Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3130788 A
Publication typeGrant
Publication dateApr 28, 1964
Filing dateMar 27, 1962
Priority dateMar 27, 1962
Publication numberUS 3130788 A, US 3130788A, US-A-3130788, US3130788 A, US3130788A
InventorsWudleigh B Cochran, James D Mott
Original AssigneeCicero C Brown
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Anchoring device for well tools
US 3130788 A
Abstract  available in
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Ap 1964 c. B. COCHRAN ETAL 3,130,783

ANCHORING DEVICE FOR WELL. TOOLS Filed March 27, 1962 3 Sheets-Sheet 1 z CHUDLE/GHB. CD /{MN L/A MES D. MO T 7' INVEN TOR.

A rrM-A/FY April 28, 19 c. B. COCHRAN ETAL 3,130,738

ANCHORING DEVICE FOR WELL. TOOLS Filed March 27, 1962 3 Sheets-Sheet 2 A TTOR/VEY April 28, 1964 c. a. COCHRAN ETAL 3,130,788

ANCHORING DEVICE FOR WELL TOOLS 5 Sheets-Sheet 3 Filed March 27, 1962 CHUDLf/Q/ B. COCA r64 JAMES D. MOTT ATTOR/VE Y Jnited States Patent 3,130,788 ANCHORING DEVICE FOR WELL TOOLS udleigh B. Cochran and James D. Mott, Houston, Tex.,

assignors to Cicero C. Brown, Houston, Tex. Filed Mar. 27, 1962, Ser. No. 182,886 13 Claims. (Cl. 166-217) this invention relates to improvements in anchoring ices for well tools and refers more particularly to h anchoring devices especially adapted for securing 'ious well tools within a string of well pipe at preected levels therein and in such manner that the tools .y be released and withdrawn from the well pipe when tired. anchoring and landing devices currently in use inde as basic elements a locator tool and a latching color landing nipple placed in the pipe string to establish )lace to land an anchoring device. This requires a of latch elements variously called dogs or slips, on anchoring device with a configuration which will corpond to the configuration of grooves or recesses med in the landing nipple. When the locator tool is 1. into a well pipe, such as a tubing string, on a wire a, the tool will pass all collar recesses and other inruptions in the smooth bore of the tubing string, but en the tool comes to a recess in a landing nipple hava configuration matching that of the latch elements, locator will project into that recess and anchor the l at this point. Frequently several such tools must be ded in a tubing string and in order to accomplish this, i of matching configurations for the latch elements I landing nipple recesses are required to selectively the tools in their proper positions. It will be seen, refore, that each landing nipple must have a configura- 1 peculiar to latches on the particular tool to be landtherein. Accordingly, it will be evident that it is 'antageous both economically and to simplify operais to have the engaging parts of all tools and landing ples of the same configuration. another disadvantage of the present landing nipple tions is that they require locking grooves or recesses ing upwardly facing abrupt stop shoulders. Such iulders contribute to difficulty in running other wire 2 devices through the nipple sections. Fhe present invention has for its primary object the vision of an anchoring device employing a single set latch elements and landing nipples having recesses of form configuration corresponding to the single set of :h elements. This arrangement provides a simple econical and compact structure. t is, therefore, an important object of this invention to wide an anchoring device of simple and compact coniction that may be selectively set in any one of a pluity of like landing nipples in a pipe string. \nother important object is to provide a simple, posimeans of attaching the anchoring device to the wire a by which it is run into the hole and which will rese the wire line from the anchoring device automatily when the tool is anchored. )ne object of this invention is to provide an anchordevice that may be anchored in a landing section hout the necessity of an abrupt stop shoulder thus ninating a place which wire line tools would have difilty in passing. 8 very important object of this invention is to proe an anchoring device with a pressure balanced actuatand releasing mandrel such that difierential pressure ing from either above or below the tool will not unset anchoring device. still further object of this tool is to provide a means bleeding oil pressure below the tool while it is seely locked in its anchored position to obviate the ice possibility of prematurely releasing the tool before the pressure is bled OE and having the device blown up the hole.

