, each internal structure of right structure on two sides, specification is identical, is corresponded between each part of left side structure and each part of right side structure, its corresponding component shape, size, specification is identical, and left side structure is relatively symmetrically connected with right side structure with main latus rectum structure, and steam flooding well special-purpose multifunctional preventer is by housing (9), port connection, shear ram cylinder head (1), shear ram cylinder tube (6), shear ram side door (8), shear ram, shear ram side seal (13), shear ram top seals (12), shear ram piston (7), shear ram flashboard locking screw mandrel (4), oil cylinder nut, half oil sealing cylinder bolt (19), half envelope piston assembly, half envelope flashboard (20), half envelope flashboard top sealing (22), (21) are sealed before half envelope flashboard, shear ram control cylinder bolt (3), side door bolt, half envelope cylinder tube (26), half sealing wire bar (17), half envelope oil cylinder head (16) etc. is constituted；Upper strata is shear ram flashboard structure, and lower floor is half seal structure；There is half envelope flashboard chamber in its lower floor, and built-in half seals flashboard, and there are shear ram flashboard chamber, built-in shear ram in upper strata；Its upper strata is shear ram structure, it is mainly made up of housing layer shell flashboard chamber switch valve plate hydraulic cylinder assembly, shear ram flashboard assembly, manual locking screw mandrel, oil inlet and oil return mouthful, the upper strata left and right sides of housing to be had respectively communicated with the main latus rectum of casing center and the main latus rectum arranged on left and right sides of the heart wherein, symmetrical shape and structure specification identical shear ram flashboard chamber, shear ram flashboard chamber is in Long Circle in vertical longitudinal cross-section；Steam flooding well special-purpose multifunctional preventer upper strata shear ram structure is also full seal structure, there is shear ram assembly in its shear ram flashboard chamber, shear ram assembly is made up of upper shear ram (14) and down cut flashboard (10), shear ram has the groove of box structure and shear constitution and the embedding rubber seal of shear ram thereon, the box structure of flashboard is in the outside of flashboard, it is to be risen as high as the banks in " convex " shape, it is made up of inside groove and water jacket, risen as high as the banks in its " convex " shape and laterally pass flashboard, its groove bottom is plane, the width of its inside groove is more than the width of exterior notch；There is box structure on the outside of upper shear ram, its inner side is shear constitution, it is plane below shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, outer surface below shear constitution with upper shear ram flashboard structure intersects connection, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree below shear constitution, two plane is equal with the angle that shear constitution intersects below, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the upper embedding rubber seal of shear ram is divided into top groove, side groove and lower recess, reverse side below upper shear ram shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively, groove below both sides below is crossed out on below shear constitution；Also there is box structure on the outside of its down cut flashboard, its inner side is shear constitution, there is the groove of embedding rubber seal on down cut flashboard, the box structure of down cut flashboard is in the outside of down cut flashboard, its inner side is shear constitution, it is plane above shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, intersect connection with the outer surface of the shear constitution of down cut flashboard above shear constitution, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree above shear constitution, two plane is equal with the angle that shear constitution intersects above, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the embedding rubber seal of down cut flashboard is divided into top groove, side groove, reverse side above down cut flashboard shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively；The piston (23) of steam flooding well special-purpose multifunctional preventer is divided into shear ram piston and half envelope piston,By piston body (31),Piston rod (32) and piston tip (33) pin thread are interconnected to constitute,Piston body is cylindrical structure,There are two recessed grooves of annular on the periphery of its cylinder,The center line of its annular recessed groove and the center line of piston body are on the same line,The inner side of piston body is fixedly connected with one end of piston rod,Piston rod is cylindrical rod,The center line of piston rod and the center line of piston body are on the same line,There is hollow circular hole in the centre of piston body and coupled piston rod one end,It is connecting filament rod aperture,The center line and piston rod center line of its circular hole are on the same line,There is screwed tooth structure on the internal perisporium of circular hole,The top of its piston is pin thread structure,Its top is top plane,It pushes up the central axis of plane and piston,The two sides being connected with top plane are plane,Its two side plane is vertical with top plane respectively,And be parallel to each other,The vertical range that it arrives the center line of piston respectively is equal,Fluted structure is connected between side plane and piston rod,Groove open at both ends,Its groove bottom is parallel with side plane,Its two groove side is parallel to each other,And it is vertical with groove bottom,Groove side is parallel with piston top plane,Vertical range between its two sides is equal with the vertical range between two groove sides of the inner side risen as high as the banks in " convex " shape of corresponding box structure,Vertical range between the groove side of outside two risen as high as the banks in box structure is identical with the corresponding vertical range between two groove bottoms of two grooves at the top of pin thread structure,The width of outer side slot side of the width of the groove bottom of its pin thread structure with being risen as high as the banks in corresponding box structure is identical,Pin thread structure outer side slot side is identical with the depth of the groove for the inner side risen as high as the banks in corresponding box structure to the vertical