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Publication numberUS3215207 A
Publication typeGrant
Publication dateNov 2, 1965
Filing dateSep 20, 1962
Priority dateSep 20, 1962
Publication numberUS 3215207 A, US 3215207A, US-A-3215207, US3215207 A, US3215207A
InventorsSizer Phillip S
Original AssigneeOtis Eng Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Well tools
US 3215207 A
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Description  (OCR text may contain errors)

Nov. 2, 1965 P. s. SIZER 3,215,207

WELL TOOLS Filed Sept. 20, 1962 INVENTOR. PH lLLi P S. SIZER BY W United States Patent 3,215,207 WELL TOOLS Phillip S. Sizer, Dallas, Tex., assignor to Otis Engineering Corporation, Dallas, Tex., a corporation of Delaware Filed Sept. 20, 1962, Ser. No. 224,986 18 Claims. (Cl. 166122) This invention relates to well tool-s and more particularly to well packers for closing the annular space between two telescoped flow conductors, such as the easing of a well and the string of tubing disposed therein.

An object of this invention is to provide a new and improved well packer having anchoring means for engaging the internal surfaces of a well flow conductor which are movable outwardly into positions engaging the internal surfaces of the well flow conductor without any longitudinal movement being imparted thereto during such outward movement to extended positions whereby the anchoring means does not scrape or drag on such internal surfaces during outward movement to anchor the packer in the flow conductor.

Another object is to provide a well packer wherein the anchoring means includes a mandrel having two sets of outwardly movable slips one of which prevents upward movement of the well packer in the flow conductor and the other set of which prevents downward movement of the well packer in the flow conductor, and a sealing means movable into expanded position for sealing between the packer and the well flow conductor wherein the two sets of slips are moved to expanded positions and anchor the mandrel against movement in either longitudinal direction in the flow conductor before the sealing means is moved to expanded position to seal between the mandrel and the well flow conductor.

Still another object is to provide a packer wherein the mandrel is provided with means for releasably holding or locking an inner flow conductor which extends through the packer mandrel to the mandrel.

Still another object is to provide a well packer having hydraulic means for moving both sets of slips to expanded position and then the sealing means to expanded sealing positions, the hydraulic means being operated by fluid pressure introduced into the inner flow conductor connected to the packer.

A further object is to provide a well packer wherein the anchoring means and the seal means are urged toward expanded and sealing positions by fluid pressure within the flow conductor whereby the force tending to move the anchoring means and the seal means to their operative expanded positions increases as the fluid pressure increases in the flow conductor on either side of the seal means.

A still further object is to provide a well packer having two pairs of expander slips mounted on a mandrel for lateral outward movement only relative to the mandrel and having individual expander means movable longitudinally on the mandrel for moving the sets of slips outwardly -on the mandrel into anchoring engagement with the well flow conductor in which the packer is positi-onable and wherein the expander means are movable by fluid pressure from within a flow conductor extending through the mandrel and releasably secured thereto.

A still further object is to provide a well packer having a pair of cooperable telescoped means on the mandrel and movable by fluid pressure in opposite longitudinal directions on the mandrel for moving the two sets of anchoring slips into anchoring engagement with the well flow conductor and then moving the seal means mounted on the mandrel into sealing engagement between the mandrel and the well flow conductor in which the well packer is disposed.

3,215,207 Patented Nov. 2, 1965 Still another object of the invention is to provide in a device of the character set forth lock means for locking the pair of telescopable means to one another and against movement to their retracted or telescoped positions from their extended positions wherein they hold the anchoring slips and the seal means in expanded anchoring and sealing positions.

Additional objects and advantages of the invention will be readily apparent from the reading of the following description of a device constructed in accordance with the invention, and reference to the accompanying drawings thereof, wherein:

FIGURE 1 is a vertical, partly sectional view, with some parts broken away, showing the well packer 0f the invention in a well casing and releasably secured to a string of tubing and with its anchoring means and seal means in retracted positions;

FIGURE 2 is a view similar to FIGURE 1 showing the well packer anchored in the well casing with its anchoring means in expanded positions anchoring the well packer against movement in either longitudinal direction in the well casing and its seal means in expanded position sealing between the packer mandrel and the well casing;

FIGURE 3 is a sectional view taken on line 3-3 of FIGURE 1; and,

FIGURE 4 is a sectional view taken on line 44 of FIGURE 2.

Referring now to the drawings, the well packer 10 embodying the invention is employed to seal the annular space or annulus 12 between an inner flow conductor, such as the string of tubing 13, and an outer flow con ductor, such asthe well casing 14, and includes an elongate tubular mandrel 15 having a longitudinal bore or passage 16 in which is receivable a tubular seal nipple 18 which is connected in a string of tubing and con stitutes a section thereof. The upper end portion 19 of the seal nipple is internally threaded to receive the lower threaded end of the section 20 of tubing while its lower reduced end portion 22 may be externally threaded .for connecting a suitable well tool 24 to its lower end. It will be apparent that if desired any number of sections of tubing such as the section 20 may be interposed and connected between the lower end of the seal nipple and the well tool 24. t

The well tool 24 includes a sub 25 having a seat ring 26 telescoped in its lower end and releasably held therein by means of the shear pins 27. The seat ring has an upper beveled seat surface 28 which is engageablev by a suitable plug or closure means, such a the ball 29, for closing the lower end of the sub and therefore the lower end of the flow passage 30 of the tubing string. An O-ring 32 or other suitable seal means is disposed in an external annular recess of the seat ring for sealing between the sub and the seat ring above the shear pins 27.