Additional objects and advantages of the invention will be readily apparent from the following detailed description of a device constructed in accordance with one embodiment of this invention, reference being had to the accompanying drawing thereof, wherein:

FIG. 1 is a view, partly in elevation and partly in section, of the locking and scaling portion of a landing section and showing an anchoring device being lowered into the tubing past the anchoring position;

FIG. 2 is a view similar to FIG. 1, showing the anchoring device in position in the landing section as the anchoring device is being raised;

FIG. 3 is another view similar to FIGS. 1 and 2, showing the anchoring device raised above its anchoring position preparatory to lowering and seating it in anchored position;

FIG. 4 is a view similar to FIGS. 1, 2 and 3, showing the anchoring device anchored into position in the landing section and also showing the wire line running tool released and withdrawn;

FIG. 5 is a horizontal cross-sectional view taken on the line 5-5 of FIG. 3;

FIG. 6 is a horizontal cross-sectional view taken on line 6-6 of FIG. 3;

FIG. 7 is a horizontal cross-sectional view taken on line 7-7 of FIG. 4;

FIG. 8 is a horizontal cross-sectional view taken on line 88 of FIG. 1;

FIG. 9 is a horizontal cross-sectional view taken on the line 9--? of FIG. 1; and

FIG. 10 is a fragmentary view of a modification of the anchoring device.

In the drawings (FIGS. 1 to 4), there is shown a portion of a pipe string P which may be a string of flow tubing for conducting well fluids from a producing formation of a well to the ground surface. Pipe string P is made up of a plurality of lengths of tubing 10 between sections of which are interposed one or more latching collars or landing nipples 11 having a bore 12 which is substantially flush with bore Illa of tubing 10. Each landing nipple has an internally threaded socket 13 at its upper end for connection to the threaded pin 14 on a section of the tubing, and has an externally threaded pin 15 at its lower end for reception in the box portion 16 of the next adjacent section of tubing 10. It will be understood that as many of these landing nipples may be installed in a tubing string as may be found necessary for anchoring a variety of tools. It will be understood that these landing nipples are identical in construction and the description of one will, of course, be applicable to all others which may be incorporated in the tubing string.

An annular positioning and locking groove 17 is provided in the bore wall of nipple 11 and has its upper and lower ends formed as inclined, inwardly converging upper and lower shoulders 18 and 19, respectively.

The anchoring device, for use with the landing nipples, comprises an anchoring section, designated generally by the numeral 2%), and a landing and retrieving section, designated generally by the numeral 21. Anchoring section 20 includes a tubular body 22 having an axial bore 23 counterbored from its upper end to form the counterbore 24 and defining the upwardly facing internal shoulder 25. The exterior of body 22, from a point just below shoulder 25, is reduced in diameter at 26 to define the downwardly facing annular shoulder 27. The lower end of reduced diameter surface portion 26 is externally threaded at 28. A tubular slip cage 29 having an internally threaded socket 30 threadeclly receives the lower end of body 22. The upper end of cage 29 forms an external shoulder 31 which is spaced from shoulder 27 defining therebetween a packing recess in which is mounted a plurality of rings of a conventional packing 32. A plurality of radial windows 34 (three shown) are cut through the wall of slip cage 29 on 120 spacing and are of generally rectangular configuration adapted to receive therein slips 35 which are radially movable in the windows. Cage 29 has an internal bore 36 which is larger in diameter than bore 23 of the body. The portion of bore 36, a short distance below windows 34, is reduced in diameter at 37 and this reduced diameter portion is undercut to form the recess 38 defining the downwardly facing internal shoulder 39. The exterior of the lower end of cage 29 is reduced in diameter and externally threaded to receive a cap 40 having an axial bore 42 substantially flush with the bore of reduced diameter portion 37 and when screwed into place on the lower end of cage 2) defines the lower wall of recess 38. The lower end of body 22 is bevelled to define the downwardly tapering shoulder 43 and the reduction in bore diameter at 37 relative to bore 36 provides an oppositely bevelled shoulder 44, shoulders 43 and 44 being spaced approximately equal distances above and below windows 34.

Slidably disposed in the bore of body 22 is a generally cylindrical mandrel, designated generally by the numeral 45, comprising co-axially connected upper and lower Sections 46 and 47, respectively, having a common bore 48 which opens to its lower end. The lower end of the mandrel projects below the lower end of anchoring section 20 and will be provided with suitable means (not shown) for connecting thereto any type of tool which it is desired to anchor in the pipe string. However, it is a feature of this invention that the anchoring device may be used simply as a plug for the tubing, in which case no other tool need be attached to the mandrel. The upper end of mandrel portion 46 is internally threaded to receive a closure plug 51 which is screwed into the upper end of mandrel portion 46. Plug 51 serves to close off bore 48 completely against fluid flow from the upper end of mandrel portion 46. Plug member 51 has a radially enlarged section 52 which extends radially outwardly of the exterior of mandrel portion 46 and defines a downwardly facing shoulder 53. Plug member 51 is provided with an upstanding tubular extension 54 having an external diameter less than that of enlargement 52, the bore of extension 54 defining the socket 54a. Plug member 51 forms a part of the means by which the anchor member 26 is connected to landing and retrieving section 21 and will be described in greater detail hereinafter.

