|Publication number||USRE22180 E|
|Publication date||Sep 22, 1942|
|Filing date||Sep 27, 1937|
|Publication number||US RE22180 E, US RE22180E, US-E-RE22180, USRE22180 E, USRE22180E|
|Inventors||Herbert C. Otis|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
sept.22`,1942. H, C, ons y Re. 22,180
WELL DEVICE Original Filed Sept. 27, 195'? Ressued Sept. 22, 1942 Herbert C. Otis, Dallas, Tex.
Original No. 2,196,535, dated April 9, 1940, Serial No. 165,848, September 27, 1937. Application for reissue April 4, 1941, Serial No. 386,951
This invention relates `to new and useful improvements in well devices.
One object of the invention is to provide an improved device arranged to be lowered into the well tubing and having means for automatically shutting off the flow through the tubing when the velocity of the flow exceeds a predetermined rate.
An important object of the invention is to provide an improved device which may be positioned at any point within a well tubing and having means, which may be automatic, for shutting oi the flow through said tubing; said means being exposed to the well fluid and being arranged to be actuated when the forces created by thev well fluid acting against said means are sufficiently unbalanced to cause movement thereof.
Another object of the invention is to provide an improved device of the character described wherein the Well fluid flows through a iiow passage provided in said device, with a movable valve for controlling the flow through said passage; said valve being so arranged that as long as the velocity of flow of the fluid through the passage is at a normal or predetermined rate the valve remains in an open or inactive position and is arranged to close when the velocity of iiow is A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.
" of the valve which is located at the lower end increased above such normal or predetermined rate.
Still another object of the invention is to provide an improved device having a movable valve element exposed to the Well fluid, and means for restricting the flow of well fluid through the device so that a pressure differential is set up across the element; the element being so constructed that it is actuated by a predetermined pressure differential to shut off iiow through the device.
,A further object of the invention is to provide l a well device of the character described including scribed which may be run into and removed from the'well tubing on a wire line or cable and which may be readily positioned at any point within the tubing or removed therefrom without removing the tubing.
of the device, showing the valve in its,closed position,
Figure 3 is a view, similar to Figure 2, with the releasemeans for equalizing the pressures across the valve engaging said valve,
Figure 4 is a horizontal, cross-sectional view, taken on the line '4--4 of Figure l, and
Figure 5 is a transverse, vertical sectional view of a modified. form ofV valve cage.
In the drawing, the Inumeral ID designates an elongate mandrel having an axial bore`l Ii extending therethrough. The upper portion of the outer surface of the mandrel is substantially cylindrical and a slip supporting sleeve I3 is slidable longitudinally on this portion. The sleeve is formed with an outwardly directed, annular flange i4r at its upper end and an external vcollar i5 is preferably made integral with its lower end. The collar has a plurality of radial slots i6 therein, which slots are spaced equidistant therearound and the upper ends of gripping elements il are inserted within the slots. A retaining'rin'g i8 which surrounds the collar prevents outward displacement of the elements from said slots. Manifestly, the gripping elements are suspended from the sleeve i 3 and are movable with relation to the mandrel. For limiting the movement of the sleeve on the mandrel the latter is formed with an external flange I9, preferably integral therewith. As clearly shown in Figure 1, this flange is slotted to permit the gripping elements I1 to extend therethrough. A confining ring 20 surrounds the flange and confines the elements within the slots of said flange, whereby the gripping elements are retained in close proximity to the outer surface of the mandrel. l
Immediately below the flange I9, the surface of the mandrel is flared or inclined outwardly to form a slip expanding portion 2 I. element I1 includes an arcuate slip 22 at its lower end and the inner surfaces of the slips engage and Each gripping ride upon the inclined surface 2| ofthe mandrel.I The outer surface of each slip is 4formed with gripping teeth 23 which are adapted to engage the inner wall of the well tubing A to vprevent upward displacement or movement of the slips and mandrel. When the slips 22 are at the upper end of the inclined portion 2| and immediately below the flange i9 they are retracted and out of engagement with the tubing wall; however, movement of the slips downwardly with relation to the mandrel ID causes the outward radial movement thereof to the position shown in Figure 1, wh'ereby said slips engage the tubing wall to hold the mandrel in position.
