US3020958A

US3020958A - Well tool

Info

Publication number: US3020958A
Application number: US743697A
Authority: US
Inventors: John W Kenneday
Original assignee: Jersey Production Research Co
Current assignee: Jersey Production Research Co
Priority date: 1958-06-23
Filing date: 1958-06-23
Publication date: 1962-02-13
Anticipated expiration: 1979-02-13

Description

Feb. 13, 1962 J. w. KENNEDAY 3,020,958

WELL TOOL Filed June 25, 1958 3 Sheets-Sheet l 1l, an wiulv LP 4M' TM ATTR NEY.

WELL TOOL 3 Sheets-Sheet 2 Filed June 25, 1958 FIG. IO.

INVENTOR.

ATTORNEY.

FIG. 9.

FIG. 8.

J. W. KEN NEDAY Feb. 13, 1962 WELL TOOL 3 Sheets-Sheet 3 Filed June 25, 1958 iin- ATTORNEX United States Patent 3,020,958 WELL TOOL John W. Kenneday, Houston, Tex., assigner, by mesne assignments, to Jersey Production Research Company, Tulsa, Okla., a corporation of Delaware Filed June 23, 1958, Ser. No. 743,697 9 Claims. (Cl. 166-118) This invention relates to tool-s for carrying out workover operations ina well, such as sand washing operations.

The device to be described herein has particular use with wells having a tubing arranged therein. The tubing may have its lower end positioned above the bottom ot the well. By so positioning the tubing, exten-sion members may be run by wireline or other conventional means down the tubing. The extension members extend below the lower extremity of the tubing. Hence, workover operations can be conducted below the lower extremity of the tubing which may be permanently arranged.

In carrying out certain workover operations, such as sand washing, a tubular extension is lowered down the tubing. The well is then reverse circulated, that is, fluid is owed down the tubing-casing annulus and up the tubular extension and tubing. The undesired sand in the well land tubing is thus removed to the surface.

'Ihe present invention provides novel means for latching the tubular extension member 25 to the col-lar recess in the tubing above the extension after the extension member has been lowered to the bottom of the well. A sleeve member 27 is provided on the upper section of the tubular extension member. The sleeve member is movable axially on the extension member. The latching means, such as latch dogs, are pivotally connected to the upper part of the sleeve member. A cup packer 29 is mounted to the sleeve member. Hence, upon reverse circulation the sleeve member moves upwardly on the extension member. With this upward movement of the sleeve member, the latching means engage the collar recess to lock the extension member `against upward movement.

Means are provided in the sleeve to prevent the tubular extension member from moving upwardly like -a piston due to the reverse circulation. This means preferably takes the form of at least one leaf spring having at least one locking shoulder. A circular shoulder is provided on the extension member in such a position that upon reverse circulation the locking shoulder will be moved into contact with the circular shoulder on the tubular extension member, thus preventing further upward movement of the extension member.

To unlock the latching dogs, direct circulation is started; that is, circulation down the tubing and then up the tubingcasing annulus. The direct circulation moves the sleeve member downwardly with respect to the tubular extension to unlatch the latch-ing dogs.

In case of malfunction, provision is made in my new device to positively retract the latching dogs. A latch retracting means is connected to the slidable fishing neck. The latch retracting means is connected to the extension member by a frangible member, such as a shear pin. In the case of malfunction, the fishing neck is jarred upwardly. The shear pin is broken and the latch retracting means moved upwardly to positively retract the latching dogs.

Often, the material to be removed becomes packed. Packed material, such as sand, is not easily removed by reverse circulation. One embodiment disclosed herein includes a means permitting the loosening of the material to be removed. Collar lock dogs are provided in this embodiment. The collar lock dogs are in addition to the latching dogs. A vcollar lockr dog actuating member for each lock dog is connected to the slidable tishng neck. If the reverse circulation does not result in the desired removal of sand or debris, the fishing neck can then be driven downward while reverse circulating so that the collar lock dogs are expanded into the collar recess. Reverse circulation can then be ceased, and direct circulation employed to jet down into the sand or debris to loosen the sand or debris. Reverse circulation can then be renewed to remove the sand or debris.