range of top surface；The oil cylinder of its steam flooding well special-purpose multifunctional preventer is divided into two kinds, one kind is half envelope flashboard oil cylinder, one kind is shear ram oil cylinder, oil cylinder is made up of cylinder tube and cylinder head, cylinder head, cylinder tube and side door can be connected in series by connecting bolt, its perisporium of cylinder tube has an oil transportation hole, it is longitudinally penetrated from medial surface to lateral surface, there is an oil circuit hole in cylinder head body, it pierces into cylinder head body from the connected the week side of boss ring surface corresponding with cylinder tube of inner side, and break-through goes out circular inner face in the middle of on the inside of cylinder head；The side door of steam flooding well special-purpose multifunctional preventer is divided into half envelope flashboard side door (24) and shear ram side door (25), and side door has two oil circuit for penetrating its door jamb holes；There is box structure half envelope flashboard outer end, it is hollow arc-shaped structure in the middle of its inner relative with box structure, the both sides of its hollow arc-shaped structure are respectively medial surface, its two medial surface is at grade, and it is parallel with the groove bottom risen as high as the banks in its box structure, the center center of circle line of hollow arc-shaped structure seals the middle vertical section of flashboard at grade with two sides on parallel or same plane, and with half；There is the round straight hole of sealing before connection on the medial surface of half envelope flashboard, the center line of its round straight hole is vertical with medial surface, top outer surface is fluted with embedded top caulking gum part on half envelope flashboard, top side is reeded side on half envelope flashboard, there is straight hole to pierce into and communicated with round straight hole, the center line of its straight hole and the central axis of round straight hole；Sealing (21) is the half inner connection extended structure for sealing flashboard before half envelope flashboard, for rubber parts, arcuate structure in the middle of its outside to protrude, its both sides is medial plane, its two medial plane is at grade, it is recessed interior hollow semicircular structure in the middle of its inner side, its both sides is inner side plane, its two inner side plane is at grade, and its plane is parallel with medial plane, circle center line and the center line of outer arcuate structure of empty semicircular structure are parallel to each other in it, plane where it is vertical with interior lateral surface, and with the vertical section of the intermediate symmetry of preceding sealing at grade, there is round straight-bar on its lateral surface, it is outwards fluted that it justifies straight-bar top, its two circles straight-bar is parallel to each other, the distance of the vertical section for the intermediate symmetry that its center line is sealed before arriving respectively is equal, the place plane of its two center line is parallel with the middle cross section of preceding sealing, the diameter that it justifies straight-bar is identical with the diameter of the round straight hole of half envelope flashboard, its length is less than or equal to the depth of its round straight hole；The internal diameter of its shear ram cylinder tube is more than half internal diameter for sealing flashboard cylinder tube,The external diameter of shear ram piston body is equal with the internal diameter of shear ram cylinder tube,The external diameter of half envelope ram piston body is identical with the internal diameter of half envelope cylinder tube,The external diameter of shear ram piston body is naturally also greater than the external diameter of half envelope piston body,The external diameter of shear ram piston body is more than 260mm,The internal diameter of same shear ram oil cylinder is more than 260mm,So,By each part of steam flooding well special-purpose multifunctional preventer,Connection is installed,Shear ram piston rod is put in shearing side door interstitial hole,Rubber seal is installed on shear ram,Its shear ram sealing strip (11) is installed in intermediate groove below,The box structure of shear ram is connected with the pin thread structure of shear ram piston,Its shear ram is set to be installed into housing shear ram chamber,Shear ram side door is fixedly connected with the casing by screw,Shear ram cylinder tube is inserted on shear ram piston body week again,Cylinder tube is connected with side door,Screw mandrel one end is connected in the middle of piston body in circular hole by thread,Its other end is pierced into the middle circular hole of cylinder head,Its cylinder head is connected with cylinder tube,Then with bolt by cylinder head,Cylinder tube and side door series winding are fixedly connected,Equally first preceding sealing and top are seal-installed on half envelope flashboard,Piston rod is put in half envelope flashboard side door interstitial hole,Side door is screwed on housing,The box structure of half envelope flashboard is set to be connected with the pin thread structure of half envelope ram piston,Half envelope flashboard and top land are installed into half envelope flashboard chamber,Half envelope oil cylinder head is inserted on the piston body periphery of half envelope piston,Screw mandrel one end is connected in the middle of piston body in circular hole by thread,Its other end is pierced into the middle circular hole of cylinder head,Flashboard connecting bolt (19) is sealed by side door with half,Cylinder tube is connected with cylinder head and is fixedly connected,Its side door and piston rod,Cylinder tube and side door,Cylinder tube and cylinder head,There is rubber seal connection between cylinder head and screw mandrel respectively,Make to be tightly connected between its each part；Each oil circuit hole of steam flooding well special-purpose multifunctional preventer is each independent, its shear ram side door oilhole has two, it is that control shear ram closes oil circuit hole and control shear ram opens oil circuit hole respectively, its half envelope flashboard side door oilhole also has two, it closes half Fengkai oil circuit of oil circuit and control for the envelope of control half, there are four oil circuit holes in housing wall, two, its upper strata, lower floor two, upper strata opens oil circuit hole for shearing and oil circuit hole is closed in shearing, lower floor is half Fengkai oil circuit hole, half envelope closes oil