Below Ithe slip-expanding or inclined surface 2| the mandrel is formed with a reduced shank 24,
whereby an external annular shoulder 25 is provided. A plurality of elastic packing cups 25 surround the shank, being spaced from each other by suitable spacing collars or rings 2-1. The uppermost cup abuts the shoulder 25 and the cups and spacers are retained on the shank by a tubular valve cage or,` housing 28 which is threaded onto the lowerend of the shank. Normally, there is a clearance between the cups and wall of the tubing but when the device is set within said tubing, as will be explained, the well fluid pressure below the. device acts upwardly against the packing cups to deform the same into sealing vengagement with the wall of the well tubing, whereby the annular space between the well tubing and the mandrel is-sealed off. g
The bore 29 of the valve cage 23 is reduced at its lower portion as shown at 30, whereby an in-` ternal annular shoulder 3| is formed within the cage. An inwardly directed flange 32 is preferably made integral with the cage and is located at the extreme lower end of the same, the axial opening or hole formed by the flange establishing communication between the area outside the body and the lower end of the bore of said body. Above the shoulder 3| a plurality of elongate vertical slots or openings 33 extend through the wall of the cage and establish communication between the well tubing A- and the bore of the valve cage. 'I'he slots are preferably of a suflicient cross-sectional area to permit an unrestricted flow through the mandrel; however, if desired, they may be reduced in area to restrict the flow to a predetermined rate. The size and shape of said slots is subject to variation.
A valve 34 is slidable within the bore of the cage and includes a valve head 35 which is movable within the upper portion 29 of the bore. The head .is substantially frusta-conical and is adapted to engage an annular seat 33 which is formed at the lower end of the bore of the mandrel. A reduced shank 31 depends from the head, being preferably rintegral therewith, and said shank is slidable in the reduced portion 33 ofthe bore of the valve cage'. When the valve is in a lowered position (Figure l) the head 35 rests on the internal shoulder 3| within the valve Acage and a flow of well uid from the tubing `A through the slots 33 and into the mandrel bore Il is permitted; however, when the valve moves' to its upper positionA (Figure 2) the head 35 engages the seat 36 to shutoff the flow from the tubing through the mandrel.
The valve 34 is provided with an axial bore 33 which extends entirely through the shank 31 and head 35 and the bore is reduced at its extreme upper end to form an internal annular shoulder or seat 39within the head. Since the valve cage 28 has its bore open-at its lower end, it will be rate.
`upward jarring also shears the pins obvious that the well fluid may iiow upwardly through the` valve cage and into the axial bore 33 of the valve.
For closing the bore of the `valve 34, 'a ball or other :alve 43 is arranged to engage the seat 33 within the valve head. The ball rests on arey cessed disk 4| which is engaged by the upper'end pressure to holdthe valve 43 seated, whereby the i bore 33 of the valve is closed. It is noted that the nut 43 is annular so that the bore 33 is open to the well fluid pressure within the` tubing below the device.
In loweringjhe device into the well tubing, a suitable lowering device (not shown) is connected to the upper end of the mandrel I3 by means of shear pins (not shown), or other releasable means, which extend through openings 44 provided for this purpose. The device is thus suspended from the lowering device which is attached to a cable or wire line, and the lowering is continued until the depth at which it is desired to set the device'is reached. During the lowering operation the slips 22 merely ride on the surface of the tubing wall but do nottake hold as the mandrel is constantly moving ahead of said slips. Before loweringv the device, the well control devices which consist of the usual con'- trol valves, chokes and thelike `(notshown), at
the surface of the well tubing have been closed to shut oif any flow through the tubing and, therefore, the device moves downwardly through the fluid which might be standing in-the well. The packing cups 23 are in a normal undistorted position whereby there is a clearance between said cups and tubing wall to permit by-passing' of the well fluid Within the tubing around the device as it is lowered therethrough.
In order to set the device within the tubing A, a sudden upward pull is exerted on the mandrel I3 by means of the lowering device (not shown). Such upward movement of the mandrel causes the free riding slips 22 to be moved outwardly by the inclined surface 2|, whereby said slip teeth engage the tubing wall. Repeated upward jarring tends to more i'lrmly set the slips and such (not shown) which extend through the'openings 44 in the mandrel, after which the lowering device is removed from the" tubing. that the device could be set in other ways, as for 'example, by connecting the lowering means to the slip collar I3 and jarring downwardly.