From the foregoing it is seen that this invention includes a no-vel means for latching an extension member in a collar recess of the tubing, means for positively retracting the latches in case of malfunction of the device during normal operations, and in one embodiment, means permitting the jetting of liuids against the sand or debris to loosen `said sand or debris if it 'should be so firmly packed as to not permit effective removal by reverse circulation.

The invention, as well as its many advantages, will be further understood by reference to the following detailed description and drawings, in which:

FIG. l is an elevational view showing the extension member latched in position in a collar recess in the tublng;

FIG. 2 is an elevational View showing the extension member lowered to a. point below the next collar reces to that shown in FIG. 1;

FIG. 3 is an elevational view showing the extension member latched in position in the next lower collar recess of the tubing;

FIG. 4 is an elevational view, partly in section, showing in detail the new device when the extension member is in the unlatched position;

FIG. 5 is an elevational view, partly in section, showing in detail the device of FIG. 4 latched ina tubing collar recess; FIG. 6 is a view taken along lines 6 6 of FIG.'4;

FIG. 7 is a view taken along lines 7 7 of FIG. 4;

FIG. 8 isa view taken along lines 8 8 of FIG. 4;

FIG. 9 is a view taken along lines 9 9 of FIG. 5;

FIG. 10 is an elevational sectional view showing the mandrel used in the device of FIGS. 4 and 5;

FIG. ll is a view taken along lines 11 11 of FIG. 10;

FIG. 12 is an elevational view showing a second embodiment of the invention with the extension member in the unlatched position;

FIG. 13 is `an elevational view, partly in section, showing in detail the latching means of the deviceof FIG-12;

FIG. 14 isan elevational view, partly in section, show,- ing the apparatus for operating the collar lock dogs of the embodiment of FIGS. l2 and 13, with a section tubing 21 is positioned above the bottom of the well.

It is desired to remover material from the borehole and tubing. This material, here represented as sand; is

shown by numeral 24.. To remove the sand.24, a tubular' extension member 2e' is lowered by means of a running tool 33 down to the desired position within the tubing 21..

The extension member 25 includes a'telescopic section 26. Disposed about the extension member 25 is an elongated sleeve member 27, containing at its upper end a pair of latching dogs 28. A cup packer 29 is integrally mounted to the sleeve member 27. The tubular exten- The tubing string may be made upl sion member also has mounted adjacent its upper end a mand-rel 30, having ports 39 formed therein. A iishing neck 31 is provided at the upper end of the extension member.

FIGS. 1 to 3, inclusive, show the steps followed in removing the sand 24. FIG. 1 shows the extension member 25 locked in position within the collar recess formed by collar 22. The telescopic section 26 is in the extended position against the sand 24. Sand is then removed by reverse circulation until the extension member 26 has beenA fully extended. In order to remove more sand from the borehole, the running tool 33 connected to the end of a wire line 32 is lowered to a position below the collar recess formed by threaded collar 23 after the latching dogs have been unlatched. This position is shown in FIG. 2. The telescopic section 26 is then in its fully retracted position within extension member 25. Reverse circulation is then started, and the running tool 26 is moved upwardly and the latching dogs 2S latched into the recess formed by collar 23. This position is shown in FIG. 3. The sand is then further removed by reverse circulation. That is, uid is owed down the tubingcasing annulus, up the telescopic section 26 and extension member 25, through ports 39, and on up to the surface through tubing 21.

Referring to FIGS. 4 through 11, the detailed structure of the elongated sleeve member, mandrel, and fishing neck is shown. FIG. 4 shows the relative positions of the parts with the extension member in the unlatched position within the tubing 21, and FIG. 5 shows the positions of the parts with the latching dogs 28 in the latched position within the collar recess, such as collar recess 23. A plurality of leaf springs 49 Vare mounted within the elongated sleeve member 27. These leaf springs are flexible and normally biased outwardly. However, with the application of pressure from the bottom of the well, the leaf springs are curved inwardly, as shown in FIG. 5. Each of the leaf springs 49 has at least one locking shoulder 41 extending perpendicularly from the axis of the leaf spring. A plurality of locking shoulders are shown in the figures. The leaf springs are imbedded in the sleeve member 27 below the integrally attached cup packer 29.