The lower end of upper mandrel portion 46 is internally threaded to form a box 55 to threadedly receive the upper end of lower mandrel portion 47. The exterior wall of box 55 is dimensioned to form a close sliding fit in bore 24 of body 22 and a slidable seal 56, such as a conventional O-ring, is mounted in the exterior of box 55 to seal with the wall of bore 24. The exterior of upper mandrel portion 46 just above box 55 is reduced in diameter to provide the upwardly facing shoulder 57 and to define an annular space 58a between the exterior of mandrel portion 46 and the wall of counterbore 24. A tubular bushing 58 is screwed into the upper end of body 22 and has a bore providing a sliding fit about the exterior of mandrel portion 46 and forming a closure for the upper end of annular space 580. A sleeve piston 60 is slidably mounted in the upper portion of annular space 58a and is provided with internal and external seals 61 and 62, respectively, to form a sliding seal between the exterior of mandrel portion 46 and the wall of counterbore 24. A coil spring 63 is mounted about mandrel portion 46 in space 58a and has a free length less than that between shoulder 57 and the lower end of piston 60, but which, at certain stages of operation of the device, as will appear hereinafter, will be compressed therebctwecn to urge these members apart. The upper end 64 of piston 60 and the opposing end face 65 of bushing 58 are oppositely bevelled to form inwardly converging earn surfaces between which are mounted a plurality 01 ball detents 66 which are urged outwardly toward the exterior of mandrel portion 46 by cooperation of the carr surfaces under pressure exerted against piston 60. The exterior of mandrel portion 46 is provided with an annular latching groove 67 into which detents 66 will project when the mandrel is moved to a position at whicl'. groove 67 is in registration with detents 66. One or more radial ports 68 are provided through the wall of body 22 at a point just below bushing 58 and provides fluid communication between the portion of annular space 5811 occupied by detents 66 and the exterior of body 22. One or more radial ports 69 are provided through the Wall 01 mandrel portion 46 above shoulder 57 to provide communication between bore 45 of the mandrel and annular space 580. One or more radial ports 70 are provider through the wall of body 22 at a point immediately above internal shoulder 25 to provide communication betweer the portion of annular space 58a which is below box 55 and the exterior of body 22. When there is a ditferentiai pressure from below the anchoring device, pressure ma} enter ports 69 from bore 48 and act against piston 60 Thus the pressure will act to move the cam surfaces 64 and 65 together which will force the ball detents 66 inwardly toward the exterior of the mandrel. Once the bali detents latch into the groove 67 any differential pressurr from below the tool would act against the piston and prevent the balls from coming out of the groove. This effec' tively holds the mandrel in the set position (FIG. 4) S( that it cannot be moved to release the slips or dogs 35 until the pressure above and below the tool is equalized A packing ring 71, such as a conventional O-ring, i: mounted in the wall of bore 23 between shoulder 25 ant the lower end of the body to form a slidable seal be tween the body and the exterior of lower mandrel por tion 47. The lower end portion of lower mandrel por tion 47, which projects through cap 40, is provided witl an elongate annular groove 72 defined by an upper shoul der 73 and a lower shoulder 73a. This annular groovi 72 is movable longitudinally in response to the move ments of the mandrel between a position at which groovs 72 is in registration with recess 38 and at which upper shoulder 73 is below recess 38. A split or segmentec retainer ring 74 is mounted in recess 38 and is confinet by a garter spring 75 to urge the segments about the ex terior of the mandrel so that when groove 72 is oppositr recess 38, retainer ring 74 will collapse inwardly ant enter groove 72 (FIG. 2) and lock the mandrel agains downward movement by engagement with shoulder 73 Returning now to the locking slips 35. These are gen erally rectangular in outline to be freely slidable in win dows 34 and are generally arcuate in transverse cros: section having a smooth convex exterior surface 41 ant provided with lateral extensions 35a which project intc an annular recess 36a in the wall of bore 36 (FIGS. 1 and 8) to prevent the slips from falling outwardly frorr windows 34. The inner face of each slip is defined by 2 pair of longitudinally spaced outwardly projecting ar cuate shoulders 76 and 77 at its upper and lower ends the opposed inner faces 78 and 79, respectively, 01 shoulders 76 and 77 forming the opposite end walls 01 an intervening groove 89. End faces 78 and 79 art bevelled to converge inwardly toward the bottom 0: groove 80. The outer faces 81 and 82, respectively 0: shoulders 76 and 77 are bevelled downwardly and inwardly from the adjacent ends of the slip toward the inner face of the slip. Outer edges 83 and 84 of th: ends, respectively, of each slip are bevelled outwardly toward the outer face of the slip, being inclined oppo sitely to faces 81 and 82. The angles at which the sev eral faces are bevelled are preferably uniform and desir ably in the range of from about 40 to about 50.