The mandrel 15 of the well packer is releasably secured to the seal nipple 18 of the tubing string by means of the lug ring 35 threaded in the upper enlarged portion of the bore of the mandrel and having a pair of inwardly extending lugs 36 and 37 which are receivable in the inverted J slots 38a and 38b of the enlarged portion or external flange 40 of the seal nipple. The lugs 36 and 37 are initially disposed in the short leg portions 41a and 41b of the J slots 38a and 38b, respectively. The lower ends of the short leg portions of the J slots are defined by the upwardly facing stop shoulders 42a and 4212 which engage the lugs to support the packer mandrel on the seal nipple when the packer is being lowered into the well casing and to prevent upward movement of the seal nipple relative to the packer rnandrel when the packer mandrel is anchored in the well casing. The long leg portions 43a 3 and 43b of the J slots open downwardly of the external flange 40 of the seal nipple and the upper ends of the two leg portions of the J slots are connected by the connector portions 44a and 44b. Downward movement of the seal nipple in the mandrel is limited by the engagement of the downwardly facing annular shoulder 45 thereof with the upwardly facing annular shoulder 46 of the mandrel.

When the tubing string and the seal nipple are moved downwardly relative to the packer mandrel until the shoulders 45 and 46 engage, the lugs 36 and 37 are positioned at the upper ends of the J slots and in alignment with the connector portions 44a and 44b so that clockwise rotation of the seal nipple will cause the long leg portions 43a and 43b of the J slots to be positioned in alignment with the lugs 36 and 37, respectively.

The seal nipple 18 is then free to move upwardly relative to the mandrel until the annular upwardly facing shoulder 47 of the external flange 40 thereof engages the annular downwardly facing shoulder 48 of the inwardly extending flange 49 at the upper end of the tension sleeve 50 telescoped in the upper end of the packer mandrel and whose lower end is threaded in the packer mandrel to lock the lug ring therein. The tension sleeve has an internal annular recess 51 intermediate the ends thereof which causes the tension sleeve to have a thin section 52 of low mechanical strength so that the seal nipple, and the string of tubing 13 of which it constitutes a section, may be freed for upward removal from the packer mandrel when the packer mandrel is held against upward movement in the well casing and an upwardly acting force is applied to the tubing string of suflicient magnitude to cause the thin section of tension sleeve to rupture or fail. The seal nipple with the upper end portion of the tension sleeve still held thereon by the engagement of the shoulders 47 and 48 thereof may then be moved upwardly and out of the packer mandrel.

If it is desired subsequently to replace the seal nipple in the mandrel, the tubing string may again be lowered to position the seal nipple in the mandrel. The seal nipple is rotated to position the lower open ends of the long leg portions of the J slots into alignment with the lugs 36 and 37 which then enter into the lower open ends of the long leg portions as downward movement of the seal nipple is continued. When the lugs are positioned at the upper ends of the long legs, a counterclockwise rotation, as seen from above, is imparted to the tubing string to position the lugs above the short leg portions 41a and 41b of the J slots and subsequent upward movement of the tubing string, and therefore the seal nipple, then causes the engagement of the lugs 36 and 37 with the stop shoulders 42a and 42b defining the lower ends of the short leg portions of the I slots. The seal nipple, and therefore the tubing string, is now again locked to the packer mandrel and is held against upward movement relative thereto.

The packer mandrel has an external annular recess 54 defined by the downwardly facing annular shoulder 55, provided by the enlarged upper end portion 56 of the mandrel thereof, and by an upwardly facing annular shoulder 58 of an annular external flange 59 on the mandrel below the enlarged portion. The packer mandrel has a lower portion 60 of reduced external diameter below the downwardly facing shoulder 61 of the external flange 59. A plurality of anchoring means or slips 63 are mounted on the mandrel below the upper enlarged portion 59 thereof by means of the internal flanges or hooks 64 on the upper ends of said slips which are received in the external annular upper recess 54 of the packer mandrel so that upward movement of the slips is limited by the engagement of their upper ends with the downwardly facing annular shoulder 55 of the packer mandrel. The external flange 59 of the packer mandrel is received in the internal recesses 66 of the slips below the flanges 64 thereof.

Each of the slips has a substantially arcuate intermediate surface 70 adapted to engage the external surface of the reduced portion 60 of the packer mandrel when the slips are in the retracted positions illustrated in FIGURE 1, and each slip also has a downwardly and outwardly extending internal arcuate surface 71 extending downwardly from the intermediate surface 70 which is slidably engageable with the frusto-conical outer surface 73 of the upper slip expander 75 slidab'ly mounted on the packer mandrel. The slip expander is held in the lower position illustrated in FIGURE 1 by a set screw 77 threaded in suitable aligned bores in the upper slip expander and the mandrel.

The slips have external recesses 80 through which extend a plurality of retainer wires 81 which may be soldered together and which releasably hold the upper slips in their inner or retracted positions illustrated in FIGURE 1 wherein their upper end surfaces engage the annular downwardly facing shoulder 55 of the packer mandrel. The external upwardly facing serrations or teeth 83 of the slips, when the slips are moved to their expanded position by upward movement of the expander '75 on the packer mandrel which causes rupture or failure of the retainer wires 81, engage or dig into the internal surfaces of the well casing 14 and thus prevent upward movement of the packer mandrel in the well casing.

The lower end portion of the packer mandrel has a slip retainer nut 84 threaded thereon. The slip retainer nut has an external annular recess 85 whose lower end is defined by the upwardly facing annular shoulder 87 of the nut and whose upper end is defined by the annular downwardly facing shoulder 88 provided by the external annular flange 89 formed on the upper reduced portion of the retainer nut above the shoulder 87. The hooks or internal flanges 91 on the lower ends of the lower set of slips 92, which may be identical in configuration to the upper slips 63, are receivable in the external annular recess of the slip retainer nut and their downward movement on the retainer nut and on the packer mandrel is limited by the engagement of their lower ends with the upwardly facing shoulder 87 of the slip retainer nut. The flange 89 of the nut is received in the internal recess 93 of the slips.

