US2772740A - Well packer - Google Patents

Description

Dec. 4, 1956 J. E. EDWARDS WELL PACKER 2 Sheets-Sheet 1 Filed Nov 16, 1953 L/ac/r Edwards INVENTOR. ym zjw ATTORNEY J. E. EDWARDS WELL PACKER Dec. 4, 1956 2 Sheets-Sheet 2 l/ -MM Filed Nov. 16,-1953 (Jack E. Edwards INVENTOR. %W% 41m ATTORNEY United States Paten =WELL PAC-KER Jack EtEdwards, Houston, Tex., assignor to M. L. 'May fild, Houston, Tex.

The present invention relates -to packers used in oil, gas and other wells' and, mo'reparticula'rly, relates to such a packer which may be "lowered into a well and set at any desired elevation therein and removed or reset and withdrawn, as desired.-

In the production of 'oil, gas and other wells, well packers are commonly used,'for example, for'providing'a seal in the well bore forex'cluding drilling fluid normally present in the well bore from 'a confined formation trav ersed by the well bore sothat'oil, gas and'the like may be permitted to flow upwardly through the string of pipe to which the packer is attached 'to the surface of the'ground. Well packers are used in conjunction with washing in a well, making formation tests, as well as providing a packed-off portion in the wellbore for other purposes.

In conventional well packers now in'use considerable difliculty has been encountered in providing circulation through the packer as it is being'lowered into or raised from the well bore. In many cases it is diflicult to remove the packer from the well bore after it has been set. Also, difiiculty has been encountered in releasably locking the packers in retracted position so that they might be withdrawn from the well bore or reset, as desired.

It is therefore a major object of the present invention to provide a well packer which may be set and removed, or reset and removed from a well bore, and which permits maximum circulation through and about the packer as it is being lowered into .or raised from the well bore.

It is yet a further and important object of the present invention to provide a well packer which may automatically be releasably locked in retracted position upon freeing the well packer to prevent inadvertent setting of the packer upon subsequent movement of the packer in the well bore, either for withdrawal or resetting and withdrawal.

A further important objectof .the present invention is the provision of a well packer in which it is possible .to seal ofi the circulation passages when removing the packer from set position so that pump pressure may be applied below the well packer to facilitate and aid in the removal of the packer from its set position in the well bore.

Yet a further object of the present inventionris the provision of a well packer in whichthe circulation passage is closed selectively at each end upon relative movement of parts of the packer so that well fluid may be sealed above the packer and may be placed under pressure below the packer to facilitate removal of the packer.

It is yet a further object ,of the present invention toprovide means releasably holding the elments of the packer so that a circulation passage extending throughout the tool is open for circulating, Yet which means may be released to close the passage at the topor the bottom of the tool for providing a packed-off area abovethepacker or providing pump-pressure:belowthepackerto aidinzand facilitate reelasing of the packer from set position.

\ 2,772,740 Patented Dec. 4, 1956 It -isyet affurther object of the invention to provide a J-slot assembly which automatically locks the parts of the Well tool in circulating position .on .reelasing the packet from anchored position.

A further object of thepresentinvention is the provision of awell packerprovided with a packing which may be compressed into vsealing engagement with the inner wall =of-the casing and which withstands high pressures and temperatures'in well bores andwill not vulcanize to the casing so that it-mayireadily be released from sealing position. I

A further object of the invention is the provision of a wellpacker which operable by relative movement of a mandrel and certain of :its other parts in which a long stroke is provided ,to 'facilitatejarring the well packer to aidin releasingit from anchored position, and which permits the tubing connected to the mandrel to be elevated above the rotary table, tubing hangers to be installed, the packer pressure tested, and blow-out preventers removed and thewell fittings (called the christmas tree in the trade) to be installed, all with the well packer anchored in packed-off or sealing position.

Yet .agfurther object of Ithe present invention is the provision of a well packer in which a standard length of tubing, such as upeset tubing, may be used for the mandrel, or tubing equivalent thereto, thereby providing substantially unrestricted fluid passages in the well packer and facilitating setting and unsetting of the well packer.

Itisxyet a'further obiectof the present invention to provide a well packer of the above character which may be manufactured, maintained and repaired economically and which-is rugged and durable in use.