Mandrel portion 47 is provided at a point a short dis :e above groove 72 with a pair of external longitudily spaced upper and lower circular shoulders or lugs and 91, respectively, of substantially the same gestric shape in longitudinal cross-section as shoulders and 77 on the slips, having cylindrical outer end faces bevelled upper and lower faces 92 and 93, respecly, on shoulder 90 and upper and lower faces 94 and respectively, on shoulder 91. Shoulders 90 and 91 ne between them an annular recess 96 having subltially the same length as recesses 80 in the slips.

"he dimensions and relative positions of shoulders 90 91 and shoulders 76 and 77 on slips 35 are such that respective shoulders may move longitudinally relato each other in response to relative movement been the mandrel and the slips between positions at ch shoulders 90 and 91 are in direct registration with ulders 76 and 77 (FIGS. 2 and 4), to thereby radially ject slips 35, and positions providing a relationship :rein shoulders 90 and 91 are interspersed with ulders 76 and 77 to thereby permit inward collapse slips 35 (FIG. 1). In the interspersed relationship, ulders 90 and 91 may move between positions above G. 3) and below (FIG. 1) the respective shoulders and 77, as will appear subseqeuntly in the descript of the operation of the device.

.anding and retrieving section 21 includes a tubular ve 100 having a bore 101 opening to its lower end, bore having a diameter such as to slidably receive tally enlarged section 52 of mandrel plug 51. The er end of sleeve 100 is internally threaded to receive tbular bushing 103 having a bore dimensioned to slid- I receive the upper end portion of mandrel section 46. :oil spring 105 is positioned about the upper end of idrel section 46 in compression between shoulder 53 the inner end of bushing 103, thereby normally biasmandrel 45 upwardly relative to sleeve 100 and anring section 20. A pair of seal rings l06106 are lnted in the bore wall of bushing 103 to form spaced able seals between bushing 103 and the exterior of idrel section 46. Adjacent its lower end, the wall of hing 103 is provided with radial ports 107 providing tmunication between the interior and exterior of the hing. Mandrel section 46 is provided with a radial port providing communication between mandrel bore 48 the exterior of the mandrel and which is adapted ve positioned in registration with ports 107 at certain tive positions of the mandrel and out of registration l ports 107 at other relative positions of the mandrel, will appear hereinafter. The upper end portion of ve 100 is reduced in external diameter to form a fishneck 110 having a radial flange 111 at its upper end adapted to be grasped by a conventional overshot aimilar fishing tool. Fishing neck 110 has an axial 110:: which is substantially flush with the wall of :et 540. An internal annular shoulder 112 is formed ore 101 of sleeve 100 at a point near its upper end the inner wall of shoulder 112 is provided with a low annular groove 113. A plurality of ball detents are circumferentially disposed in ball-holding pockets extending through the wall of socket 54. The inner of pockets 116 are dimensioned to permit only a ion of detents 115 to project into socket 54a and the neters of detents 115 are made greater than the thickof the wall of socket 54a so that a portion of the nts will also project outwardly of the ball pockets be engaged in groove 113 when the latter is in regison with the detents, as best seen in FIGS. 1, 2 and 3. or more shear pins 117 extend through the wall of ve 100 into enlargement 52 to thereby lock these s together in the positions shown in FIGS. 1, 2 and 3. parts are re-releasable for relative movement by .king of the shear pins, as will appear subsequently. running tool T, which is adapted to be run on a wire tool string or the like, has a cylindrical shank 120 ing an external diameter such as to slide freely through bore a and into socket 54a. A downwardly facing shoulder 121 is provided at the juncture of shank 120 to tool T which is adapted to engage the upper end of flange 111, thereby limiting downward movement of tool T into sleeve 100. Adjacent its lower end, shank 120 is provided with a shallow annular recess 122, the upper and lower ends of which are defined by bevelled shoulders 123 and 124. The depth of recess 122 and of groove 113 are dimensioned relative to the diameter of detents so that when groove 113 is in registration with detents 115, the latter will project into recess 122 and groove 113. Any tendency to upward movement of shank relative to socket 54a and sleeve 100 will dispose the inclined shoulder 124 against the projecting portion of detents 115, as seen in FIG. 2, urging the detents outwardly of pockets 116 and into groove 113. The depth of the latter is made such that detents 115 cannot move outwardly far enough to allow shoulder 124 to pass the detents 115 and thus release shank 120. As a result, detents 115 cooperate with the shank to effectively connect the device to the running too]. Relative downward movement of shank 120 will allow detents 115 to move into recess 122, a distance suflicient to allow shoulder 112 in sleeve 100 to clear the detents and move below the same, in which position detents 115 will be free to fall outwardly into the upper portion of bore 101 above shoulder 112, as best seen in FIG. 4, bore 101 thereby releasing the detents from their engagement with shank 120 and permitting the running tool to be withdrawn from the anchoring structure, as will appear more fully hereinafter.