Latching dogs 28 are -attached to the upper portion of the sleeve member 27 by means of pivot pins 42 disposed within recesses formed in the sleeve member 27. The latching dogs are guided outwardly upon upward movement of the sleeve member 27.

A plurality of ports 43 are formed within the sleeve member 27 at a point above the cup packer 29. The ports 43 place the inside portion of the leaf springs 4t? in Huid communication with the fluid pressure within the tubing 21 and above the packer 29 through space 44. To latch the latching dogs 28 in the collar recess, reverse circulation is applied as the extension member is pulled upwardly by the running tool. The pressure below the cup packer 29 moves the axially slidable sleeve member 27 upwardly along the extension member, and the leaf springs 40 inwardly against the outside portion of the extension member 25. Latching dogs 28 are guided in their outward movement against the collar recess by the tapered portion of concave cone segments 46. The sleeve member is kept from rotating about the tubular extension member by means of a guide pin 47 connected to the tubular extension member 2S and extending into a slot 48 formed in the inside periphery of the sleeve member 27.

The extension member 25 is prevented from moving upwardly like a piston in response to the reverse circulation, by the provision of a recess formed therein to provide a circular shoulder 49. When the springs 4t) are biased inwardly by reverse circulation, one of the locking shoulders 41 will be engaged by the tubular extension member shoulder 49, thus preventing upward movement of the extension member.

The latching dogs 28.may be unlatched by the application of direct pressure down the tubing 21. The fluid pressure communicates through ports 43 and space 44 to the springs 40. The springs are thus returned to the position shown in FIG. 4, and the sleeve member 27 moved axially downward with respect to the tubing extension member to unlatch the dogs 28.

The mandrel 30 s integrally connected to the upper portion of the tubular extension member 25 which forms a part of the mandrel. Diametrically oppositely placed elongated cut-outs are provided in the mandrel 310. rI`he mandrel also includes an upper ring portion 51 provided with diametrically opposite elongated cut-outs 52 (see FIG. 7). The cut-

outs

50 and 52 extend along substantially the same longitudinal plane as the latching dogs 28.

A pair of cone supports 53 are threadedly connected to the fishing neck 31 and extend through the cut-outs 52 in the ring portion 51. The cone supports 53 support the segmented concave cones 46. The tapered portion of each concave cone is slotted to receive a rocker arm 54 which is pivotally mounted within the slotted portion. The other extremity of the rocker arm 54 is adapted to slidably move within slots 5S provided in the latching dogs 28.

Frangible means, such as a shear pin 56, interconnects each cone support 53 to the ring portion 51 of the mandrel 3i). During normal operations, the latching dogs 28 are unlatched by application of direct pressure down the permanently arranged tubing 21 in the manner formerly described, However, in the case of malfunction, a positive retracting means is provided to positively retract the latching dogs 28. This is done by jarring the fishing neck upwardly to break the shear pin 56. Further upward pulling moves the slidable fishing neck with its attached cone supports and concave cone segments upwardly. The rocker arm 54 interconnecting the tapered portion of cone lsegments 46 with the latching dogs 28 then positively retracts the latching dogs from the collar recess as the cone segments move upwardly with the fishing neck.

In operating the embodiment shown in FIGS. 1 through l1, the extension member 25 is lowered by means of a running tool 33 connected to wire line 32 to the bottom of the borehole. Reverse circulation is then begun and,

if necessary, the extension member 25 pulled upwardly to move the latching dogs 28 into the next upward collar recess. The reverse circulation moves the sleeve member 27 upwardly to securely latch the latching dogs in the collar recess. The pressure also bends the spring members 4t), as shown in FIG. 5, so that the locking shoulders 41 are in engagement with the shoulder 49 provided in the extension member 25. This prevents unwanted upward movement of the extension member. After the telescopic section 26 has been fully extended, direct circulation is applied down the permanently arranged tubing 21, through the port 43, sleeve member 27, and against the inside of the leaf springs. The leaf springs are thus returned to their original positions, the sleeve member 27 moved downwardly with respect to the extension member, and the dogs 28 unlatched- The extension member is then moved downwardly to the position shown in FIG. 2, and reverse circulation again applied to latch the latching dogs in the next lower collar recess, as shown in FIG. 3. If, for some reason, the latching dogs are not unlatched or not fully unlatched, the pulling tool is jarred upwardly to break the shear pin 56. Further upward movement of the fishing neck 31 positively unlatches the latching dogs 28.