Other and further objects, features and advantages of the presentinvention will be apparent from the following description of'an example of the invention, given for the purpose of disclosure, taken in connection with the accompanying drawings, where like character references designate like parts throughout'the several views, and Where Figure 1 is aside elevation, partly in section, of an apparatus constructed according to the invention, the parts being illustratedin position when the packer is low ered in the .well bore,

Figure 2 ,illusrtates the wellpacker of Figure l in set or anchoredposition in .a wellbore for the purpose of washingin a well, conducting a test, and the like, and

'Figure 3 is 'an enlarged, fragmentary, side-elevational view, partly in section, illustrating the lower portion of theapparatus of Figures 1 and 2 and showing the parts in position so that pump pressure may be applied below the well packer for facilitating and aiding in the removal of the well-packer from the well bore.

The wellpacker of the present invention is well adapted for use in washing-in wells, and, for purpose of disclo-' sure, an example of-the invention is described in connection with washing-in operations. Other uses and adaptations, of course, will suggest themselves to those skilled in'the art.

Referring now :to :the drawings, and particularly to Figure l, the reference numeral 10 designates a body of the well packer into which slidably extends the tubular :mandrel 12 so'that relative movement is permitted between the body 10 and mandrel '12 by which the tool is actuated, as will "be apparent later. The upper end of the mandrel 1-2 is threadedly or otherwise secured to a string of pipe 14 which extends to the surface, not shown, by means'of the coupling 16, which coupling also includes a valve member as will be apparent later.

The lowerendofthe mandrel 12 is threadedly or otherwise connected to a length of pipe 18, which may be termed a tail piece, by means of'the coupling 20, which,

similarly to the coupling 1'6, also includes a valve element as will be apparent later.

As indicated before, the body is substantially tubular or cylindrical, and as seen in the drawings, is recessed at the inner portion of its upper end, as at 21 which has the downwardly and inwardly tapered valve seating surface at 22 for a function described later.

Surrounding the upper portion of the body 10 and slidable or movable thereon is the packing'band 24 which may be of any suitable material, such as lead, rubber, neoprene or some material which may be expanded to provide a seal. Preferably, the packing 24 is: formed of lead or lead mesh inasmuch as lead may be expanded into sealing engagement with the inner walls of the casing 26 and yet at the pressures and temperatures occurring in deep wells will not become vulcanized to the casing, which sometimes happened when using rubber or some other flexible or plastic material.

The packing band 24 is confined by the downwardly facing shoulder 28 proximate the upper end of the body it) and the upwardly facing shoulder 30 disposed at the upper end of the slip and packing expander 32, the latter being slidably secured at its upper end to the body 10 by the pins 341: threaded to the body' and received in the slots 35.

The slip and packer expander 32 has its outward surface tapered downwardly and inwardly and slidably engages the reduced external portion 34 of the body 10 and r v the downwardly and inwardly tapered under surface 36 of the slips 38 disposed about the body 10. 'The outer slide surface of the slip and packer expanders 32 are slidably secured to the inner side 36 of the slips 38, such as by longitudinally extending dovetail elements, not shown, and, in general, the slip expander may be conical in configuration. The lower portion of the slips 38 are secured to the collar 40 surrounding the body 10 by tongue and groove arrangements, not shown. The manner of securing slips to the body and to a slip expander or cone and to the body are conventional, may be accomplished in any usual and customary manner, and no detailed description thereof is deemed necessary.

The collar 40 comprises an enlarged shoulder ofa sleeve member 42 which is slidably disposed about the body 10 at its lower and reduced diameter portion 34 and which has the friction or wiper blocks 44 secured thereto by means of the ears or projections 46 which may threadcdly be secured to the sleeve member 42 by means of the screws 48 or in any suitable manner. The friction blocks 44 have the projecting ears 50 which engage under the cars 46 which retain the friction blocks 44 in the pockets 45 formed in the sleeve member 42. While not shown, conventionally these friction blocks 44 have springs which yieldingly urge them outwardly into frictional engagement with the inner walls of the casing 26 so that the sleeve member 42 and associated elements may be maintained relatively stationary when the Well packer is released for actuation and the mandrel 12 and the body 10 might be moved to effect the setting and releasing operations of the well packer.

The lower portion of the sleeve 42, which is in effect the outward body member of the lower portion of the well packer, has the longitudinally or axially extending slots 52 for slidably receiving the pins 54 secured to the nose piece 56 which is threaded or otherwise secured to the lower outer end of the reduced portion 34 of the body 10. Thus, relative axial movement is permitted and rotation is prevented between the sleeve or lower outer body member 42 and the lower portion of the reduced diameter section 34 of the body 10 for the purpose of expanding and retracting the slips and packer as will be apparent later.