Operation of the device is as follows: In FIG. 1, the structure is shown with the parts in the relative positions occupied when running the tool into pipe string 10. Running tool T will be secured in socket 54a and as the device is run into the well the friction of packing 32 against the wall of the landing nipples and fluid drag will cause shoulder 121 to bear against the upper end of flange 111, thereby pushing the anchoring device downwardly through the bore of the pipe string. It will be seen that shoulders 90 and 91 are interspersed with shoulders 76 and 77, being disposed, respectively, beneath the latter. Ports 108 and 107 will be in registration so that any fluid in the pipe string will be displaced through the bore of the mandrel by the downward movement of the tool and can flow out of the interior of the mandrel into the bore of the pipe string. As seen in FIG. 1, the tool is shown in a position at which slips 35 are passing below one of the locking grooves 17 in a landing nipple 11. As seen, slips 35 are in the collapsed position and thus may freely pass through the bore of the tubing and the landing nipples, and thus may be moved past any number of such landing nipples and their respective locking grooves until the tool has attained a position below the particular locking groove at which it is to be anchored. Thereupon, an upward pull is taken on the string. As the slips come to a position directly opposite the groove 17, as shown in FIG. 2, the slips will be free to move outwardly into the groove and the friction between packing 32 and the wall of the landing nipple will permit an amount of upward movement of mandrel 45 relative to slip cage 29, allowing shoulders 90 and 91 to move upwardly past respective shoulders 76 and 77 on the slips, as shown in FIG. 2, to the position illustrated in FIG. 3, at which shoulders 90 and 91 will be above and resting on the respective shoulders 76 and 77. At the same time, the upward movement of the mandrel will move groove 72 upwardly in registration with retainer ring 74, permitting the latter to be collapsed by garter spring 75 into groove 72 limiting longitudinal travel of the mandrel to the distance between shoulders 73 and 73a. Spring 63 will be compressed tending to urge mandrel 45 and anchoring section 20 apart, and thus provide a so-called cocking force tending to move shoulders 90 and 91 back toward their former positions below shoulders 76 and 77.

The tool string will now again be lowered, with packing 32 providing friction drag against the wall of landing nipple 11 and resisting movement of body 22 through the nipple, until slips 35 are again opposite groove 17 at which point the slips, being free to move into groove 17, will allow shoulders 90 and 91 on the mandrel to move downwardly under the force of spring 63 and the weight of the tool string until shoulders 90 and 91 are in registration with shoulders 76 and 77, as shown in FIG. 4. The downward movement of the mandrel is limited by the engagement of shoulder 73 with the upper end of retainer ring 74 to thereby hold shoulders 90 and 91 in the position registering with shoulders 76 and 77 and the tool will thereby be anchored in groove 17. At the same time, latching groove 67 will be moved to a position in registration with detents 66 and the latter will project into groove 67 under the pressure of spring 63 and thereby lock the mandrel against upward movement relative to the anchoring section and complete the latching of the tool in the landing nipple. Detents 66 become efiective for holding the mandrel against upward movement by reason of the balancing pressures provided by ports 69, which thus permits the same pressure to be exerted both against the mandrel and against the detents through the sliding piston 60.