After the slips 22 have been engaged with vthe tubing wall, the surface controls which control the production of the well, (not shown) are opened to permit the well fluid to flow upwardly through the tubing at the desiredppredetermined As soon as this flow starts, the packing cups 23 are deformed by the well fluid pressure into sealing engagement with the well tubing. This' fluid pressure may also act against the mandrel I3y to further tightenthe gripping engagement of the slips 22 with the tubing A.'
Further, the well uid pressure may move the valve 34 to its raised or seated position, although in many' instances, the `valve may remain in a lowered or open position.
In the event that the valve 34 has been seated,
then to unseat said valve to permit the ow of well uid from the tubing A through the slots It'is pointed out 3l inthe valve cage 28 and upwardly through the mandrel and tubing thereabove.- a tool having a rod or prong 4l is lowered through they tubing and bore ofthe mandrel (Figure 3) This.
rod has its lower end reduced at 48, whereby an external shoulder 4I is formed on said rod. The diameter of the rod is slightly smaller than the bore of the mandrel to permit flow past said rod while the reduced portion 4I is of such size as to permit its entering the upper end of the bore Ilot the valve head to engage the ball 4l.
When the device is set within the tubing and the valve 34 is closed, as has been explained, the well fluid is trapped below the same, whereby its pressure is exerted against the valve 34 to hold the same in a raised position. This pressure is often sufficient to prevent the valve 34 being l moved downwardly by merely engaging said valve with a rod or otherdevice lowered from the surface, `and in order to unseat the valve it is first-necessary that the pressures above and below the valve be equalized to some extent. It is to permit this equalization of pressures that the ball 4l is provided within the valve I4. Due to the fact .that the effective cross-sectional area l of the ball exDOSed t0 the well uid is much less than the effective cross-sectional area of the valve I4, the ball maybe more readily unseated by the jarring action. of the prong.'v
After the rod 45 is lowered through themanthe ball through the rod, whereby said ball is momentarily unseated from the shoulder 39 upon each jar. This unseating of the ball 40 allows well fluid to escape upwardly through the bore of the mandrel and into the tubing thereabove. Therefore, a, pressure will begin to build up above the valve I4 and this pressure will act against the pressure below thevalve, whereby a condi-4 tion soon occurs Awhich permits the ball valve 4G to be held entirely open, permitting the rod 45 tov be lowered so that its shoulder 41 engages the valve head "3l and moves the. same downwardly.` It is noted-that other ways of equalizing the lpressures across the valve 34,' such as by-:passing the well fluid from the casing to the bore of the tubing above the valve, may be emn pioyed, in which case the rball 4|I may be As soon as the valve `34 is moved to the posi-l tion shown in Figure 1, the rod 45 is removed. The 'well controls at the surface are then opened to "permit anormal or predetermined flow of at the surface, herein referred to, are standard flow of well viluids upwardly through the production stringat a desired or predetermined rate.
In some instances, the choke which is connected in the production string takes the form of an adjustable' metering valve while in others, said choke maybe. a nipple 'having a fixed orifice,
commonlyre'ierred to as a nowv bean. So far as the efficient operation of this invention is concerned the particular construction of the 'choke or other flow restricting or control de- 'vice, which is mounted in the production string,
is unimportant and so longas the well uids norl drel so that its reduced end 46 engages the ball, repeated jarring or hammering is imparted lto weunuieyupwardiy through the mandrel and tubing. '..It is pointed outthat the well controls v 3 determined rate under normal conditions, the invention shown herein will operate eulciently. As explained, the usual surface controls remain closed to shut in the well while the well device is run in and set and until the'valve 34 is moved to an open position. The controls are then opened and the usual surface choke (not shown) permits upward flow through the tubing. This flow is such that the force created by the fluid above the valve together with the weight of the valve, is sufficient to balance the upward force created by the well uid below the valve A and therefore, as long as the flow is at a normal or predetermined rate, the valve remains open or unseated and does not in any way interfere with the ilow upwardly through the mandrel.