In order that the parts of the well packer may be rebody 10. While only a single J-slot is illustrated, ordinarilyin practice, two or more such J-slots are utilized.

The J-slot assembly 58 includes the downwardly and outwardly extending leg 59 which is tapered outwardly at its lower and free end 60 to insure reinsertion of the pin 66 therein after it has moved out of the leg 59 in setting the packer. The J-slot assembly 58 has the upwardly and inclined surface 62' at its inner end across the generally lateral leg 61 and has the downwardly and inclined surface 64 extending into the inwardly extending leg 63 to provide a cam action for the pin 66 secured to the collar 20 (which in turn is secured to the mandrel 12) which automaticallylmoves the pin 66 into the lower end of the inwardly extending leg 63 upon lowering the well packer into the cas'ing26 as illustrated in Figure 1. Upon lifting the well packer the pin 66 seats in the upper part of the lateral leg 61. Thus the mandrel 12 and lower sleeve member 42 are releasably locked against relative movement when the well packer is going into and out of the casing 26 except for the slight movement permitted by the inwardly extending leg 63.

It is also noted that the pin 66 engages and supports the lower end of the collar or nose piece 56 threaded on the lower inner end of the reduced portion 34 of the body 10 thereby serving to maintain that portion of the body in elevated position when the pin is in locked position. A recessed portion 68 is provided in the lower part of the collar 56 adjacent to and in alignment with the upper end of thelongitudinally extending slot 59 of the J-slot assembly 58 in order that the pin 66 may be moved upwardly a distance suflicient to permit closing of the valve at the lower portion of the reduced diameter portion 34 of the body 10 and so that when the pin is in locked position the valve at the lower portion of the tool will be in open position, as will be apparent later.

A valve seating surface 7G is provided on the lower inner end of the nose piece 56 secured to the lower end of the reduced diameter section 34 of the body 10 and the complementary and a cooperating valve seating surface 72 thereto is provided on the upper outer end of the lower coupling member 20. The valve seating surfaces 70 and 72 may be ground surfaces to effect a seal therebetween or, if desired, usual packing means may be provided upon engagement of the surfaces to effect a seal. Thus, when the valve surfaces 70 and 72 are engaged, flow of fluid through the annular passageway 78 disposed between the mandrel 12 and body 10 is prevented. v

The lower portion of the upper coupling 16 secured to the upper end of the mandrel 12 has the downwardly and inwardly tapered seating surface 74 which engages the cooperating valve seating surface 22 and these surfaces may be ground to effectively provide a seal. Of course, packing means may be utilized in place of these ground valve seats and, if desired, the O-rings 76 may be disposed about the coupling 16 so that when the mandrel 12 is in a lower position, as illustrated in Figure 2, the O-rings 76 sealingly engage the inner wall 21 of the upper portion of the body 10. Thus, when the valve surfaces 74 and 22 are engaged, flow of fluid through the annular passageway 78 isprevented.

It should be noted that the annular passage 78 disposed between the outer surface of the tubular-mandrel 12 and the tubular body 10 is-unrestricted along its length, which is advantageous in permitting circulation about the device when raising and lowering the well packer in a well bore, the well borenormally being filled with drill fluid. Also, whenthe mandrel is in elevated position, as shown-in Figure 3, the lower valve surfaces 70' and 72 are in engagement closing this passage "/3 from below and when the mandrel 12 is in lower position, as seen .in Figure 2, this passageis closed from above by the valve surfaces 74 and 22 engaging at the upper portion of the tool. As mentioned before, when going into and out of the hole, the circulation passage 78 is opened to the well fluid in the well bore by means of the J-slot assembly and related parts maintaining the parts in locked position.