circuit hole, its each oil circuit hole is each independent, its oil circuit hole collar extension is located on the outside of outer casing frontispiece, internal orifice is respectively two, it is located at the outside for the one side that shell connects with side door respectively, and internal diameter is equal with the intraoral footpath of side door oil circuit, the specification of its same connected oil circuit mouthful of the corresponding connected side door of each oil circuit inn difference and position are corresponding, the port connection that each oil circuit collar extension of its shell is respectively fixedly connected with, i.e. it connects shearing and opens port connection (30) respectively, port connection (29) is closed in shearing, half Fengkai port connection (27), half envelope closes port connection (28)；There is an oil circuit in cylinder head wall, one hydraulic fluid port connects with cylinder tube hydraulic fluid port, and another hydraulic fluid port leads in cylinder barrel；Cylinder head has shear ram cylinder head and half envelope flashboard cylinder head, and its half envelope cylinder head oilhole (34) is passed through half envelope cylinder barrel, and its shear ram cylinder head oilhole (36) is passed through the oily cylinder of shear ram；It is complete that its each part successively installs connection according to program respectively, its steam flooding well special-purpose multifunctional preventer four separate complete oil circuits of formation, the shearing of its upper strata, which is opened oil circuit and sheared by shell, opens two internal orifices of oil circuit and connects two side door oil circuits respectively, this side door oil circuit mouthful is directly open to oily cylinder, shearing closes oil circuit and connects side door oil circuit (37) respectively by two internal orifices of shell shearing pass oil circuit, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder, its Fengkai oil circuit of lower floor half connects two side door oil circuits (35) respectively by two internal orifices of the Fengkai oil circuit of shell half, this side door oil circuit mouthful is directly open to oily cylinder, two internal orifices that half envelope pass oil circuit closes oil circuit by the envelope of shell half connect side door oil circuit respectively, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder；There is rubber seal connection between its each oil circuit interface, make tight seal between each oil circuit, shell, side door, cylinder barrel, there is sealing ring connection between each part of cylinder head, make its tight seal, its half Fengkai port connection, half envelope closes port connection, port connection is opened in shearing, shearing is closed port connection and is connected respectively one of bend pipe, its bend pipe other end connects one of high-pressure oil pipe by oily nonyl, the other end of its high-pressure oil pipe is fastened on by oily nonyl on the corresponding hydraulic fluid port of steam flooding well special-purpose multifunctional blowout preventing control apparatus, its bend pipe, port connection, oily nonyl, high-pressure oil pipe, tight seal connection is between each part that control device is imported and exported；And all seals and high-pressure oil pipe of steam flooding well special-purpose multifunctional preventer are high temperature resistant material and are made；Side door is connected by side door bolt with housing in itself, cylinder cap is cylinder head, steam flooding well special-purpose multifunctional preventer switch flashboard fluid cylinder i.e. cylinder tube, it is fixed together by fluid cylinder connecting bolt and side door, shear ram flashboard assembly hangs over switch flashboard liquid cylinder piston bar front end, and two way seal is realized using y-shaped ring between side door and switch flashboard fluid cylinder；Sealing device between piston rod and side door is divided into two parts, a part is sealing well pressure, a part is to seal the oil pressure that hydraulic control is produced, sealing mechanism is located between this two department twice, generally, to make the sealing at this very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, when hydraulic control system hydraulic oil, which enters left and right fluid cylinder flashboard, closes chamber, piston driving or so flashboard assembly is promoted to be moved respectively to well head center along housing flashboard chamber, realize shut-in well, when high pressure oil wells, which enter left and right fluid cylinder flashboard, opens chamber, piston driving or so flashboard assembly is promoted to be moved to well head center position is left, open well head, flashboard switch is controlled by hydraulic control system reversal valve；When closing shear ram flashboard, it by sealing everywhere, well head can so be effectively sealed against, that is flashboard top sealing is tightly connected with housing, before flashboard sealing with pipe and preceding sealing being tightly connected each other, being tightly connected between housing and side door, being tightly connected between piston rod and side door, the sealing of flashboard is such, one is that packing unit crimp sealing is anterior before hydraulic oil effect lower piston rod promotes flashboard, push up between packing unit and housing at the top of interference compression seal, so as to realize initial sealing, two be when having pressure in well, well pressure seals further crimp before flashboard pushed aft flashboard, well pressure promotes flashboard floating to be adjacent to the sealing surface on housing from bottom simultaneously, so as to form reliable sealing；Flashboard assembly has certain gap with flashboard room, flashboard is allowed to be fluctuated in housing chamber, in order to ensure flashboard and well inner tube intercolumniation sealed reliable, there is mutually prominent guide pad the front end of flashboard, it can be inserted into the groove of opposite flashboard, so guide pad inclined-plane produces certain centripetal thrust force in the case that tubing string is not placed in the middle in well in closing well to well casing, tubing string in well is shifted to well head center；Steam flooding well special-purpose multifunctional preventer is to drive double disc Multifunctional blowout preventer control device to be connected by high pressure line and steam, implemented to switch control to steam double disc Multifunctional blowout preventer by steam flooding well special-purpose multifunctional blowout preventing control apparatus, its steam drives Multifunctional