It has been found that the well control connections and devices at the surface of the well sometimes fail orare broken. .This often occurs where wells are drilled in bodies of water in.
which event the casing and tubing must extend upwardly; through the water and above theI sur-V face thereof. The casing and tubing, in these instances.l may be broken ou under "'ater by passing ships, storms, driftwood, or from other causes .and such"breakage separates the well control connections: at the surface from the tubing in the hole, whereby the flowing wellis uncontrolled, because the usual surface choke or restricting means is, under such conditions, disconnected from the production string and unrestricted flow of well fluids from the string follows. Not only on underwater wells, but also on other wells, thesurface control connections are subject to breakage or failures.
The valve 34 remains in an open or inactive said valve. However, inr the event that the ,sur-
face connections fail orare broken, and the restriction of the Vusual surface choke or control is removed,- then obviously, the flow through the tubing above. the-mandrel. Iii is increased, re-
sulting in ain-increased ilow `velocity through the tubing and mandrel.
mediately vsets up or creates an increased force or impact against the lowerendA of the valve, which force or impact is caused by the sudden rushof iiuid upwardlyl against the valve. This increased force or -impact below the valve imme- 'diatelyraises said valve into engagement' with the seat 36- at the lower end of the mandrel', whereby the owis cut ofi. Thus, it will be seen that, in the event the surface controls fail or are broken, the valve immediately and automatically shuts o@ the flow-.to bring the well under control. The surface controls may berepaired or replaced, after which Vthe valve 34 is again lowered or opened by the rod 45, or'other means.
The removal of the entire device may be accomplished at any timeiby merely lowering a rethe mandrel causing the mandrel to move downmallyflow fromthe production string, which' is illustrated herein is1 the well tubing, at a premoving device (not shown) and engaging the same'beneath'the shoulder i4on the slip-carrying sleeve il. A downward jar is then imparted to wardlywith relation to the slips 22 which permits 'the slips to move. inwardly to a retracted position to disengage the saine from the tubing. The slips engage beneath the flange leon the mandrel asthe sleeve is pulled upwardly from the well, whereby said mandrel. is carried .upwardly therewith. VThe device may be set at a vdifferent depth within. the tubing, or it may be entirely're- The increased velocity im.
moved thv-ehem. The setting and removal may be accomplished by means of a cable or wireline. It is Pointed out that the action of the valve Il `is automaticin closing oflthe'flow, being controlled by the change in well conditions which may be due to various causes. j
In Figure 5, a slightly modified form of the invention isshown whereinopeningsor slots 33' in the valve cage `2l are made of less area than the slots 33 shown in Figure 1.` The combinedv area of the slots 33' is less than the cross-sectional area of' the bore of the mandrel, whereby said slots restrict the flow from the-tubing to the mandrel. The area of `the slots 33 is' sufllclent to permit a predetermined rate of flowJ therethrough and as long as such flow continues, the valve 3l remains in its open position. With the valve open and the fluid flowing at such predetermined rate, a pressure differential across the valve is set up, but this differential is not sumcient to close the'valve, the weight of said valve holding the same in its open position. In thev to secure by Letters l.. A well flowing control device including, an`
elongate unitary support having a flow passage through which the natural well fluid is conducted and open while the well is producing under nor-4 mal flowing conditions, said passage having a natural-well fluid inlet, and closure means free to move and carried by the support cow-acting with lthe inlet and passage of the .support and open while the natural well fluid is flowing through the inlet and passage under normal flowing conditions, said means having one side exposed to the natural well fluid flowing into the inlet and its other side shut oil' to such flow and exposed to the natural well fluids flowing from source, whereby the said closure means is held open during normal flowing conditions and is moved to a closed position to shut olf flow upward through the passage of the support when the velocity of flow of the well fluid is abnormally increased.
2. A well flowing control device including, an elongate support having a flow passage therethrough for conducting the well fluids while the well is producing and open under normal flowing conditions, said passage having an inlet for the well fluid, means for anchoring said support in a wellcasing, and closure means free to move and carried by the support and located so that the well uid entering through the inlet flows over the upperl sideof' said means and the well flui'd from the well exerts its pressure against thetunf derside of said means, said closure means remaining open under normal owing conditions and free to be closed by the well fluid upon abnormal increase in the velocity of the flowing well fluid.