When the tool has reached the landing position, as just described, a jarring blow will be struck downwardly on the running string sufficient to break shear pin 117 and thereby permit sleeve 100 to move downwardly until the lower end of the sleeve is in abutting engagement with the upper end of cap 58, as best seen in FIG. 4. This movement of sleeve 100 will move seal rings 106-106 to a position sealing off ports 108 from ports 107 and thus effectively seal off the bore of the mandrel from the interior of tubing T and complete the setting of the tool. With shear pin 117 broken, spring 105 will act to keep sleeve 100 in its downward position, keeping ports 108 isolated by seals 106-106.

When sleeve 100 has moved to the position shown in FIG. 4, detents 115 will be released for movement outwardly into the upper portion of bore 101, thereby freeing shank 120 of the running tool and allowing the latter to be drawn upwardly out of socket 54a, thereby permitting the running string to be withdrawn from the well, as illustrated in FIG. 4.

When the tool is in the set position (see FIG. 4) a higher differential pressure from below the tool will act upward on the cross-sectional area of the mandrel defined by seal 71. This force would tend to move the mandrel upward which would unset the tool. To counteract this force the pressure enters ports 69 and then acts downward on the shoulder 57 which has the same area as the cross-section defined by seal 71. Therefore, the mandrel is pressure balanced and the resultant force on the mandrel is zero.

When it is desired to remove the anchoring device from the landing nipple, a tool string will be run back into the well carrying a suitable and generally conventional overshot for grasping flange 111 of fishing neck 110. Upward pull on the tool string will then raise sleeve 100 back to a position which will again uncover ports 108, permitting bleed-off of pressure through ports 108 and 107 to thereby permit the tool to be released. The latch formed by detents 66 and groove 67 will hold mandrel 45 stationary while sleeve 100 is thus being pulled upwardly to effect the described pressure release. When pressure has thus been bled-off, continued upward pull applied to flange 111 of the fishing neck will pull mandrel 45 upwardly, moving shoulders 90 and 91 upwardly to the position shown in FIG. 3, thereby permitting the slips 35 to collapse inwardly and freeing them from groove 17. As upward pull is continued to be applied to the mandrel, shoulder 90 will engage beneath shoulder 43, thereby securing the mandrel to the anchoring section and permitting the entire anchoring tool to be withdrawn from the landing nipple and thence through the tubing string to the surface.

It will be seen that when sleeve member has been moved to its lowermost position, as shown in FIG. 4, the anchoring device may serve as a plug for the tubing string, since all communication between the interior ol the mandrel and the exterior of the tool has been sealed off above the principal seal provided by packing 32.

FIG. 10 illustrates a modification of the anchoring structure in accordance with this invention, which is designed for use in a tubing string which has been installed without the use of specially grooved landing nipples. This embodiment provides a structural form which enables the anchoring device to be anchored in the collar recesses formed at the joints defined between the ends of adjoining sections of the tubing string which are threadedly connected together by means of conventional threadec' collars.

As illustrated in FIG. 10, two sections 10a and 10b 01 the tubing string are shown connected by a conventional threaded collar C. The ends of the adjoining tubing sections are spaced apart in the normal manner by the space 17a which, for the purposes of this invention, functions in the same manner as groove 17 of a landing nipple.

The details of the anchoring device employed for use in this modification are identical with those of the previously described embodiments, with the exception of the external shape of slips 35. In the modification illustrated in FIG. 10, slips 35 are identical with slips 35 ir their internal construction in having shoulders 76' am 77 substantially identical in form and arrangement witl' shoulders 76 and 77 of the previously described embodiment. However, the exterior surface of each of the slip: 35 is provided at a medial point thereon with a transverse external shoulder 41 which is trapezoidal in longitudina section defined by the converging upper and lower edge: 83' and 84'. Shoulders 41' have a length such as to be slightly less than the length of recess 17a, so that the will project into the latter and engage the ends of the connected tubing sections 10a and 10b for securing th: anchoring device in the recess in response to the sam: manipulative movements employed in activating the pre viously described embodimnet.

From the foregoing, it will be seen that the dcvict heretofore described provides a structure adapted to ful fill the various objects and advantages which have beer previously noted. It will be evident that in cases when the device is to function solely as an anchor, seal pack ing 32 may be dispensed with, if no scaling function it required.