In a washing-in operation, the well bore is filled with relatively heavy drill fluid and it is desirable to pack or seal off the drill fluid above the formation sought to be produced by relieving the hydrostatic pressure of the drill fluid so that the pressures in the formation may urge the pore content thereof into the well bore and up the interior of a string of pipe to the surface. Assuming that a well is to be washed in with the Well packer of the; present invention, in operation, the well packer is lowered into a well bore on the string of pipe 14 from the surface and the parts are in the position illustrated in Figure 1. When the well packer is lowered in the casing 26 to a point where it is desired to seal or pack off a section or formation for washing in the well (or any other desired use) the string of pipe 14 and mandrel connected thereto is raised and rotated, which rotates the pin 66 out of the inner leg 63, and the lateral leg 61'of the J-slot assembly 58. When the mandrel is lowcred the pin 66 moves out of the leg 59 and permits lowering of the mandrel 12 until the upper valve seating surface 74 engages the valve seating surface'22 at the upper portion of the body 10. The sleeve member 42, the body 18 and associated parts are maintained substantially stationary in the casing 26 at this point due to the friction blocks 44 frictionally engaging the inner wall of the casing 26. There may be some relative movement of the body and the sleeve member 42 until such time as theslips 38 engage the inner wall of the casing 26. When the valve seating surface 74 engages the valve seating surface 22 at the upper portion of the body 10 further downward movement of the string of pipe 14 and mandrel 12 connected thereto causes a downward movement of the body 10 and reduced diameter portion 34 thereby sliding the conical slip expander 32 downwardly with respect to the slips 38, the latter being maintained in substantially stationary position due to their engagement and connection with the sleeve member 42 which is held stationary by the friction blocks 44, thereby expanding or moving the slips 38 radially outwardly into frictional engagement with the inner wall of the casing 26. When'the slips 38 have been expanded into frictional engagement with the inner wall of the casing 26, the slip'expan'der 32 is fixed against furtherdownward movement and continued downward movement of the mandrel 12 effects further downward movement of the upper portion of the .bodylt) and the reduced diameter section 34 thereby compressing the packing 24 between the shoulders 28- and 30 thereby expanding it into sealing engagement with the inner Wall of the easing 26. Y

When the well packer is then set or anchored in packing or sealing position in the casing-26 the parts will be in the position illustrated in Figure 2. It is noted that a complete and effective seal is provided of the well fluid above the packer from that below so that the formation traversed by the bore hole to be washed in may be relieved of the pressure of the drill fluid against it. While not illustrated, the pipe section 18 or tail pipe may be perforated, slotted, open at its lower end and the like for the admission of fluid from the formation into the inner passage in the pipe 18, mandrel 12 and pipe 14 extending to the surface so that a wellmightbe washed in, tested and the like.

In washing in a well, the; string of tubing; 14 may be elevatedthereby raising the mandrel 12 to an intermediate position so that the passage 78 is open whileileaving the packer set or anchored in the casing 26. Water may be circulated down the annulanspace between the pipe against the face of the formation so that pore content thereof may be urged into the well bore, the tail pipe 18 and the internal passages in the mandrel 12 and pipe 14 to the surface. Of course, if desired, this circulation could be reversed, that is flowed downwardly through the pipe 14, mandrel 12, tail pipe 18 and up through the passage 78 and the annular space between the casing 26 and the pipe 14.

It is noted that the mandrel 12 may be a single length, although it may comprise a plurality of lengths, of ordinary upset tubing and that a considerable stroke may be obtained. A long stroke is advantageous in that after the packer has been set, the tubing 14 may be elevated above the rotary table at the surface, not shown, and a conventional tubing anchor installed. The packer may be pressure tested and the usual blowout preventers may be removed and the Well fittings, generally termed the christmas tree, may be made at the surface-all while the packer is set. In addition, the long stroke is advantageous in jarring the well packer loose.

.After the desired operations have been performed with the well packer in anchored position, the tubing 14 may be elevated so that the lower portion of the mandrel 14 and the casing 26, through the passageway 78, down 12 is in the position illustrated in Figure 3, which causes the valve seating surfaces and 72 to engage thereby closing the circulating passage 78 from below. Fluid under pressure may then be pumped down the interior of the tubing 14, through the mandrel 12 and out the lower end of the tail pipe 18 below the packer to aid in releasing the well packer from the casing. It is pointed out that a considerable amount of pressure will be brought to bear upon the lower portion of the coupling member 20 (by providing the enlarged downwardly-facing shoulder 79 thereon) which urges the inner reduced diameter section 34 of the body upwardly with respect to the outer lower portion 42 which is maintained substantially stationary by means of the friction blocks 44 frictionally engaging the inner wall of the casing 26. The pin 66 engages the bottom of the reduced diameter portion of the body 10 at therecess 68 and thereby moves the body upwardly. When the well packer is pumped loose the body 10 (and reduced diameter portion 34) is moved upwardly thereby permitting pin 66 to auto matically move or "be cammed by the cam surface 62 into lateral leg 61 thereby releasably locking the parts. After the well packer has been freed from the inner wall of the Well casing and is in locked position, it may be removed from the well bore or raised or lowered to a new location for the purposes of packing off a different section of the casing 26 or making a test or whatever operationmay be desired in which it is desirable to use a well packer.