Each of the slips is provided with an arcuate intermediate surface 94 which is adapted to engage the outer surface of the lower end of the reduced portion 60 of the packer mandrel when the slips are in the retracted positions on the mandrel illustrated in FIGURE 1. Each of the slips is also provided with an arcuate upwardly and outwardly extending surface 96 whose curvature and inclination conforms to that of the beveled or frusto-conical downwardly and inwardly extending cam or expander surface 97 of the lower section 98 of the cylinder sleeve 99 slidably mounted on the mandrel. The external teeth or serrations 100 of the lower set of slips face downwardly so that when the slips are moved outwardly to their expanded positions illustrated in FIGURE 2 upon downward movement of the cylinder sleeve on the mandrel, the teeth engage or dig into the internal wall surface of the well casing and prevent downward movement of the packer mandrel in the well casing.

The lower set of slips 92 are releasably held in a retracted position by a plurality of retainer wires 103 which extend through the external aligned recesses 104 of the slips and are soldered together. The wires rupture or fail when the cylinder sleeve is moved downwardly on the packer mandrel and causes an outwardly directed force to be exerted on the lower set of slips.

A seal or packing assembly is disposed about the mandrel below the upper slip expander 75 and may include the resilient seal elements 111, 112 and 113, the oppositely facing shoes 116 and 117 which engage the upper and lower surfaces of the upper and lower seal elements 111 and 113 and the backup rings 119 and 120 disposed longitudinally outwardly of the shoes 116 and 117, respectively. A spacer 122 may be positioned between the upper backup ring 119 and the lower annular end surface of the upper slip expander 75 in order to provide the required clearance or space for the upward and outward movement of the upper shoe 116 and the backup ring 119 'as the seal assembly is moved to the expanded position illustrated in FIGURE 2 wherein the shoes and the backup rings bridge the annulus 12 between the extrenal surface of the packer mandrel and the internal wall surfaces of the well casing to prevent extrusion or flow of the packing elements therepast.

The seal assembly and the upper slip expander are movable upwardly on the packer mandrel by an annular piston 125 telescoped in the annular space or chamber 126 between the packer mandrel and the upper section 127 of enlarged diameter of the cylinder sleeve 99. The lower section of the cylinder sleeve is threaded on the reduced upper end portion of the lower section 98 and a gasket 128 or other suitable seal means seals therebetween. The piston and the cylinder sleeve are releasably held in the fully telescoped positions relative to one another illustrated in FIGURE 1 by a shear screw 130 which extends through suitable aligned threaded apertures in the piston and the upper section of the cylinder sleeve and into a threaded lateral bore of the packer mandrel. The piston has an internal annular recess in which is disposed an O-ring 132 or other suitable sealing means which seals between the piston sleeve and the packer mandrel, and also has an external annular recess in which is disposed an O-ring 133 which seals between the piston and the cylinder sleeve.

A split lock ring 135 for locking the piston and the cylinder against telescoping movement is disposed in the external annular recess 136 in the lower end portion of the piston below the O-rings 132 and 133, and this lock ring is caused to move upwardly with the piston by the engagement of its lower end surface with the upwardly facing annular shoulder 138 defining the lower end of the external recess 136 of the piston. The lock ring 135 has an arcuate upwardly and outwardly beveled inner surface 140 which is engaged with a similar arcuate upwardly and outwardly beveled surface 141 defining the upper portion of the external recess 136 of the piston. Down- "ward movement of the piston relative to the locking ring tends to move the locking ring outwardly into engagement with the internal wall surfaces of the upper section 127 of the cylinder sleeve 99 and thus locks the piston against downward movement in the cylinder sleeve and the cylinder sleeve against upward movement on the piston.

The lock ring has a plurality of downwardly facing serrations or teeth 143 which engage or dig into the internal wall surfaces of the cylinder sleeve to hold the lock ring against downward movement in the cylinder sleeve. The downwardly facing teeth do not prevent upward movement of the lock ring in the cylinder sleeve since the upper surfaces of the teeth slope downwardly and outwardly and since upon outward movement of the piston sleeve relative to the cylinder sleeve the beveled cam surface 141 of the piston does not engage and tend to move outwardly the lock ring. The lock ring is split so that it may be widened to permit it to be moved upwardly over the lower external annular flange 136a at the lower end of the piston into the external recess 136 and thereupon retracts to cause its lower end surface to engage the shoulder 138 on the upper side of the flange 136a of the piston. The inherent dimensions of the resilient lock ring are such that it engages the internal sur faces of the cylinder sleeve when mounted on the piston whereby its teeth tend to prevent downward movement of the locking ring in the cylinder sleeve. Any downward movement of the piston relative to the cylinder sleeve will therefore cause the lock ring to be expanded outwardly into gripping or looking engagement with the internal surfaces of the cylinder sleeve due to the camming ,action between the beveled surfaces 140 and 141. The

6. lock ring thus prevents upward movement of the cylinder sleeve relative to the piston.

The lower section 98 of the cylinder sleeve has an internal annular recess in which is disposed an O-ring 145 which seals between the cylinder sleeve and the packer mandrel below the chamber 126 and below the port 146 of the packer mandrel which communicates the interior of the packer mandrel with the lower end of the annular chamber 126. When the seal nipple of the tubing string is disposed in the packer mandrel, the lateral port 147 thereof communicates with the port 146 of the packer mandrel so that fluid under pressure may be introduced into the lower end of the piston chamber 126 from the longitudinal bore or flow passage 150 of the seal nipple, which constitutes a portion of the flow passage 30 of the string of tubing, which extends to the surface of the Well. The seal nipple has an external annular recess 151 into which the port 147 opens in order to facilitate flow of the fluid from the flow passage of the string of tubing into the port 146 of the packer mandrel and thence into the lower end of the piston chamber 126.

The seal nipple has an external annular recess below the recess 151 in which is disposed an O-ring 154 which seals between the seal nipple and the packer mandrel below the ports 147 and 146. A pair of seal assemblies !156 and 157 disposed in the external longitudinally spaced annular recesses 1 58 and 1'59 of the seal nipple above the recess .15=1 seal between the seal nipple and the packer mandrel above the ports.