3. A well flowing control device including, an elongate support having a flow` passage therethrough and a valve seat in said passage, said supDOrt having an inlet for the fluid from the well to said passage below and adjacent said valve seat, and a valve carried by the support below the valve seat and free to move, said valve being normally open with its upper side exposed to the also `\we1l uuid entering the inlet of the passage, the underside of the valve when open being shut of! from the well fluid flowing through the inlet and l into the passage and exposed to well iluidflowing from source, said valve being free to be movedto close against the seat when,the velocity of flow of the 'well fluid increases beyond a predetermined rate.
4. A well flowing control 'device removably mounted within a well tubing and including, a tubular support, means carried by the support for sealing off' between said support and tubing, said support having an opening therein disposed below'the sealing means whereby the flow of well fluid yfrom below said sealing means passes through said opening and upwardly through said support, a valve normally open while the well is producing and carried bythe support below sald opening and having its lower end exposed to the well fluid flowing from source, itsupper end being exposed to the natural well fluid flowing through the support, said valve being disposed and constructed to resist movement by a flowing natural Well fluid under normal flowing velocity, but to bemoved upwardly and closed by a flow of natural well fluid of excessive velocity.
5. A well flowing control device removably mounted within a well tubing including, a tubular support, means for sealing off between said support-and tubing, and a valve `normally open while the weil is producing and carried by the support below the sealing means for controlling the flow of the natural well fluid through said support, said support having an opening .above the valve and below the sealing means whereby the said well fluid may flow upwardly through the support and also having an opening below the` valve, whereby the valve has its opposite sides exposed to the natural well fluid flowing through the support and the well fluid below said valve, said valve being constructed andarranged to remain open under predetermined normal well flowing conditions and automatically closing when the velocity of said flow through the support exceeds a predetermined rate to change such ow conditions, and means for reopening said valve with the device mounted within the well tubing. Y
6. A well flowing `control device removably mounted within a well tubing and including, a tubularmandrel, means `carried by the mandrel for sealing off between said mandrel and tubing, said mandrel having an opening therein disposed below the sealing means whereby the flow of well fluid from below the sealing means passes through said opening and upwardly through they mandrel, a valve seat within the mandrel above said opening, a valve normally open while the well is producing'and within the mandrel adapted to engage said seat to cut off the flow of the natural well fluid through the mandrel, said valve being located below the opening so that its upper side is exposedy to theV natural well fluid flowing .through `the mandrel.- the lower side of the valve l,being exposed to the wellufluid below said valve, y
said valve being disposed and constructed to re.-
sist movement by a flowing natural well fluid 7. A well flowing control device removably mounted within a well tubing and includingpa tubular mandrel, means carried by the mandrel for sealing oi'l between said mandrel and tubing, said mandrel having an opening therein disposed resumed.
below the 'sealing means whereby the flow of well uid from below said sealing means passes through said opening and upwardly through the mandrel, a valve seat within the mandrel above.
said opening, a valve normally open while the well is producing and within the mandrel adapted to engage said seat to cut oi! the ilow of the natural well uid through the mandrel, said valve and connected with the support and actuated by the ilowing natural well iiuids ior shuttlng oir the flow through said passage when a predeterbeing located below the opening so that its upy per side is exposed to the said fluid flowing through the mandrel, the lower side of the valve being exposed to the natural well fluid below said valve, said valve being constructedI and arranged to remain open under predetermined natural well flowing conditions and automatically closing. when the velocity of ilow of natural well nuid through the mandrel exceeds a predetermined point to change such natural well flowing conditions, the sudden increase in ilow velocity causing an impact against the lower side of the valve which immediately moves said valve to its closed position, and means for reopening said valve with the device mounted within the well tubing.