A second embodiment of my invention is shown in FIGS. 12 through 16. An elongated sleeve member 60 is mounted for slidable movement along the extension member 61. Attached to the sleeve member is a downwardly facing cup packer 62. Pivotally connected to the recesses formed in the top of the sleeve member 60 by means of pivots d3 are latching dogs 64. Ports 65 are provided in the sleeve member 60 and disposed above the downwardly facing cup packer 62.

The internal structure of the sleeve member 60 and its associated parts is not shown in FIGS. 12 through 16. However, the internal structure is exactly the same as the internal structure of the sleeve member 27 and its associated parts, described in relation to FIGS. 1 through 1l.

The extension member is lowered down the tubing 21. The extension member is then raised while reverse circulation is applied. The reverse circulation moves sleeve member 60 upwardly to latch latching dogs 64 in the collar recess. The locking shoulders on the leaf springs contained in sleeve member 60 engage a circular shoulder made in the extension member 61.

When it is desired to unlatch latching dogs 64, direct circulation is applied through ports 65 and against the inside of the leaf springs contained within sleeve member 60. The sleeve member 60 is then moved downwardly and the latching dogs unlatched.

A mandrel '66 is connected to the upper part of the extension member 61, with the upper portion of the extension member forming a part of the mandrel. The mandrel includes a downwardly extending cylindrical member 67 which is integrally connected to the upper portion of extension member 61.

Two diametrically spaced elongated cut-outs 68 are provided within the mandrel 66. The cut-outs 68 are along substantially the same longitudinal plane as the latching dogs 64. A pair of concave cone segments 69 are mounted for possible movement along the cut-out portions 68. The cone segments 69 are supported by a circular cone support 70, having at its upper extremity a pair of lugs 71 which extend over and rest upon the upper extremity of extension member 61. Cone support member 70 is shear-pinned to the mandrel 66 by a shear pin 72. l

The tapered portions of the concave cone segments 69 are provided with slots 73. Rocker arms 74 are pivoted within the slots '73 by pivot pins 75. The other end of rocker arm 74 slides within a slotted portion 76 of latching dogs 64.

A pair of diametrically spaced openings 77 are provided in the downwardly extending cylindrical portions 67 of the mandrel 66. These openings are preferably separated from the elongated cut-outs 68 by a 90 arc. Mounted for movement within the openings 77 are a pair of locking dogs 7 S. Each locking dog 78 is normally biased in wardly by a coil spring 79 disposed within recesses formed in the cylindrical member 67 and locking dogs 78. Locking dogs 78 taper upwardly with the tapered kportion being fitted with a groove S adapted to receive a track 80 on the tapered portion of each collar locking, dog actuating, concave cone segments 81. The cone segments 81 are integrally connected to a slidable fishing neck 82 provided with fluid ports 83. The cone segments 81 are provided with outwardly extending shoulders 100 in engagement withthe circular cone support 70.

As formerly stated, it often occurs that the desired removal of sand is not accomplished byreverse circulation because of the packed condition of the sand or debris within the borehole. When this situation arises, the slidable fishing neck 82 is jarred downwardly by jarring tool 33. This downward jarring moves the cone segment 81 vdownwardly and expands the locking dogs 78 into the recess of collar 23 against the bias of coil springs 79. Fluid is lthen jetted through ports 83 and extension member 61 directly against vthe sand or debris. To direct the pressure of the direct circulation through the tubular extension 61, rather than in the extension member permanent tubing annulus, an upwardly facing cup packer 84 is provided, During direct circulation or jetting, the sleeve member 60 is moved downwardly to unlatch latchling dogs 64; however, the locking dogs 78 keep the extension member 61 locked in the recess of collar 23.