When it is desired to install the string of tubing 13 in the well casing 14, the operative elements of the packer are assembled in the positions illustrated in FIGURE l with the upper and lower sets of anchoring elements or slips .63 and 92 held in their fully retracted positions by means of the retaining wires 81 and 103 and due to their engagement with the smaller position of the expander surfaces 73 and 97 of the upper slip expander and the cylinder sleeve, respectively.

The upper slip expander 75 is releasably secured to the mandrel by the shear screw 77 with its smaller upper end disposed between the mandrel and the lower end portions of the slips 63. The cylinder sleeve and the piston are secured in their fully telescoped relationship to one another and to the packer mandrel by means of the shear screw 130 with the lower smaller end of the cam surface 97 of the cylinder sleeve disposed between the packer mandrel and the upper end portions of the slips 92. The teeth of the lock ring, due to its resilience and inherent dimensions, engage the internal surface of the cylinder sleeve. The upper section of the cylinder, sleeve is telescoped downwardly over the piston and over the lock ring after the lock .ring has been disposed in the external recess 136 of the piston, the downwardly facing teeth 143 of the lock ring permitting such downward movement of the upper sleeve section therepast. The lower cylinder sleeve section is then secured to the lower end of the upper section. If desired, the two sections may be rigidly secured to one another by any suitable means, such as welding, instead of the threaded connection shown.

The packer mandrel is now supported on the seal nipple by the engagement of the lugs 36 and 37 with the upwardly facing shoulders 42a and 42b of the J slots in the external flange 40 of the seal nipple. Any upward non-rotational movement of the packer mandrel on the seal nipple is arrested by the engagement of the upper shoulders of the lugs 36 and 37 with the downwardly facing shoulders 160a and 16% defining the upper ends of the J slots immediately above the short leg portions 41a and 41b of the I slots.

'When the string of tubing and the well packer have been lowered to the desired position in the well casing, various well operations may be performed before the packer is anchored in the well casing and closes the annulus between the tubing string and the well casing. For example, drilling fluids which may be present in the annulus 1-2 between the string of tubing and the well casing may be washed out or displaced with water or oil by pumping the water or oil down the string of tubing and tout through the lower open end of the well tool 24 and then upwardly through the annulus between the string of tubing and the well casing to the surface. Alternate ly, such circulation for displacing the drilling fluids may take place downwardly through the annulus and then upwardly through the open lower end of the well tool 24 and thence through the tubing string to the surface. The packer, when its upper and lower sets of slips and its seal assembly are intheir retracted or non-expanded positions, provides. a relatively large annular passage for the flow of fluids between the packer and the well casing.

After such well operations have been completed and it is desired to anchor the packer and seal the annular space between the well casing and the string of tubing, the ball 29 is dropped into the flow passage 30 of the string of tubing at the surface and allowed to fall therethrough until it seats on the seat surface 28 of the seat ring 26. Fluid under pressure is then introduced into the string of tubing at the surface, as by pumping, and the pressure thereof is communicated to the chamber 1.26 below the piston sleeve through the ports 147 and 146 of the seal nipple and the packer mandrel. When the pressure within the string of tubing at the port 147 of the seal nipple ri-sesto a predetermined value, the shear pin 130 between the piston and the cylinder sleeve is sheared and the cylinder sleeve is moved downwardly on the packer mandrel by the force of such fluid pressure exerted across the up wardly facing area of the cylinder sleeve between the lines of sealing engagement of the O-rings 133 and 145. Such downward movement of the cylinder sleeve moves the beveled expander surface 97 at the lower end of the cylinder sleeve downwardly between the packer mandrel and the cam surfaces 96 of the lower set of slips 92, cansing the retainer wires 103 to fail and moving the lower slips 92 laterally outwardly into locking engagement with the internal wall surfaces of the well casing. The downwardly facing teeth 100 of the lower set of slips then prevent any downward movement of the well packer [mandrel in the well casing. It will be noted that no longitudinal movement of the slips takes place during their outward movement to expanded positions since their lower ends are in engagement with the upwardly facing annular shoulder 87 of the slip retainer nut.

The piston cylinder 1125 has a downwardly facing area, defined by the lines of sealing engagement of the O-rings 1'32 and 133, exposed to the pressure of the fluid which is substantially equal to the upwardly facing area of the cylinder sleeve exposed to this pressure, but the upward movement of the piston cylinder, if the cylinder sleeve did not move downwardly first, would require that the shear screw 130 be sheared not only between the piston sleeve and the cylinder sleeve, but also between the piston sleeve and the packer mandrel. Accordingly, the cylinder sleeve moves downwardly first since its movement requires that the shear screw be sheared at one location only, i.e., between the piston sleeve and the cylinder sleeve.

As the cylinder sleeve moves downwardly on the packer mandrel and expands the lower slips outwardly, it moves downwardly past the teeth .143 of the lock ring 135, but since these teeth face do Wnwar-dly and since any frictional engagement between the teeth and the cylinder sleeve tends to move the lock ring downwardly and into engagement with the upwardly facing shoulder 138 of the lower flange 136a and toward the lower portion of the external recess .136 of the piston cylinder, the look ring has room to move inwardly to permit such downward movement of the cylinder sleeve. The internal surface of the cylinder sleeve therefore slides downwardly past the downwardly facing teeth of the lock ring.