blowout preventer control device to connect preventer by high-pressure oil pipe, and control preventer is applied by the hydraulic oil in its high-pressure oil pipe；Steam flooding well special-purpose multifunctional blowout preventing control apparatus is made up of base, fuel tank, pump group, accumulator group, manifold, various valve members, instrument and electric cabinet, its major function is, high voltage control liquid is produced by pump group, and be stored in accumulator group, when needing open and close preventer, the high voltage control liquid from accumulator group is assigned in each control object (preventer) by the 3-position 4-way rotary valve of manifold；Its pump group is equipped with two sets of independent power sources, that is electric oil pump and hand oil pump, it is standby that accumulator group has enough highly pressurised liquids to store, meet the control requirement that steam off drives well special-purpose multifunctional preventer and opens the requirement of hydraulic operated valve, electric oil pump is controlled with automatic, the control device stopped, the open and close action of each preventer by corresponding 3-position 4-way rotary valve；There is standby pressure source interface on the control manifold of remote console, pressure source can be introduced as needed within, hydraulic line has two kinds of hard tube line and soft pipeline, the two ends of its soft pipeline are the snap joint of self-sealing, realize the connection of remote console and steam flooding well special-purpose multifunctional preventer, warning device is installed on remote console, to energy storage pressure, bleed pressure, the operating of oil tank liquid level and electrodynamic pump is monitored, when alarm limit of the above-mentioned parameter beyond setting, it can be spoken on remote console, visual alarm, indicate that operating personnel take measures, it can be in the low alarm of energy storage pressure, the low alarm of oil tank liquid level and electric oil pump operate abnormal alarm；Electric cabinet is fixed on remote console, the electronic motivation of connection remote control is installed in the electric line of electric cabinet, motor connects oil pump, when the electro-motor is turning, oil pump is driven to rotate, by entering oil pipe, by the oil suction in fuel tank, and be forced through flowline and be transported in accumulator group, enter oil pipe one end to be fastened on fuel tank, the other end is fastened on oil pump oil inlet, flowline one end is fixedly connected on the oil-out of oil pump, the other end connects check valve inlet, one-way valved outlet connected pipes one end；It connects oil pipe other end connection accumulator group, and so when oil pump is rotated, pressure oil is through check valve to accumulator group fuel feeding；Connection pressure controller is installed on electric cabinet, when system pressure reaches certain setting value, pressure controller automatically cuts off power supply, make electric oil pump fuel cut-off, when system pressure is depressured certain value, electric oil pump can reset automatically work, the pressure of accumulator group is so set to remain in certain scope, it is available for operation preventer to be turned on and off at any time, accumulator group installs isolating valve by oil pipe connection, overflow valve, reconnect control manifold, its manifold is connected to the import of 3-position 4-way rotary valve, corresponded to respectively on each oil circuit of its control device and the connection control full sealing switch reversal valve of preventer is installed, control preventer suspension switch reversal valve, control the reversal valve of preventer locking switch, as long as it pulls corresponding 3-position 4-way rotary valve handle, make "ON" can be achieved, the operation of "Off" preventer, so, the pressure oil being stored in accumulator group passes through accumulator isolation valve, oil filter, again after decompression overflow valve decompression, into control manifold, to each 3-position 4-way rotary valve oil inlet, 3-position 4-way rotary valve (liquid rotary valve) used on remote console is " O " type function, rotate valve handle " in " position when, each chamber is not communicated with, and when handle is in "ON" position formula "Off" position, as pressure oil enters one end of oil cylinder in preventer, the fluid of the other end makes through 3-position 4-way rotary valve oil return box；Accumulator group is the structure that multiple bladder type hydropneumatic accumulators interconnect, bladder type hydropneumatic accumulator plays storage energy in hydraulic system, steady pressure, reduce power consumption, compensation leakage is oozed, a variety of effects such as absorption pressure pulsating force and mitigation impulsive force, it is supported on the bracket of remote console securely, it is by shell, capsule and charge valve and hydraulic fluid port composition, body has charge valve on top, capsule in charge valve connection shell cavity, there is hydraulic fluid port shell lower end, in hydraulic fluid port insertion shell, insufflation gas in its capsule, usually nitrogen, composition accumulator group is combined in several bladder type hydropneumatic accumulator connections, its intracapsular nitrogen has certain pressure, when hydraulic oil is entered in shell by hydraulic fluid port, compress capsule, the air pressure of the nitrogen in capsule is set to increase, the pressure of its hydraulic oil rises to certain amplitude, conversely when using accumulator, due to the hydraulic oil in the High Voltage compressing shell in capsule, carrying oil necessarily has pressure, can by hydraulic fluid port outwardly against, pressure oil is transported to certain position by oil pipe, and electric oil pump is started working, its pressure oil is set to remain certain pressure, so as to control steam flooding well special-purpose multifunctional preventer；And the oil circuit of steam flooding well special-purpose multifunctional preventer is connected by high-pressure oil pipe with the oil circuit corresponding with its steam flooding well special-purpose multifunctional preventer in the ground control unit of steam flooding well special-purpose multifunctional preventer, half Fengkai of connection control is respectively mounted on each oil circuit in the control cabinet of steam flooding well special-purpose multifunctional preventer ground control unit, partly envelope closes the reversal valve of oil circuit and the reversal valve of oil circuit is driven in control shearing pass, shearing.