8. A well flowing control device including, a' mandrel having a ilow passage therethrough, means for-sealing, H between the device anda mined abnormal tiow of the natural well iiuid occ urs in said passage, and means for causing said shut-on means to open to resume said flow. o
l2. A well device arranged to be located within y the bore of a well including, a support having a well casing, means kfor anchoring the device in a well casing, the passage of the mandrel having a valve seat, the mandrel having an inlet below the valve seat, a valve support having an inlet for the well fluid-below the inlet to the'eya valve resting on said support below said valveseat when open and free to move to close the discharge end of the inlet to said support, the upper side oi said valve being exposed to the well uid ilowing through the inlet to the passage, whereby saidvalve remains open during a normal ilow oi the well iluid, said valve being free to close upon an increasedy iiow velocity, and means freely movable down through the well tubing for unseating said valve.
9. A well flowing control device including, a
mandrel having a ilow passage therethrough..
means for sealing oif between the device and a well casing, the passage oi the mandrel having avalve seat, the mandrel having an inlet below Q ,the valve seat, a valve support having an inlet for thewell fluid below the inlet to the passage, a
l f valve resting on said support below vsaid valve seat when open and free to move to close the discharge end of the inlet to said support, the upper side of said valve being exposed to the well fluid ilowing through the inlet to the passage, whereby said valve remains open during a normal flow of the well iiuid, said valveA being free lto close upon an increased flow velocity, a spring. pressed valve mounted in the ilrst-named valve, and means freely. movable. down through/the well tubing to engage both valves for unseating the same. o
' vl0. A well flowing control device arranged to be located withinthebore of a flowing well including, a support having means for sealing itin' a well tubing and la. iiow passage therethrough, means `normally open while the well is producing and connected with the support and actuated by the iiowing natural well fluids for shutting oiithe `flow through said passage when a predetermined abnormal ilow ofthe natural well fiuidoccurs in' said passage, and a valve within said shut-o3 means adapted to be operated from vthe surface oi' the well toueiect the opening of said shut-ot! means so that the natural well ilow may be 11. A wen iniwingcontmll deviamnged to be rs `15.a wen device-arranged to `be located withinA flow passage therethrough, a valve cage at the lower end of said support, a valve member within said cage normally in a position to maintain the iiow passage open while the well is producing for controlling the ilowfor natural well iluid therethrough, said valve cage having an opening therethrough for directing nuid past the valve member as it flows through said ilow passage with the valve remaining open to permit saidv flow through the support under normal well flowing conditions, and said valve cage having an opening communieating with the under side oi' said valve member whereby the valve will be moved to its closed po' sition to cut oil.' said ilow of the natural well fluid when the velocity o! ilow through the support exceeds a predetermined.` velocity to change such flow conditions.
i3. A well device arranged to be located within the bore ot a well including, a support having a i valve member whereby the valve will be movedA to its` closed position to cut of! said ow o! the natural well iluid when the velocity of now through the support exceeds a predetermined velocity to change such ilow conditions, wherein the velocity diiierentials in pressure acting on the valve is controlledby the ratio of said iluid openings in the valve cage with respect to each other'.
14. A well device arranged to be located within the bore oi' a well including, a support having a iiow passage therethrough, a valve cage -at thei lower end of said support, a valve member within said cage normally in a position to maintain the ilow passage open while the well is producing `for controlling the ilow of natural wellfiuid there-` through, said valve cage having an opening therethrough for directing the uid past the valve member as it ilows through said flow passage with the valve remaining open to permit said iiow through the support under normal well owing conditions, and said valve cage having an opening communicating with the under side of said valve member whereby the valve will be moved to its closed position tocut oil said flow of the natural well iluid when the velocity o! ilow through the support exceeds a predetermined'velocity to change suchiiow conditions, wherein the velocity diii'erentials in pressure acting on'the valve for closingthe ilow passage is determined' by varying the restrictions oi' the cage opening tothe iiow of well uid through the device.
6 the bore cfa well including, a support having a flow passage therethrough, a valve cage at the lower end of "said support, a valve member within said cage normally in a position to maintain the flow passage open while the wellv is producing for controlling the dow of natural well fluid there- 4through, said valve cage having an opening therethrough for directing the fluid past the valve e member as it flows through said ilow passage with the valve remaining open to permit .said iiow through the support under normal well flowing conditions, and said valve cage having an opening communicating with the under side of said valve member whereby the valve willbe moved to its closed position to cut oi said iiow of the'natural y well fluid when the velocity of flow through the support exceeds a predetermined velocity to change such flow conditions, said valve member path of iiow through said passageway'adapted `to be closed' when the now through said passageway exceeds a predetermined rate.