When downward movement of the cylinder sleeve 8 stops, the fluid pressure communicated to the lower end of the chamber 126 acting on the downwardly facing annular area of the piston defined by the lines of sealing engagement of the O-rings 132 and 133 causes the shear screw 130 to shear between the piston and the mandrel and the pressure then moves the piston upwardly. Upward movement of the piston moves the packing assembly upwardly and tends to compress it against the upper slip expander. The shear screw 77, however, holding the upper slip expander in the lower position illustrated in FIGURE 1, shears when the upward force applied to the lower end of the upper slip expander exceeds a predetermined value which is lower than the value of the force necessary to compress the seal assembly fully and move it into expanded position and into engagement with the internal wall surface of the well casing. When the shear screw 77 shears, the piston moves the seal assembly 110 and the upper slip expander upwardly on the packer mandrel. The camming engagement of the beveled surface 73 of the slip expander with the similarly beveled or inclined surfaces 71 of the upper slips 63 causes the retainer wires 81 to rupture or fail and the upper slips are freed to move laterally outwardly as the upward movement of the upper slip expander on the packer mandrel continues. The force exerted on the upper slips by the upper slip expander is suflicient to cause the upwardly facing teeth or serrations 83 of the upper slips to engage and dig into the internal wall surfaces of the well casing until upward movement of the upper slip expander is arrested when no further outward movement of the slips can take place. It will be noted that the upper slips are moved only outwardly and not longitudinally since upward movement of the slips is prevented by the engagement of their upper ends with the downwardly facing annular shoulder 55 of the mandrel. Further upward movement of the piston now compresses the seal assembly 110 between the piston and the lower end of the upper slip expander and causes it to move to the expanded position illustrated in FIGURE 4 wherein the seal assembly closes and seals the annulus between the packer mandrel and the well casing and prevents flow of fluid therethrough.

As the piston 125 moves upwardly on the mandrel and relative to the sleeve cylinder the lock ring is moved upwardly therewith due to the engagement of its lower end surface with the upwardly facing shoulder 138, its downwardly facing teeth merely sliding along the internal wall surfaces of the sleeve cylinder.

When the seal assembly 110 is in its fully compressed position, upward movement of the piston stops and the continued pumping or introduction of fluid under pressure into the string of tubing increases the pressure within the flow passage of the string of tubing to the value which causes the shear pins 27 to shear, whereupon the ball 29 and the seat ring 26 are moved out of the lower end of the sub 25 to drop to the bottom of the Well.

The pressure within the flow passage of the string of tubing may now drop, and therefore the pressure in the piston chamber 126 below the piston may also decrease. Any downward movement of the piston due to the compressional force of the expanded seal assembly exerted thereon is arrested upon any slight downward movement of the piston since such slight downward movement of the piston will now cause the engagement of the beveled surface 141 of the piston with the beveled surface of the lock ring and the ring is expanded outwardly since the downwardly facing teeth or serrations of the lock ring prevent its downward movement in the cylinder sleeve. Any such slight downward movement of the piston therefore merely causes the teeth of the lock ring to engage more firmly the cylinder sleeve. The packing assembly of course still seals between the mandrel and the well casing. As a result, the lock ring locks the piston and the sleeve cylinder in their fully extended positions relative to one another wherein the piston holds the upper slip expander 75 in its upper position holding the upper slips in locking engagement with the internal wall surfaces of the well casing, and also holds the seal assembly in compressed and expanded position sealing the annulus between the packer mandrel and the well casing. No flow may now take place between the packer mandrel and the well casing due to the sealing engagement of the seal assembly 110 with the mandrel and the well casing, and similarly no flow of fluid may take place between the seal nipple and the packer mandrel due to the sealing engagement of the seal assemblies 156 and 157 with the seal nipple and the packer mandrel.

In addition to the force exerted by the piston holding the seal assembly 110 in sealing engagement with the well casing, if the pressure in the well below the well packer now exceeds that above the well packer an upwardly acting pressure diflerential exists across the seal assembly 110 and also holds the packing element in sealing engagement with the well casing. Should such pressure diiferential increase for any reason, as by an increase in pressure of the well below the well packer or due to a decrease in pressure above the packer, the increased pressure differential will cause a greater upward force to be exerted on the upper slip expander 75 so that the greater the upwardly acting pressure differential across the seal assembly, and therefore across the well packer, the greater will be the force holding the seal assembly in sealing engagement with the well casing and the greater will be the force tending to move the upper slips outwardly. Should the pressure differential for any reason be reversed, the packing assembly 110 will be exposed to a downwardly acting pressure differential thereacross which will tend to hold it in sealing engagement with the well casing and move it downwardly and since such downwardly acting force is now exerted through the piston and the cylinder sleeve, which are locked together by the lock ring 135, to the lower slips 92. The greater such downwardly acting pressure differential across the sealing assembly, the greater will be the force with which the lower slips are held in their locking engagement with the well casing.

When it is desired to remove the string of tubing from the well, the string of tubing is first lowered until the shoulder 45 of the seal nipple engages the shoulder 46 of the mandrel to cause the lugs 36 and 37 of the lug ring 35 to be positioned in the upper ends of the J slots above the short leg portions 41a and 41b. The string of tubing is then rotated in a clockwise manner, as seen from above, to position the lugs above the upper ends of the long leg portions 43a and 43b of the J slots and the tubing string is then moved upwardly, the lugs passing through the lower open ends of the long leg portions 43a and 43b of the J slots. As the string of tubing is moved upwardly, the upwardly facing annular shoulder 47 of the flange 40 of the seal nipple 18 engages the downwardly facing shoulder 49 of the tension sleeve and, when a sufliciently great upward force is exerted on the string of tubing, the thin section 52 of the tension sleeve ruptures or fails whereupon the string of tubing may be moved upwardly to the surface leaving the packer locked in position in the well casing.