Claims (3)

1. a kind of steam flooding well special-purpose multifunctional preventer, itself and steam flooding well special-purpose multifunctional preventer ground control unit are connected with each other by high pressure line, the on and off of control preventer is applied by pressure oil by ground control unit, steam flooding well special-purpose multifunctional preventer is double ram type preventer structure, its center is main latus rectum structure, and left, each internal structure of right structure on two sides, specification is identical, is corresponded between each part of left side structure and each part of right side structure, its corresponding component shape, size, specification is identical, and left side structure is relatively symmetrically connected with right side structure with main latus rectum structure, and steam flooding well special-purpose multifunctional preventer is by housing, port connection, shear ram cylinder head, shear ram cylinder tube, shear ram side door, shear ram, shear ram side seal, shear ram top is sealed, shear ram piston, shear ram flashboard locks screw mandrel, oil cylinder nut, half oil sealing cylinder bolt, half envelope piston assembly, half envelope flashboard, half envelope flashboard top sealing, sealed before half envelope flashboard, shear ram control cylinder bolt, side door bolt, half envelope cylinder tube, half sealing wire bar, half envelope oil cylinder head etc. is constituted；Upper strata is shear ram flashboard structure, and lower floor is half seal structure；There is half envelope flashboard chamber in its lower floor, and built-in half seals flashboard, and there are shear ram flashboard chamber, built-in shear ram in upper strata；Its upper strata is shear ram structure, it is mainly made up of housing layer shell flashboard chamber switch valve plate hydraulic cylinder assembly, shear ram flashboard assembly, manual locking screw mandrel, oil inlet and oil return mouthful, the upper strata left and right sides of housing to be had respectively communicated with the main latus rectum of casing center and the main latus rectum arranged on left and right sides of the heart wherein, symmetrical shape and structure specification identical shear ram flashboard chamber, shear ram flashboard chamber is in Long Circle in vertical longitudinal cross-section；Steam flooding well special-purpose multifunctional preventer upper strata shear ram structure is also full seal structure, there is shear ram assembly in its shear ram flashboard chamber, shear ram assembly is made up of upper shear ram and down cut flashboard, shear ram has the groove of box structure and shear constitution and the embedding rubber seal of shear ram thereon, the box structure of flashboard is in the outside of flashboard, it is to be risen as high as the banks in " convex " shape, it is made up of inside groove and water jacket, risen as high as the banks in its " convex " shape and laterally pass flashboard, its groove bottom is plane, and the width of its inside groove is more than the width of exterior notch；There is box structure on the outside of upper shear ram, its inner side is shear constitution, it is plane below shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, outer surface below shear constitution with upper shear ram flashboard structure intersects connection, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree below shear constitution, two plane is equal with the angle that shear constitution intersects below, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the upper embedding rubber seal of shear ram is divided into top groove, side groove and lower recess, reverse side below upper shear ram shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively, groove below both sides below is crossed out on below shear constitution；Also there is box structure on the outside of its down cut flashboard, its inner side is shear constitution, there is the groove of embedding rubber seal on down cut flashboard, the box structure of down cut flashboard is in the outside of down cut flashboard, its inner side is shear constitution, it is plane above shear constitution, its plane is vertical with the groove bottom risen as high as the banks in " convex " shape of box structure, and it is parallel with the middle cross section of its groove bottom or at grade, intersect connection with the outer surface of the shear constitution of down cut flashboard above shear constitution, the outer surface of its shear constitution is two intersecting planes, it intersects at the centre position of shear constitution, and two plane is respectively with intersecting the angle less than 90 degree above shear constitution, two plane is equal with the angle that shear constitution intersects above, angle between its two plane is between 120 degree to 170 degree, angle between its each plane is set according to specific needs, the groove of the embedding rubber seal of down cut flashboard is divided into top groove, side groove, reverse side above down cut flashboard shear constitution is to have top groove in top surface, there is side groove the two sides of shear constitution respectively；The piston of steam flooding well special-purpose multifunctional preventer is divided into shear ram piston and half envelope piston,By piston body,Piston rod and piston tip pin thread are interconnected to constitute,Piston body is cylindrical structure,There are two recessed grooves of annular on the periphery of its cylinder,The center line of its annular recessed groove and the center line of piston body are on the same line,The inner side of piston body is fixedly connected with one end of piston rod,Piston rod is cylindrical rod,The center line of piston rod and the center line of piston body are on the same line,There is hollow circular hole in the centre of piston body and coupled piston rod one end,It is connecting filament rod aperture,The center line and piston rod center line of its circular hole are on the same line,There is screwed tooth structure on the internal perisporium of circular hole,The top of its piston is pin thread structure,Its top is top plane,It pushes up the central axis of plane and piston,The two sides being connected with top plane are plane,Its two side plane is vertical with top plane respectively,And be parallel to each other,The vertical range that it arrives the center line of piston respectively is equal,Fluted structure is connected between side plane and piston rod,Groove open at both ends,Its groove bottom is parallel with side plane,Its two groove side is parallel to each other,And it is vertical with groove bottom,Groove side is parallel with piston top plane,Vertical range between its two sides is equal with the vertical range between two groove sides of the inner side risen as high as the banks in " convex " shape of corresponding box structure,Vertical range between the groove side of outside two risen as high as the banks in box structure is identical with the