As mentioned above, the tubing 12 may be of considerable length, for example, as much as a 28 foot stroke or more may be provided, to jar the packer loose in addition to the pumping action described. That is, the valve seating surfaces 70 and 72 become anvil and hammer surfaces, respectively.

The present packer is advantageous in that the tubing may be elevated above the rotary table, at the surface,

not shown, to install conventional tubing hangers with I the blowout preventers still connected, all while the packer is set. Also, in usinga full joint of upset tubing, which is approximately 30 feet,- a full opening through the central portion or mandrel 12 of the tool is provided and ease of operation is facilitated in the setting and pulling'of' the tubing or mandrel. Also, if'desired, the

present well packer permits the removal of blowout preventers and making'up of the well fittingsat the surface, known as the Christmas tree in the art, with the packer set. Y 1

The. present invention, therefore, is well suited to'attain the objects set forth and has the advantages mentioned as well as others inherent therein.

While only a single embodiment of the invention is givenfor the purpose of disclosure, changes in details and rearrangement of parts will readily suggest themselves to those skilled in the art which are encompassed within the spirit of the invention and the scope of the appended claims.

What is claimed is:

l. A well packer comprising, a generally tubular body, a packer element secured about the body, a sleeve member slidably disposed about the body, slips secured to the sleeve member and disposed about the body for radial expansion and contraction into and out of frictional engagement with an inner wall of a casing, a slip expander slidably secured to the body and engaging the slips, said slip expander and slips having guide and slide surfaces for such radial expansion and contraction of said slips upon relative movement of the slip expander and the slips, shoulders on the body and the slip expander abutting and confining the packer element whereby upon relative movement of said body and sleeve member in one direction said slips are expanded radially into such frictional engagement with the wall of the casing thereby fixing said slip expander against further movement in said one direction, continued movement of said body in said one direction compressing said packer element between said shoulders and expanding the packer element into sealing engagement with said wall of the casing, a tubular mandrel slidably extendin throughout the length of said body and said sleeve, said mandrel adapted to be connected to a string of pipe for raising, lowering and manipulating the well packer in said casing, an unrestricted passageway between the mandrel and the body, enlargements rigidly. connected on the mandrel exteriorly of and spaced from each end of the body for engaging each such end for moving said body relative to said sleeve member, coacting and engageable valve seating surfaces on each enlargement and each end of the body for selectively closing the passageways at each end on reciprocation of the mandrel relative to the body, at least one J-slot and pin slidable therein on the sleeve and mandrel releasably locking the mandrel and sleeve against relative movement, said pin engaging and supporting a lower portion of said body when in locked position, and friction means cooperating with the sleeve member yieldingly and frictionally engaging said wall of the casing forholding the sleeve substantially stationary during relative movement of said mandrel and body when said J-slot and pin are released.

2. A well packer comprising a generally tubular body, said body having a reduced external diameter extending from a point adjacent its upper portion downwardly throughout its length, a packing band secured about the body above the reduced portion, a sleeve member slidably disposed about the reduced diameter section of the body and below the packing band, slips secured to the sleeve member for radialexpansion and contraction into and out of frictional engagement with an inner wall of a casing, a slip expander slidably secured to the body and engaging the slips, said slip expander and slips having guide and slide surfaces for such radial expansion and contraction of said slips, shoulders on the body and slip expander abutting and confining the packing band whereby upon relative downward movement of said body with respect to said sleeve member, said slips are expanded into such frictional engagement thereby fixing said slip expander against further downward movement, continueddownward movement of said body compressing said packing bandbetween saidshoulders thereby expanding the packing band into scaling engagement with said wall of the casing, a tubular mandrel slidably extending throughout the length of said body and said sleeve member adapted to be connected to a string of pipe for raising, lowering and manipulating the well packer in said casing, an unrestricted annular; passageway between themand'rel and the body for circulation of drill fluid, enlargements rigidly connected on the mandrel disposed exteriorly of and spaced from each end of the body for engaging each such end for moving said body relative to said sleeve member and providing complementary hammer and anvil surfaces on the-enlargement below the body and on the lower end of the body, respectively, to jar said body upwardly relative to said sleeve member upon sharp upward movement of said mandrel, at least one J-slot and pin slidable therein on the sleeve member and mandrel releasably locking said mandrel and sleeve member from relative movement, said pin engaging and supporting a lower portion of said body when the'J-slot and pin are in locked position, and friction means on the sleeve member yieldingly and frictionally engaging said wall of the casing for holding the sleeve member substantially stationary during movement of said mandrel and body when said J-slot and pin are released. 7