Should it be desired to position the string of tubing again in the well casing and secure it to the well packer, the string of tubing is again lowered and so oriented that the lugs 36 and 37 of the packer mandrel move into the lower open ends of the long leg portions 43a and 43b of the I slots, and the string of tubing is rotated after the lugs are positioned in the connector portions of the J slots in a counterclockwise manner so that the lugs pass through the connector portions 44a and 44b of the J slots into longitudinal alignment with and above the upper ends of the short leg portions 41a and 41b of the I slots. The string of tubing is then moved upwardly until the lugs 36 and 37 again engage the upwardly facing shoulders 42a and 42b, respectively, of the seal nipple defining the lower ends of the short leg portions of the J slots whereupon the well packer holds the string of tubing against further upward movement relative thereto. The seal assemblies 156 and 157 and the O-ring 154 of the seal nipple then again seal on opposite sides of the port 147 between the seal nipple and the packer mandrel and normal production of well fluids through the string of tubing may then take place.

It will be apparent that either the tension sleeve or the I slots and their cooperable lugs 36 and 37 may be used separately to releasably secure the seal nipple to the well packer. If the tension sleeve alone is employed, once the tension sleeve is broken to permit the string of tubing to be lifted out of the well packer, there is no means for again releasably locking the seal nipple and the packer mandrel against upward movement relative thereto. For this reason, the J slots and lugs 36 and 37 are provided to permit such subsequent locking of the seal nipple to the well packer. The use of the tension sleeve in conjunction with the I slots is preferred since the tension sleeve will hold the seal nipple against upward displacement from the mandrel in the event of release of the lugs 36 and 37 from the J slots due to accidental rotative movement of the string of tubing, and the string of tubing can be freed from the well packer only when an upwardly directed force of a predetermined value is exerted on the string of tubing.

It will be noted that the seal assemblies 156 and 157 must function to seal between the mandrel and the seal nipple above the ports 147 and 146 at all times that the seal nipple is in position in the mandrel, while the O-ring 154 has no function once the lower end of the string of tubing is open. For this reason the seal assemblies 156 and 157 are of such construction as to provide the required sealing action between the seal nipple and the packer mandrel during the whole time the seal nipple is in position in the well packer.

It will be apparent that while the string of tubing has been provided with the well tool 24, which includes the sub 25 and the seat ring 26, for closing the flow passage of the string of tubing below the port 147 thereof, any other suitable well tool may be connected at the lower end of the string of tubing for this purpose and any suitable removable plug seatable in such well tool may be employed for the purpose of closing the flow passage of the string of tubing.

Since the upper and lower slips are held permanently in their expanded locking positions once the packer has been anchored in the well, due to the locking of the piston 125 and the cylinder sleeve 99 against any telescoping movement of the two relative to each other, the well packer cannot be released for removal from the well casing. The well packer is therefore formed of such drillable metals as bronze alloys in order that it may be drilled out in the usual well known manner after the string of tubing has been removed from the well.

It will now be seen that a new and improved well packer has been illustrated and described and includes a tubular mandrel having two sets of anchoring means or slips which are movable outwardly, without any longitudinal movement thereof relative to the mandrel on which they are mounted, into expanded positions wherein they anchor or lock the mandrel in a well flow conductor, one set of slips holding and anchoring the mandrel against movement in one longitudinal direction in the flow conductor and the other set of slips anchoring the mandrel against longitudinal movement in the opposite direction.

It will further be seen that the upper and lower slips are movable laterally outwardly of the mandrel to their anchoring position by individual expander means, such as the upper slip expander and the cylinder sleeve 99, upon longitudinal movement in opposite directions of such expander means on the mandrel.

It will further be seen that the slips do not move longitudinally of the surfaces of the well casing which they engage but move only laterally outwardly relative thereto, thus preventing dulling of the teeth and also minimizing the force necessary to move the slips to their expanded anchoring position, since if the slips were moved longitudinally relative to the well casing in the setting operation their teeth would dig into the well casing and a relatively great force would have to be applied to the slips to move them longitudinally of the well casing during their movement to anchoring positions.

It will further be seen that the two expander means of the two sets of slips are movable in opposite directions by fluid pressure introduced from the interior of the tubing string of the inner flow conductor which extends through the mandrel of the well packer and are held in any extended positions to which they have been move-d by the fluid pressure and against telescoping movement toward each other by a lock means, such as the lock ring 135, so that the mandrel is permanently anchored in position once the slips have been moved to their expanded anchoring positions in engagement with the well casing.

It will further be seen that the means for moving one of the slip expander-s, such as the upper slip expander 75, includes not only the piston 125 but also the seal assembly 110 which is interposed therebetween, and that the seal assembly is expanded into sealing engagement only after the upper slips have been moved to expanded anchoring position.

It will further be seen that the mandrel of the packer and the seal nipple of the string of tubing which is extendable therethrough are provided with co-engageable means for releasably holding the string of tubing in operative position in the mandrel.

The foregoing description of the invention is explanatory only, and changes in the details of the construction illustrated may be made by those skilled in the art, within the scope of the appended claims, without departing from the spirit of the invention.

What is claimed and desired to be secured by Letters Patent is:

l. A well packer including: a tubular mandrel; upper and lower anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; upper and lower expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said ex pander means; and means for moving said expander means relative to said anchoring means for moving said anchoring means to expanded position.

2. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position;

means releasably holding said anchoring means in retracted position on said mandrel; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement; of said expander means in opposite directions on said mandrel, one of said expander means including been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means; and means for moving said expander means relative to said anchoring means for moving said anchoring means to expanded position.

3. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; means releasably holding said anchoring means in retracted position on said mandrel; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means to expanded position.

4. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted posi tion and an expanded anchoring position; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means; means for moving said expander means relative to said anchoring means for moving said anchoring means to expanded position; and means initially releasably holding said expander means against movement on said mandrel toward positions wherein said expander means move said anchoring means to expanded positions.

5. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means; and means initially releasably holding said expander means against movement on said mandrel toward positions wherein said expander means move said anchoring means to expanded positions, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means to expanded position.