corresponding vertical range between two groove bottoms of two grooves at the top of pin thread structure,The width of outer side slot side of the width of the groove bottom of its pin thread structure with being risen as high as the banks in corresponding box structure is identical,Pin thread structure outer side slot side is identical with the depth of the groove for the inner side risen as high as the banks in corresponding box structure to the vertical range of top surface；The oil cylinder of its steam flooding well special-purpose multifunctional preventer is divided into two kinds, one kind is half envelope flashboard oil cylinder, one kind is shear ram oil cylinder, oil cylinder is made up of cylinder tube and cylinder head, cylinder head, cylinder tube and side door can be connected in series by connecting bolt, its perisporium of cylinder tube has an oil transportation hole, it is longitudinally penetrated from medial surface to lateral surface, there is an oil circuit hole in cylinder head body, it pierces into cylinder head body from the connected the week side of boss ring surface corresponding with cylinder tube of inner side, and break-through goes out circular inner face in the middle of on the inside of cylinder head；The side door of steam flooding well special-purpose multifunctional preventer is divided into half envelope flashboard side door and shear ram side door, and side door has two oil circuit for penetrating its door jamb holes；There is box structure half envelope flashboard outer end, it is hollow arc-shaped structure in the middle of its inner relative with box structure, the both sides of its hollow arc-shaped structure are respectively medial surface, its two medial surface is at grade, and it is parallel with the groove bottom risen as high as the banks in its box structure, the center center of circle line of hollow arc-shaped structure seals the middle vertical section of flashboard at grade with two sides on parallel or same plane, and with half；There is the round straight hole of sealing before connection on the medial surface of half envelope flashboard, the center line of its round straight hole is vertical with medial surface, top outer surface is fluted with embedded top caulking gum part on half envelope flashboard, top side is reeded side on half envelope flashboard, there is straight hole to pierce into and communicated with round straight hole, the center line of its straight hole and the central axis of round straight hole；The inner connection extended structure of half envelope flashboard is sealed into before half envelope flashboard, for rubber parts, arcuate structure in the middle of its outside to protrude, its both sides is medial plane, its two medial plane is at grade, it is recessed interior hollow semicircular structure in the middle of its inner side, its both sides is inner side plane, its two inner side plane is at grade, and its plane is parallel with medial plane, circle center line and the center line of outer arcuate structure of empty semicircular structure are parallel to each other in it, plane where it is vertical with interior lateral surface, and with the vertical section of the intermediate symmetry of preceding sealing at grade, there is round straight-bar on its lateral surface, it is outwards fluted that it justifies straight-bar top, its two circles straight-bar is parallel to each other, the distance of the vertical section for the intermediate symmetry that its center line is sealed before arriving respectively is equal, the place plane of its two center line is parallel with the middle cross section of preceding sealing, the diameter that it justifies straight-bar is identical with the diameter of the round straight hole of half envelope flashboard, its length is less than or equal to the depth of its round straight hole；By each part of steam flooding well special-purpose multifunctional preventer, connection is installed, shear ram piston rod is put in shearing side door interstitial hole, rubber seal is installed on shear ram, its shear ram sealing strip is installed in intermediate groove below, the box structure of shear ram is connected with the pin thread structure of shear ram piston, its shear ram is set to be installed into housing shear ram chamber, shear ram side door is fixedly connected with the casing by screw, shear ram cylinder tube is inserted on shear ram piston body week again, cylinder tube is connected with side door, screw mandrel one end is connected in the middle of piston body in circular hole by thread, its other end is pierced into the middle circular hole of cylinder head, its cylinder head is connected with cylinder tube, then with bolt by cylinder head, cylinder tube and side door series winding are fixedly connected, equally first preceding sealing and top are seal-installed on half envelope flashboard, piston rod is put in half envelope flashboard side door interstitial hole, side door is screwed on housing, the box structure of half envelope flashboard is set to be connected with the pin thread structure of half envelope ram piston, half envelope flashboard and top land are installed into half envelope flashboard chamber, half envelope oil cylinder head is inserted on the piston body periphery of half envelope piston, screw mandrel one end is connected in the middle of piston body in circular hole by thread, its other end is pierced into the middle circular hole of cylinder head, flashboard connecting bolt is sealed by side door with half, cylinder tube is connected with cylinder head and is fixedly connected, its side door and piston rod, cylinder tube and side door, cylinder tube and cylinder head, there is rubber seal connection between cylinder head and screw mandrel respectively, make to be tightly connected between its each part；Each oil circuit hole of steam flooding well special-purpose multifunctional preventer is each independent, its shear ram side door oilhole has two, it is that control shear ram closes oil circuit hole and control shear ram opens oil circuit hole respectively, its half envelope flashboard side door oilhole also has two, it closes half Fengkai oil circuit of oil circuit and control for the envelope of control half, there are four oil circuit holes in housing wall, two, its upper strata, lower floor two, upper strata opens oil circuit hole for shearing and oil circuit hole is closed in shearing, lower floor is half Fengkai oil circuit hole, half envelope closes oil circuit hole, its each oil circuit hole is each independent, its oil circuit hole collar extension is located on the outside of outer casing frontispiece, internal orifice is respectively two, it is located at the outside for the one side that shell connects with side door respectively, and the corresponding intraoral footpath of side door oil circuit of internal diameter is equal, the specification of its same connected oil circuit mouthful of the corresponding connected side door of each oil circuit inn difference and position are corresponding, the