3. A well packer comprising a generally tubular body, said body having a reduced external diameter extending from a point adjacent its upper portion downwardly throughout its length, a packing band secured about the body above the reduced portion, a sleeve member slidably disposed about the reduced diameter section of the body and below the packing band, slips secured to the sleeve member for radial expansion and contraction into and out of frictional engagement with an inner wall of a casing, a slip expander slidably secured to the body and engaging the slips, said slip expander and slips having guide and slide surfaces for such radial expansion and contraction of said slips, shoulders on the body and slip expander abutting and confining the packing band whereby upon relative downward movement of said body with respect to said sleeve member, said slips are expanded into such frictional engagement thereby fixing said slip expander against further downward movement, continued downward movement of said body compressing said packing hand between said shoulders thereby expanding the packing band into sealing engagement with said wall of the casing, a tubular mandrel slidably extending throughout the length of said body and said sleeve member adapted to be connected to a string of pipe for raising, lowering and manipulating the well packer in said casing, an unrestricted annular passageway between the mandrel and the body for circulation of drill fluid, enlargements rigidly. connected on the mandrel disposed exteriorly of and spaced from each end of the body for engaging each such end for moving said body relative to said sleeve member, such enlargements and such ends of the body including coacting and engageable valve seating surfaces for selectively closing the passageway at each end at least one J-slot and pin slidable therein on the sleeve member and mandrel releasably locking, said mandrel and sleeve member from relative movement, said pin engaging and supporting a lower portion of said body when the J-slot and pin are in locked position, and friction means on the sleeve member yieldingly and frictionally engaging said wall of the casing for holding the sleeve member substantially stationary during movement of said mandrel and body when said J-slot and pin are released.

4. The well packer of claim 3 where the pin engages the bottom of the body and the J-slot has a cam surface at its inner end for automatically moving the pin into locked position upon upward movement of the mandrel.

, 5. The. well packer of claim 3 Where the J-slot comprises a generally axially extending leg downwardly and out the lower end of the sleeve member, a generally laterally extending leg interconnected with the axially extending legtand a generally downwardly extending leg interconnected with the remote end of the lateral leg, said lateral and downwardly extending legs having cam surfaces for camming the pin into locked position upon upward movement of the mandrel, said pin engaging the lower end of the body when in locked position and supporting the body so that the valve seating surfaces on the lower enlargement and lower end of the body are in spaced relation to onetanother, and a recess in the lower end of the body proximate the upper end of the axially extending leg for reception of the pin whereby the mandrel may be moved upwardly to engage the valve seating surfaces at the lower end of the body and on the lower enlargement to close the pasageway.

6. The well packer of claim 3 where the lower enlargement includes a downwardly facing pressure surface whereby fluid pressure circulated downwardly through the string of pipe and mandrel may be directed upwardly against the pressure surface for facilitating upward movement of the body member and release of the packing band and slips. 7

7. The well packer of claim 3 where the mandrel comprises a length of tubing externally upset at each end for threaded connection to said enlargements.

8. The well packer of claim 3 where the packing band is formed of lead.

9. The well packer of claim 3 where the engageable valve seating surfaces on the enlargement below the body and at the lower end of the body comprise hammer and anvil surfaces, respectively, to jar said body upwardly relative to said sleeve member upon sharp upward movement of said mandrel.

10 10. The well packer of claim 3 where the sleeve member extends downwardly below the lower end of the body and the lower end of the body has a recessed portion proximate an inner end of the J-slot so that the mandrel may be elevated to engage the valve seating surfaces on the lower enlargement and lower end of the body by moving the pin into the recessed portion, and upon rotation of the mandrel with respect to the sleeve member the pin is moved out of said recessed portion and into locked position with the J-slot thereby placing the valve seating surfaces on the lower enlargement and lower end of the body in spaced relationship to one another.

References Cited in the file of this patent UNITED STATES PATENTS Re. 16,577 Crowell Mar. 29, 1927 880,213 Heeter Feb. 25, 1908 1,671,223 Britton May 29, 1928 2,620,036 Morgan Dec. 2, 1952

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