13 g 6. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means associated therewith has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means to expanded position. '7. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; means releasably holding said anchoring means in retracted position 'on said mandrel; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means associated therewith has been arrested, "said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring' means during movement of said anchoring means to expanded position by said expander means; -rneans for moving said expander means relative to said anchoring means to move said anchoring means to expanded position; and means initially releasably holding said expander means against movement on said mandrel toward positions wherein said expander means move said i anchoring means to expanded position.

8. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted posi- "tion and an expanded anchoring position; means releasably holding said anchoring means in retracted position on said mandrel; a pair of expander means movably carried by'said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means associated therewith has been arrested, said mandrel and said anchoring means having coengageable means preventing longitudinal movement of said anchoring means during movement of said anchoring 3 means to expanded position by said expander means; and

means initially releasably holding said expander means against movement on said mandrel toward positions wherein said expander means move said anchoring means to expanded position, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means ably holding said anchoring means in retracted position on said mandrel; a pair of expander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including seal means movable to expanded position when outward movement of the anchoring means associated therewith has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means to expanded position; and lock means for locking said expander means against movement relative to one another toward positions permitting movement of said anchoring means from expanded toward retracted positions.

-10. A well packer including: a tubular mandrel; a pair of anchoring means carried by said mandrel and movable laterally of said mandrel between an initial retracted position and an expanded anchoring position; a pair of ex pander means movably carried by said mandrel and engageable with said anchoring means for moving them from retracted to expanded positions upon longitudinal movement of said expander means in opposite directions on said mandrel, one of said expander means including expandable seal means movable to expanded position when outward movement of the anchoring means associated therewith has been arrested, said mandrel and said anchoring means having co-engageable means preventing longitudinal movement of said anchoring means during movement of said anchoring means to expanded position by said expander means; means initially releasably holding said expander means against movement on said mandrel toward positions wherein said expander means move said anchoring means to expanded positions, each of said expander means having means exposable to pressure of fluid from within said mandrel for moving said expander means in opposite directions on said mandrel to move said anchoring means to expanded position; and lock-means for locking said expander means against movement relative to one another toward positions permitting movement of said anchoring means from expanded toward retracted positions.

11. A well tool for securing an inner flow conductor in an outer flow conductor including: a tubular mandrel positionable between the inner and outer flow conductors and having means for releasably connecting the inner flow conductor to said mandrel; a pair of anchoring means carried by said mandrel and movable outwardly from initial retracted positions on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in a direction opposite said one direction; means on said mandrel engageable with said anchoring means for moving said anchoring means to anchoring position; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded position.

12. A well tool for securing an inner flow conductor in an outer flow conductor including: a tubular mandrel carried by said mandrel and movable outwardly from initial retracted position on said mandrel wherein said anchoring means are out of engagement with said outer fioW conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in the opposite longitudinal direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded position; and moving means on said mandrel for each of said anchoring means movable from initial retracted positions relative to each other to extended positions relative to each other, said moving means moving said anchoring means toward expanded position upon movement toward said extended positions, said moving means having means exposable to fluid pressure from within said mandrel for moving said moving means toward said extended positions.

13. A well tool for securing an inner flow conductor in an outer flow conductor including: a tubular mandrel positionable between the inner and outer flow conductors and having means for releasably connecting the inner flow conductor to said mandrel; a pair of anchoring means carried by said mandrel and movable outwardly from initial retracted position on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in the opposite longitudinal direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded position; individual moving means on said mandrel for each of said anchoring means movable from initial retracted positions relative to each other to extended positions relative to each other, said moving means moving said anchoring means toward expanded position upon movement toward said extended positions, said moving means having means exposable to fluid pressure from within said mandrel for moving said moving means toward said extended position; and lock means for preventing movement of said moving means toward said retracted positions relative to each other.

14, A well packer for sealing between inner and outer spaced telescoped flow conductors including: a tubular mandrel positionable between the inner and outer flow conductors and having means for releasably connecting the inner fiow conductor to said mandrel; upper and lower anchoring means carried by said mandrel and movable outwardly from initial retracted positions on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in a longitudinal direction opposite said one direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded positions; an annular piston longitudinally movably mounted on said mandrel; a cylinder sleeve mounted for longitudinal movement on said mandrel and providing an annular piston chamber outwardly of said mandrel, said piston having one end portion disposed within said chamher; means releasably securing said piston and said cylinder sleeve in retracted positions relative to one another and to said mandrel; means movable by said piston and said cylinder sleeve engageable with said anchoring means for moving said anchor-ing means outwardly into engagement with said outer flow conductor upon movement of said piston and said cylinder sleeve to extended positions relative to one another; and seal means disposed on said mandrel between said piston and said means for expanding said upper anchoring means and movable into expanded sealing engagement between said mandrel and the outer flow conductor when said upper anchoring means is in fully expanded anchoring position, said mandrel having port means communicating with said cylinder and the interior of the mandrel whereby fluid under pressure may be admitted into said chamber to move said piston and said cylinder sleeve to extended positions relative to each other.

15. A well packer for sealing between inner and outer spaced telescoped flow conductors including: a tubular mandrel positionable between the inner and outer flow conductors and having means for releasably connecting the inner flow conductor to said mandrel; upper and lower anchoring means carried by said mandrel and movable outwardly from initial retracted positions on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in a longitudinal direction opposite said one direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded positions; an annular piston longitudinally movably mounted on said mandrel; a cylinder sleeve mounted for longitudinal movement on said mandrel and providing an annular piston chamber outwardly of said mandrel, said piston having one end portion disposed within said chamber; means releasably securing said piston and said cylinder sleeve in retracted positions relative to one another and to said mandrel; expander means mounted on said mandrel engageable with said upper anchoring means for moving said upper anchoring means to expanded position upon upward movement of said expander means; seal means for sealing between said mandrel and the outer flow conductor disposed on said mandrel between said expander means and said piston, said cylinder sleeve having expander means engageable with said lower anchoring means for moving said lower anchoring means to expanded position, said expander means moving said anchoring means to said expanded positions upon movement of said piston and said cylinder sleeve in opposite longitudinal directions relative to one another, said mandrel having port means communicating with said cylinder and the interior of the mandrel whereby fluid under pressure may be admitted into said chamber to move said piston and said cylinder sleeve to extended positions relative to each other.