It will be understood that numerous changes and modi fications may be made in the details of the illustrative embodiment within the scope of the appended claim: without departing from the spirit of this invention.

What we claim and desire to secure by Letters Paten is:

1. For use in pipe strings having longitudinally spacer annular recesses in the wall thereof, an anchoring devic: anchorable in a selected one of said recesses, comprising a tubular body insertable in the bore of a pipe string openings in the Wall of said body, latch members mount ed in said openings for radial movement into and out 0: said recesses, said latch members having inwardly pro jecting shoulder means, a mandrel disposed in the bore 0' said body for longitudinal movement relative thereto radial enlargements on the mandrel movable with lht mandrel relative to the latch members between position: in and out of registration with said shoulder means whereby respectively to radially project said latch mem bers into said recesses and to release said latch member: for retraction from said recesses, cooperating stop mean: carried by the body and the mandrel limiting the rela tive movement of the mandrel to attainment of said po sitions, cooperating releasable latch elements positioner on the body and mandrel to releasably secure sajd man drel to the body when said shoulder means is in registra tion with the shoulder means on said latch members, am

mm for applying upward pull on said mandrel to retse said latch elements and to move said enlargements t of registration with the shoulder means on said latch :mbers, whereby to release said device for withdrawal am said pipe string. 2. An anchoring device according to claim 1 wherein (I stop means comprises an annular groove in the exior of said mandrel defining longitudinally spaced )ulders, and a stop member mounted on the body to )jfiCt into said groove for alternate engagement with d shoulders. 5. An anchoring device according to claim 2 wherein d stop member comprises a segmented ring resiliently sed to radially collapse into said groove between said uulders. 1. An anchoring device according to claim 1 wherein 1 releasable latch elements comprise an annular groove the exterior of said mandrel, and ball detents mounted the body and resiliently biased to enter said groove en in registration therewith. 5. An anchoring device according to claiml having seal ans mounted about the exterior of said body to seal ween the body and the wall of the pipe string, and co- :rating passages in the mandrel and body arranged to by- :s fluid around said seal means. i. For use in pipe strings having longitudinally spaced iular recesses in the wall thereof, an anchoring device :horable in a selected one of said recesses, comprising, ibular body insertable in the bore of a pipe string, opens in the wall of said body, latch members mounted in 1 openings for radial movement into and out of said esses, said latch members having inwardly projecting ulder means, a mandrel disposed in the bore of said ly for longitudinal movement relative thereto, the upper l portion of the mandrel extending above the upper l of the body and having a closure member closing off bore of the mandrel, radial enlargements on the ndrel movable with the mandrel relative to the latch mbers between positions in and out of registration with l shoulder means, whereby respectively to radially ject said latch members into said recesses and to release I latch members for retraction from said recesses, crating stop means carried by the body and the mandrel iting the relative movement of the mandrel to attainit of said positions, cooperating releasable latch eleits positioned on the body and mandrel to releasably ire said mandrel to the body when said shoulder means n registration with the shoulder means on said latch nbers, and sleeve means slidably disposed about said er portion of the mandrel and engageable therewith applying upward pull on said mandrel to release said h elements and to move said enlargements out of stration with the shoulder means on said latch meml, whereby to release said device for withdrawal from i pipe string. An anchoring device according to claim 6, wherein l upper portion of said mandrel has port means through wall thereof, and said sleeve means carries valve ins movable between positions opening and closing l port means. An anchoring device according to claim 6, wherein 1 stop means comprises an annular groove in the ex- )r of said mandrel defining longitudinally spaced ulders, and a stop member mounted on the body to project into said groove for alternate engagement with said shoulders.

9. An anchoring device according to claim 6, wherein said releasable latch elements comprise an annular groove in the exterior of said mandrel, and ball detents mounted in the body and resiiiently biased to enter said groove when in registration therewith.

10. An anchoring device according to claim 6, having seal means mounted about the exterior of said body to seal between said body and the wall of the pipe string, and cooperating passages in the mandrel and body arranged to by-pass fluid around said seal means.