port connection that each oil circuit collar extension of its shell is respectively fixedly connected with, i.e. it connects shearing and opens port connection respectively, port connection is closed in shearing, half Fengkai port connection, half envelope closes port connection；There is an oil circuit in cylinder head wall, one hydraulic fluid port connects with cylinder tube hydraulic fluid port, and another hydraulic fluid port leads in cylinder barrel；Cylinder head has shear ram cylinder head and half envelope flashboard cylinder head, and its half envelope cylinder head oilhole is passed through half envelope cylinder barrel, and its shear ram cylinder head oilhole is passed through the oily cylinder of shear ram；It is complete that its each part successively installs connection according to program respectively, its steam flooding well special-purpose multifunctional preventer four separate complete oil circuits of formation, the shearing of its upper strata, which is opened oil circuit and sheared by shell, opens two internal orifices of oil circuit and connects two side door oil circuits respectively, this side door oil circuit mouthful is directly open to oily cylinder, shearing closes oil circuit and connects side door oil circuit respectively by two internal orifices of shell shearing pass oil circuit, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder, its Fengkai oil circuit of lower floor half connects two side door oil circuits respectively by two internal orifices of the Fengkai oil circuit of shell half, this side door oil circuit mouthful is directly open to oily cylinder, two internal orifices that half envelope pass oil circuit closes oil circuit by the envelope of shell half connect side door oil circuit respectively, this side door oil circuit reconnects oily cylinder oil circuit, oily cylinder oil circuit reconnects cylinder head oil circuit, its cylinder head oil circuit mouthful opening is passed through in oily cylinder；There is rubber seal connection between its each oil circuit interface, make tight seal between each oil circuit, shell, side door, cylinder barrel, there is sealing ring connection between each part of cylinder head, make its tight seal, its half Fengkai port connection, half envelope closes port connection, port connection is opened in shearing, shearing is closed port connection and is connected respectively one of bend pipe, its bend pipe other end connects one of high-pressure oil pipe by oily nonyl, the other end of its high-pressure oil pipe is fastened on by oily nonyl on the corresponding hydraulic fluid port of steam flooding well special-purpose multifunctional blowout preventing control apparatus, its bend pipe, port connection, oily nonyl, high-pressure oil pipe, tight seal connection is between each part that control device is imported and exported；Side door is connected by side door bolt with housing in itself, cylinder cap is cylinder head, steam flooding well special-purpose multifunctional preventer switch flashboard fluid cylinder i.e. cylinder tube, it is fixed together by fluid cylinder connecting bolt and side door, shear ram flashboard assembly, half envelope flashboard flashboard assembly are hung in shearing switch flashboard liquid cylinder piston bar, half envelope flashboard switch flashboard liquid cylinder piston bar front end, and two way seal is realized using y-shaped ring between side door and switch flashboard fluid cylinder；Sealing device between piston rod and side door is divided into two parts, a part is sealing well pressure, a part is to seal the oil pressure that hydraulic control is produced, sealing mechanism has the sealing ring of multiplet between this two department twice, and the auxiliary seal of middle O-ring seals, when hydraulic control system hydraulic oil, which enters left and right fluid cylinder flashboard, closes chamber, piston driving or so flashboard assembly is promoted to be moved respectively to well head center along housing flashboard chamber, realize shut-in well, when high pressure oil wells, which enter left and right fluid cylinder flashboard, opens chamber, piston driving or so flashboard assembly is promoted to be moved to well head center position is left, open well head, flashboard switch is controlled by hydraulic control system reversal valve；When closing shear ram flashboard, it by sealing everywhere, well head can so be effectively sealed against, that is flashboard top sealing is tightly connected with housing, before flashboard sealing with pipe and preceding sealing being tightly connected each other, being tightly connected between housing and side door, being tightly connected between piston rod and side door, the sealing of flashboard is such, one is that packing unit crimp sealing is anterior before hydraulic oil effect lower piston rod promotes flashboard, push up between packing unit and housing at the top of interference compression seal, so as to realize initial sealing, two be when having pressure in well, well pressure seals further crimp before flashboard pushed aft flashboard, well pressure promotes flashboard floating to be adjacent to the sealing surface on housing from bottom simultaneously, so as to form reliable sealing；Flashboard assembly has certain gap with flashboard room, flashboard is allowed to be fluctuated in housing chamber, in order to ensure flashboard and well inner tube intercolumniation sealed reliable, there is mutually prominent guide pad the front end of flashboard, it can be inserted into the groove of opposite flashboard, so guide pad inclined-plane produces certain centripetal thrust force in the case that tubing string is not placed in the middle in well in closing well to well casing, tubing string in well is shifted to well head center；Steam flooding well special-purpose multifunctional preventer is to drive double disc Multifunctional blowout preventer control device to be connected by high pressure line and steam, implemented to switch control to steam double disc Multifunctional blowout preventer by steam flooding well special-purpose multifunctional blowout preventing control apparatus, its steam drives Multifunctional blowout preventer control device to connect preventer by high-pressure oil pipe, and control preventer is applied by the hydraulic oil in its high-pressure oil pipe；Steam flooding well special-purpose multifunctional blowout preventing control apparatus is made up of base, fuel tank, pump group, accumulator group, manifold, various valve members, instrument and electric cabinet, high voltage control liquid is produced by pump group, and be stored in accumulator group, when needing open and close preventer, the high voltage control liquid from accumulator group is assigned in each control object (preventer) by the 3-position 4-way rotary valve of manifold；Its pump group is equipped with two sets of independent power sources, that is electric oil pump and hand oil pump, it is standby that accumulator group has enough highly pressurised liquids to store, meet