16. A well packer for sealing between inner and outer spaced telescoped flow conductors including: a tubular mandrel positionable between the inner and outer flow conductors and having means for releasably connecting the inner flow conductor to said mandrel; upper and lower anchoring means carried by said mandrel and movable outwardly from initial retracted positions on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer flow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in a longitudinal direction opposite said one direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded positions; an annular piston longitudinally movably mounted on said mandrel; a cylinder sleeve mounted for longitudinal movement on said mandrel and providing an annular piston chamber outwardly of said mandrel, said piston having one end portion disposed within said chamber; means releasably sesuring said piston and said cylinder sleeve in retracted positions relative to one another and to said mandrel; means movable by said piston and said cylinder sleeve engageable with said anchoring means for moving said anchoring means outwardly into engagement with said outer flow conductor upon movement of said piston and said cylinder sleeve to extended positions relative to one another; and seal means disposed on said mandrel between said piston and said means for expanding said upper anchoring means and movable into expanded sealing engagement between said mandrel and the outer flow conductor when said upper anchoring means is in fully expanded anchoring position, said mandrel having port means communicating with said cylinder and the interior of the mandrel whereby fluid under pressure may be admitted into said chamber to move said piston and said cylinder sleeve to extended positions relative to each other; and lock means engageable with said piston and said cylinder sleeve for preventing movement of said piston and said cylinder sleeve from extended positions to retracted position relative to one another.

17. A well packer for sealing between inner and outer spaced telescoped flow conductors including: a tubular mandrel positionable between the inner and outer fiow conductors and having means for releasably connecting the inner flow conductor to said mandrel; upper and lower anchoring means carried by said mandrel and movable outwardly from initial retracted positions on said mandrel wherein said anchoring means are out of engagement with said outer flow conductor to expanded positions wherein said anchoring means engage said outer flow conductor, one of said anchoring means when in expanded position preventing movement of said mandrel in one longitudinal direction relative to said outer fiow conductor and the other of said anchoring means when in expanded position preventing movement of said mandrel in a longitudinal direction opposite said one direction relative to said outer flow conductor; co-engageable means on said anchoring means and said mandrel preventing longitudinal movement of said anchoring means relative to said mandrel during movement of said anchoring means to expanded positions; an annular piston longitudinally movably mounted on said mandrel; a cylinder sleeve mounted for longitudinal movement on said mandrel and providing an annular piston chamber outwardly of said mandrel, said piston having one end portion disposed within said chamber; means releasably securing said piston and said cylinder sleeve in retracted positions relative to one another and to said mandrel; expander means mounted on said mandrel engageable with said upper anchoring means for moving said upper anchoring means to expanded position upon upward movement of said expander means; seal means for sealing between said mandrel and the outer flow conductor disposed on said mandrel between said expander means and said piston, said cylinder sleeve having expander means engage able with said lower anchoring means for moving said lower anchoring means to expanded position, said expander means moving said anchoring means to said expanded positions upon movement of said piston and said cylinder sleeve in opposite longitudinal directions relative to one another, said mandrel having port means communicating with said cylinder and the interior of the mandrel whereby fluid under pressure may be admitted into said chamber to move said piston and said cylinder sleeve to extended positions relative to each other; and lock means engageable with said piston and said cylinder sleeve for preventing movement of said piston and said cylinder sleeve from extended positions to retracted positions relative to one another.

18. In combination with the well packer of claim 14: a seal nipple having means for connection in a string of tubing to constitute a section thereof; said seal nipple having means engageable by said releasable connecting means of said mandrel to hold said seal nipple in predetermined longitudinal position relative to said mandrel; said seal nipple having port means; and seal means for sealing between said mandrel and said seal nipple on opposite sides of said port means of said seal nipple and said mandrel whereby fluid pressure from said seal nipple may be communicated through said port means to said chamber.

References Cited by the Examiner UNITED STATES PATENTS 3,002,564 10/61 Baker 1662l2 3,050,128 8/62 Brown 166120 3,062,291 11/62 Brown 166-134 X CHARLES E. OCONNELL, Primary Examiner.

Patent Citations
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US3062291 *May 11, 1959Nov 6, 1962Brown Oil ToolsPermanent-type well packer
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3394762 *Dec 11, 1964Jul 30, 1968Otis Eng CoWell tools
US3456723 *Jun 30, 1967Jul 22, 1969Camco IncHydraulically set well packer
US3602305 *Dec 31, 1969Aug 31, 1971Schlumberger Technology CorpRetrievable well packer
US3631924 *Mar 26, 1970Jan 4, 1972Schlumberger Technology CorpRetrievable well packer
US4263968 *Mar 11, 1980Apr 28, 1981Camco, IncorporatedHydraulic set and straight pull release well packer
US4413677 *Apr 27, 1982Nov 8, 1983Otis Engineering CorporationDual string well packer
US4834175 *Sep 15, 1988May 30, 1989Otis Engineering CorporationHydraulic versa-trieve packer
US5000265 *Jan 23, 1990Mar 19, 1991Otis Engineering CorporationPacking assembly for use with reeled tubing and method of operating and removing same
US5146994 *Dec 27, 1990Sep 15, 1992Otis Engineering CorporationPacking assembly for use with reeled tubing and method of operating and removing same
US5348088 *Jul 13, 1993Sep 20, 1994Camco International Inc.Coiled tubing external connector with packing element
Classifications
U.S. Classification166/122, 166/123, 166/212, 166/134
International ClassificationE21B33/1295, E21B33/12
Cooperative ClassificationE21B33/1295
European ClassificationE21B33/1295