20. In combination with a flowing well, a passageway leading from the bottom thereof, and means for preventing `more than a predetermined substantial rate of flow'upwardlythrcugh.
said passageway, comprising an upwardly closing valve in said passageway, which valve remains open during substantial upflow not "exceeding said predetermined rate of flow and is closedby a velocity of iiow exceedingsaid predetermined rate. f
271.' A Well flowing control device arranged to be disposed within they bore of aflowing well having a surface flow control and including, a
` supporting member having a ilow passage having a fluid passage therethrough with a restricted opening in line with the ow passage,
through the support, and a valve within said valve member yieldingly held in position to close said restricted opening in the valve member and accessible through the iiow passageway in the support to be opened'by an operating rod when the valve member closes the flow passage so as tore-establish the passageway through the device and efl'ectla movement of thevalve member l to open position.
16. A well device arranged tobe located within the bore of a well including, a support having a flow passage therethrough with a large orifice, means controlled by theflow of fluid therethrough for closing the passage when the velocity of iiow through the support exceeds a predetermined velocity as in the case of a. blowout, and means .thereafter for controlling the fluid flow through a smaller orifice.
17. A flow' controlling device having means for removably anchoring it in a well flow tubing and including, a support having means for sealing it in a well tubing and provided with a flow passage. therethrough, said support having a valve seat contiguous to its iiow passage and provided with a passage below said seat for admitting natural well fluid from source, and a valve carried by the support below said seat and movable up to said seat to shut oil? flow through the flow passage of the support, said valve being disposed in and co-acting with said support so as to lresist upward displacement by the well fluid flowing from source when said fluid is being discharged from the well under a predetermined normal flowing `velocity and to be moved upwardlyto engage said seat and cut oi flow of `the well fluid through the tubing when the iiow from the tubingl exceeds the said normal iiowing velocity.
1K8. A well flow control device as set forth in claim 17 wherein the valve has a flow passage normally closed, and means controllable from the vtop of the well for opening said valve passage.
19` In combination with a owing well, a casing within said well and a 'tubing within said casing, a packer surrounding said tubing and adapted to form a sealing engagement with said casing, means providing avpassageway through said packing, and a normally open valve in the through which the well fluids are conducted, and valve means carried by the supporting member and co-acting with said passage to control ow through the passage and `normally open while the well is producing, said means being disposed to be actuated by the flowing well fluids toshut olifl flow `through the passage when a predetermined abnormal upward ow of the well uid occurs in said passage.
22. A well flowshut-oif device having means for connecting it in the flow line of a well having 'a surface fiuidfiow control connected in its flow line and including, a passageway adapted to be connected to the flow line of the well, and valve means forpreventing more than a predetermined substantial' rate of flow upwardly through said passageway including an upwardly closing valve co-acting with said passageway, which valve remains open during substantial upward flow of the fluid not exceeding said predetermined rateof flow and is closed by a velocity of flow exceeding said predetermined rate.
23. In a well iiow shut-off device adapted to be mounted in the flow line of a Well, means for preventing more than a predetermined rate of flow of fluid upwardly through the well flow line having a valve seat and including an upwardly closing valve for engaging saidseat, which valve is sufficiently heavy to remain open during substantial upward flowof the fluid not exceeding said predetermined rate of flow and is disposed so as to be closed against said seat by a velocity of flow exceeding said predetermined rate.
24. A well flow shut-off device having means for connecting it in the flow line of a well and including, a body having a iiow passage for connection with the flow line of the well, a valve seat,ja movable valve member closing against said seat and sufliciently heavy to remain open during substantial upward iiow of fluid through said passage beyond said seatfnot exceeding a predetermined rate, and means in advance of said seat proportionedto permit flow of fluid through said passage while said predetermined flow rate is maintained and when said rate of flow beyond said seat increases and creates a predetermined pressure variation across said valve member the pressure of the fluid in advance of said means moves said valve member to close against said seat. 1
' HERBERT C. OTIS.
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