the control requirement that steam off drives well special-purpose multifunctional preventer and opens the requirement of hydraulic operated valve, electric oil pump is controlled with automatic, the control device stopped, the open and close action of each preventer by corresponding 3-position 4-way rotary valve；There is standby pressure source interface on the control manifold of remote console, pressure source can be introduced as needed within, hydraulic line has two kinds of hard tube line and soft pipeline, the two ends of its soft pipeline are the snap joint of self-sealing, realize the connection of remote console and steam flooding well special-purpose multifunctional preventer, warning device is installed on remote console, to energy storage pressure, bleed pressure, the operating of oil tank liquid level and electrodynamic pump is monitored, when alarm limit of the above-mentioned parameter beyond setting, it can be spoken on remote console, visual alarm, indicate that operating personnel take measures, it can be in the low alarm of energy storage pressure, the low alarm of oil tank liquid level and electric oil pump operate abnormal alarm；Electric cabinet is fixed on remote console, the electronic motivation of connection remote control is installed in the electric line of electric cabinet, motor connects oil pump, when the electro-motor is turning, oil pump is driven to rotate, by entering oil pipe, by the oil suction in fuel tank, and be forced through flowline and be transported in accumulator group, enter oil pipe one end to be fastened on fuel tank, the other end is fastened on oil pump oil inlet, flowline one end is fixedly connected on the oil-out of oil pump, the other end connects check valve inlet, one-way valved outlet connected pipes one end；It connects oil pipe other end connection accumulator group, and so when oil pump is rotated, pressure oil is through check valve to accumulator group fuel feeding；Connection pressure controller is installed on electric cabinet, when system pressure reaches certain setting value, pressure controller automatically cuts off power supply, make electric oil pump fuel cut-off, when system pressure is depressured certain value, electric oil pump can reset automatically work, the pressure of accumulator group is so set to remain in certain scope, it is available for operation preventer to be turned on and off at any time, accumulator group installs isolating valve by oil pipe connection, overflow valve, reconnect control manifold, its manifold is connected to the import of 3-position 4-way rotary valve, corresponded to respectively on each oil circuit of its control device and the connection control full sealing switch reversal valve of preventer is installed, control preventer suspension switch reversal valve, control the reversal valve of preventer locking switch, as long as it pulls corresponding 3-position 4-way rotary valve handle, make "ON" can be achieved, the operation of "Off" preventer, so, the pressure oil being stored in accumulator group passes through accumulator isolation valve, oil filter, again after decompression overflow valve decompression, into control manifold, to each 3-position 4-way rotary valve oil inlet, 3-position 4-way rotary valve (liquid rotary valve) used on remote console is " O " type function, rotate valve handle " in " position when, each chamber is not communicated with, and when handle is in "ON" position formula "Off" position, as pressure oil enters one end of oil cylinder in preventer, the fluid of the other end makes through 3-position 4-way rotary valve oil return box；Accumulator group is the structure that multiple bladder type hydropneumatic accumulators interconnect, bladder type hydropneumatic accumulator plays storage energy in hydraulic system, steady pressure, reduce power consumption, compensation leakage is oozed, a variety of effects such as absorption pressure pulsating force and mitigation impulsive force, it is supported on the bracket of remote console securely, it is by shell, capsule and charge valve and hydraulic fluid port composition, body has charge valve on top, capsule in charge valve connection shell cavity, there is hydraulic fluid port shell lower end, in hydraulic fluid port insertion shell, insufflation gas in its capsule, usually nitrogen, composition accumulator group is combined in several bladder type hydropneumatic accumulator connections, its intracapsular nitrogen has certain pressure, when hydraulic oil is entered in shell by hydraulic fluid port, compress capsule, the air pressure of the nitrogen in capsule is set to increase, the pressure of its hydraulic oil rises to certain amplitude, conversely when using accumulator, due to the hydraulic oil in the High Voltage compressing shell in capsule, carrying oil necessarily has pressure, can by hydraulic fluid port outwardly against, pressure oil is transported to certain position by oil pipe, and electric oil pump is started working, its pressure oil is set to remain certain pressure, so as to control steam flooding well special-purpose multifunctional preventer；And the oil circuit of steam flooding well special-purpose multifunctional preventer is connected by high-pressure oil pipe with the oil circuit corresponding with its steam flooding well special-purpose multifunctional preventer in the ground control unit of steam flooding well special-purpose multifunctional preventer, half Fengkai of connection control is respectively mounted on each oil circuit in the control cabinet of steam flooding well special-purpose multifunctional preventer ground control unit, partly envelope closes the reversal valve of oil circuit and the reversal valve of oil circuit is driven in control shearing pass, shearing；It is characterized in that：Steam flooding well special-purpose multifunctional preventer is the open and close well head for being exclusively used in steam flooding well mouthful operation, the blowout hookup for shearing instlated tubular, the internal diameter of its shear ram cylinder tube is more than half internal diameter for sealing flashboard cylinder tube, the external diameter of shear ram piston body is equal with the internal diameter of shear ram cylinder tube, and it is sufficiently large, reaching makes it in the conventional hydraulic using control device, there is the enough shear force that pushes away, shear instlated tubular, and its well head is sealed entirely.

2. steam flooding well special-purpose multifunctional preventer according to claim 1, it is characterized in that：The external diameter of shear ram piston body is more than 260mm, and the internal diameter of same shear ram oil cylinder is more than 260mm.

3. steam flooding well special-purpose multifunctional preventer according to claim 1, it is characterized in that：All seals and high-pressure oil pipe of steam flooding well special-purpose multifunctional preventer are high temperature resistant material and are made.

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