11. For use in pipe strings having longitudinally spaced annular recesses in the wall thereof, an anchoring device anchorable in a selected one of said recesses, comprising, a tubular body insertable in the bore of a pipe string, openings in the wall of said body, latch members mounted in said openings for radial movement into and out of said recesses, said latch members having inwardly projecting shoulder means, a tubular mandrel disposed in the bore of said body for longitudinal movement relative thereto and defining an annular chamber between the mandrel and the body closed at its opposite ends, radial enlargements on the mandrel movable with the mandrel relative to the latch members between positions in and out of registration with said shoulder means, whereby respectively to radially project said latch members into said recesses and to release said latch members for retraction from said recesses, cooperating stop means carried by the body and the mandrel limiting the relative movement of the mandrel to attainment of said positions, cooperating releasable latch elements including detent means positioned in said chamber and a detentreceiving groove positioned on the mandrel to releasably secure said mandrel to the body when said shoulder means is in registration with the shoulder means on said latch members, port means through the wall of the mandrel providing communication between the bore of the mandrel and the interior of said chamber below said detent means, and means for applying upward pull on said mandrel to release said latch elements and to move said enlargements out of registration with the shoulder means on said latch members, whereby to release said device for withdrawal from said pipe string.

12. An anchoring device according to claim 11, wherein said detent means comprises a plurality of annularly arranged ball elements, a piston member slidably disposed in said chamber beneath said ball elements, and spring means resiliently urging said piston member into engagement with said ball elements to urge the latter outwardly toward said detent-receiving groove.

13. An anchoring device according to claim 11, wherein the area of the mandrel and the area in said chamber exposed to fluid pressure entering the chamber through said port means from the bore of the mandrel are equal whereby to balance the pressure across the mandrel.

References Cited in the file of this patent UNITED STATES PATENTS 2,953,206 Brown Sept. 20, 1960 2,976,931 Daf'lin Mar. 28, 1961 2,980,185 Daffin Apr. 18, 1961

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2953206 *Aug 8, 1955Sep 20, 1960Cicero C BrownBridging plug
US2976931 *Feb 20, 1956Mar 28, 1961Camco IncWell connector device
US2980185 *Jul 11, 1958Apr 18, 1961Camco IncRetrievable well tool hanger
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3288493 *Feb 28, 1964Nov 29, 1966Brown Oil ToolsCoupling device for underwater wellheads
US3434293 *May 8, 1967Mar 25, 1969Brown Oil ToolsFloatable base for marine drilling platform and method of operation
US3461962 *Jun 22, 1967Aug 19, 1969Harrington James WPipe string fill-up tool
US3497009 *Jan 13, 1969Feb 24, 1970Harrington James WCirculating tool
US3568770 *May 22, 1969Mar 9, 1971Otis Eng CoLatch device for supporting well tools in a flow conductor
US3661218 *May 21, 1970May 9, 1972Brown Cicero CDrilling unit for rotary drilling of wells
US3990510 *Nov 18, 1974Nov 9, 1976Decuir Perry JReleasable well anchor tool
US4018275 *May 12, 1976Apr 19, 1977Gaut Robert TAnchoring device for well tools
US4396061 *Jan 28, 1981Aug 2, 1983Otis Engineering CorporationLocking mandrel for a well flow conductor
US4479539 *Oct 18, 1982Oct 30, 1984Otis Engineering CorporationDownhole lock system
US4510995 *Feb 22, 1983Apr 16, 1985Baker Oil Tools, Inc.Downhole locking apparatus
US4583591 *Dec 31, 1984Apr 22, 1986Baker Oil Tools, Inc.Downhole locking apparatus
US6202746Sep 23, 1998Mar 20, 2001Dresser Industries, Inc.Fail-safe coupling for a latch assembly
US6997252 *Sep 11, 2003Feb 14, 2006Halliburton Energy Services, Inc.Hydraulic setting tool for packers
US8596350 *Jan 25, 2011Dec 3, 2013Baker Hughes IncorporatedLock mandrel load distribution apparatus
US9217316 *Jun 13, 2012Dec 22, 2015Halliburton Energy Services, Inc.Correlating depth on a tubular in a wellbore
US20040055757 *Aug 6, 2003Mar 25, 2004Baker Hughes IncorporatedLocking apparatus with packoff capability
US20050056417 *Sep 11, 2003Mar 17, 2005Porter Jesse C.Hydraulic setting tool for packers
US20120186805 *Jan 25, 2011Jul 26, 2012Baker Hughes IncorporatedLock Mandrel Load Distribution Apparatus
US20130333883 *Jun 13, 2012Dec 19, 2013Halliburton Energy Services, Inc.Correlating depth on a tubular in a wellbore
Classifications
U.S. Classification166/217, 166/237, 285/920
International ClassificationE21B23/02
Cooperative ClassificationE21B23/02, Y10S285/92
European ClassificationE21B23/02