6 After the sand or debris has been loosened, reverse crculation can be resumed by pulling :upwardly on the slidable fishing neck 82 during reverse circulation to retract the locking dogs 78 and again latch the latching dogs 64.l The sand or debris is removed up the extension member 61 through ports 83 and on -up to the surface.

in utilizing the embodiments shown in FIGS. l2 through 16, the steps performed are similar to the steps performed using the embodiments shown in FIGS. 1 through 11. The tool is first lowered to a point below the desired collar recess. Reverse circulation is then begun as the tool is moved upwardly, to move the sleeve member 6i) upwardly and thus latch the latching dogs 64 to the desired collar recess. After the telescopic section connected to the extension member has been fully extended, direct circulation is begun to move the sleeve 60 downwardly and unlatch the latching dogs 64.

If, for some reason, the latches should not become fully unlatched, the running tool is jarred upwardly. When upward jarring occurs, the shoulders of the cone segments 81 exert force against the upper portion of the cone supports 70 to break the shear pins 72. The concave cone segments 69 are then slidably moved upwardly within the cut-out portions 68 and the latching dogs 64 positively retracted.

The device is removed to the surface after the workover operations have been completed by pulling up on the slidable fishing neck 82. The upward pulling causes the cone support member 71 to engage the ring portion of the mandrel 66. Since the mandrel 66 is integrally connected to the extension member 61, the extension member is moved to the surface.

It is to be understood that various modifications and changes may be made to the disclosed embodiments herein without departing from the scope of the appended claims. For example, the devices may be employed in tubing not permanently arranged in a well, such as a drill pipe.

I claim: p

1. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced internal recesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular extension' member and slidable axially with respect to the tubular extension member and including, as a portion thereof, at least one leaf spring having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs, said packer being adapted to force the leaf spring locking shoulders against the tubular extension member shoulder during reverse circulation; at least one latching dog pivotally connected to the upper portion of the sleeve member; and guide means mounted on the tubular extension member for forcing the latch dog outwardly against the inside of the tubing upon upward movement of the sleeve -member when reverse circulation is initiated whereby when the tubular extension member is lowered to the bottom of the well and the latch dog disposed adjacent lto a said recess, initiation of said reverse circulation will move the sleeve member upwardly and force 4the latehingdog into said recess and the leaf spring locking lshoulder against the tubular extension member shoulder.

2. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced collar internal re-y cesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member and including, as a portion thereof, leaf springs each having at least one locking shoulder to prevent upward movement of the tubular exf tension member by engaging said circular shoulder during reverse circulation; `a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at least one point formed in .the sleeve member whereby fluid owed through the port during direct circulation equalizes the pressure across the leaf springs and disengages the leaf spring locking shoulders from the tubular extension member circular shoulder; collar recess latches connected to the upper portion of the sleeve member; a slidable fishing neck; latch retracting means connected to the fishing neck and to the latches; and frangible means connecting the latch retracting means to the extension member whereby when the tubular extension member is lowered to the bottom of the borehole and the latches disposed adjacent to a said collar recess, reverse circulation will move the sleeve member upwardly and force the latches into said collar recess and the leaf spring locking shoulders against the tubular extension member, and after completion of a wash cycle, terminating the reverse circulation and initiating a direct circulation will unlatch the latches and disengage the leaf spring locking shoulders from the tubular extension member, and in case of malfunction of the latches, the jerking of the fishing neck upwardly will break the frangible means and retract the latches.

3. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced collar internal recesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member and including, as a portion thereof, leaf springs each having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; a pair of diametrically spaced latching dogs pivotally connected to the upper portion of the sleeve member; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at least one port formed in the sleeve member whereby fluid owed through the port during direct circulation equalizes the pressure across the leaf springs to release the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member circular shoulder; a mandrel connected to the upper portion of the tubular extension member; a slidable shing neck; tapered latch retracting means connected to the fishing neck and serving to guide a latching dog during movement of said latching dog into a said recess; latch actuating means interconnecting the latch retracting means and latching dogs; and a frangible means connecting the tapered latch retracting means to the mandrel, whereby when the tubular extension member is lowered into the bottom of the borehole and the latching dogs disposed adjacent to said collar recess, reverse circulation will move the sleeve member upwardly and force the latching dogs into said collar recess by cam action against the tapered means and the leaf spring locking shoulders -against the tubular extension member, and after completion of a wash cycle, terminating the reverse circulation and initiating a direct circulation will unlatch the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member, and in case of malfunction of the latches, the jerking of the shing neck upwardly will break the frangible means and retract the latching dogs.

4. For use in a tubing arranged in a well, said tubing having a plurality of vertically spaced collar internal recesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member and including, as a portion thereof, leaf springs each having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; a pair of diametrically spaced latching dogs pivotally connected to the upper portion of the sleeve member to latch into a said recess upon upward movement of :the sleeve member during reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at least one port formed in the sleeve member whereby uid owed through the port during direct circulation equalizes the pressure across the leaf springs to release the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member circular shoulder; a mandrel connected to the upper portion of the tubular extension member and having at least one port in communication with the tubing-mandrel annulus; a fishing neck; a pair of cone supports connected to the fishing neck; a concave cone segment connected to each cone support and adapted for guided slidable movement within the mandrel, the tapered portion of each concave cone segment serving to guide said latching dog during movement thereof into said recess; latch actuating means interconnecting the concave cone segments and latching dogs; and a shear pin interconnecting each cone support to the mandrel whereby when the tubular extension member is lowered into the borehole, reverse circulation will move the sleeve member upwardly and latch the latching dogs into saidV recess by cam action against the tapered means and the leaf spring locking shoulders against the tubular extension member, and after a completion of a wash cycle, terminating the reverse circulation and initiating a direct circulation will unlatch the latching dogs and disengage the leaf spring locking shoulders, and in case of malfunction of the latching dogs, the jerking of- -the fishing neck upwardly will shear the shear pins land retract the latching dogs.

5f. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced collar internal recesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member and including, as a portion thereof, leaf springs each having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; a pair of diametrically spaced latching dogs pivotally connected to the upper portion of the sleeve member to latch into a said recess during reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at least one port formed in the sleeve member whereby uid flowed through the port during direct circulation equalizes the pressure across the leaf springs to release the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member circular shoulder; a mandrel integrally connected to the upper portion of the tubular extension member, said mandrel having diametrically opposite elongated cut-outs and an upper ring portion having inside diameter cut-outs extending along substantially the same longitudinal and axial plane as the latching dogs, and at least one port in communication with the tubing-mandrel annulus; a fishing neck; a pair of cone supports connected to the fishing neck and extending through the inside diameter cut-outs of the upper ring portion of the mandrel; a concave cone segment connected to each cone support and adapted for slidable movement within the elongated cut-outs in the mandrel, the tapered portion of each concave cone segment serving to guide a latching dog during movement of the latching dog into said recess; latch actuating means interconnecting the concave cone segments and latching dogs; and a shear pin interconnecting each cone support to the ring portion of the mandrel whereby when the tubular extension member is lowered into the borehole, reverse circul-ation will move the sleeve member upwardly and latch the latching dogs into said recess by cam action against the tapered means and the leaf spring locking shoulders against the tubular extension member, and, after completion of a wash cycle, terminating the reverse circulation and initiating a direct circulation will unla-tch the latching dogs and the leaf spring locking shoulders, and in case of malfunction of the latching dogs, the jerking of the shing neck upwardly will shear the shear pins and retract the latching dogs.

6. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced collar internal recesses formed therein: a tubular extension member having a circular shoulder formed on its outer periphery; an elon- -gated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member and including, as a portion thereof, leaf springs each having lat least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; a pair of diametrically spaced slotted latching dogs pivotally connected to the upper portion of the sleeve member to latch into a said recess during reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at least one port formed in the sleeve member whereby `fluid flowed through the port on direct circulation equalizes the pressure across the leaf springs to release the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member circular shoulder; a mandrel integrally connected `to the upper portion of the tubular extension member, said mandrel having diametrically opposite elongated cut-outs and an upper ring portion having inside diameter cut-outs extending along substantially the same longitudinal and axial plane as the latching dogs, and at least one port in communica- .tion with the tubing-mandrel annulus; a fishing neck; a pair of cone supports connected to the fishing neck and extending through the inside diameter cut-outs of the upper ring portion of the mandrel; a concave cone segment connected to each cone support and adapted for slidable movement within the elongated cut-outs in the mandrel, the tapered portion of each concave cone segment being slotted and serving to guide a latching dog during movement of the latching dog into said recess; a rocker arm pivotally mounted in each of said cone segment slots and connected to a latching dog; and a shear pin interconnecting each cone support to the ring portion of the mandrel whereby when the tubular extension member is lowered into the borehole, reverse circulation will move the sleeve member upwardly and latch the latching dogs into Isaid recess by cam action against the tapered means and the leaf spring locking shoulders against the tubular extension member, and, after completion of a wash cycle, terminating the reverse circulation and initiating a direct circulation will unlatch the latching dogs and the leaf spring locking shoulders, and in case of malfunction of the latching dogs, the jerking of the fishing neck upwardly will shear the shear pins land retract the latching dogs.

7. For use in a tubing arranged in -a well, said tubing having a plurality of vertically spaced internal recesses formed therein: a tubular extension member; an elongated sleeve member mounted about the tubular extension member and slidable axially with respect to the tubular extension member; a downwardly facing cup packer integrally bound to said sleeve member; latches connected to the upper portion of the sleeve member; guide means mounted on the tubular extension member for guiding said latches into engagement with a said recess upon reverse circulation; `locking dogs mounted in the tubular extension member; a movable shing neck having jarring of the fishing neck whereby when the shing neck is jarred downwardly, the locking dogs will expand into said recess.

8. For use in a tubing arranged in a well, said tubing having a plurality of vertically'spaced collars forming collar internal recesses; a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular eX- tension member and slidable axially with respect to the tubular extension member land including, as a portion thereof, leaf springs each `having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular shoulder during reverse circulation; latches pivotally connected to the upper portion of the sleeve member; guide means for causing said latches lto engage a said internal collar recess upon reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member labove the leaf springs and below at least one port formed in the sleeve member whereby fluid flowed through the port on direct circulation equalizes the pressure across the leaf springs to release the latches land disengage the leaf spring locking shoulders from the tubular extension member circular shoulder whereby when the tubular extension member is lowered into the well, reverse circulation will latch the latches in said collar recess and the leaf spring locking shoulders against the tubular extension shoulder, and after completion of a wash cycle, terminating the reverse circulation and initiating a direct vcirculation will unlatch the latches and the leaf spring locking shoulders; collar locking dogs mounted in the tubular extension member; a movable fishing neck having actuating means to actuate the colla-r locking dogs into locking engagement with the said internal coll-ar recess upon downward jarring of the fishing neck whereby when the fishing neck is jarred downwardly, the collar locking dogs will expand into said internal collar recess.

9. For use in tubing arranged in a well, said tubing having a plurality of vertically spaced collars forming collar internal recesses; a tubular extension member having a circular shoulder formed on its outer periphery; an elongated sleeve member mounted about the tubular eX,- tension member and slidable axially with respect to the tubular extension member and including, 2.8 a portion thereof, leaf lsprings `each having at least one locking shoulder to prevent upward movement of the tubular extension member by engaging said circular .shoulder during reverse circulation; a pair of diametrically spaced latching dogs pivot-ally connected to the upper portion of the sleeve member yto latch yinto a said internal recess during reverse circulation; a downwardly facing cup packer integrally bound to said sleeve member above the leaf springs and below at Ileast one port formed in the sleevev member whereby fluid iiowed through the port on direct circulation equalizes the pressure across the leaf springs to release the latching dogs and disengage the leaf spring locking shoulders from the tubular extension member circular shoulder; a mandrel integrally connected to the upper portion of the tubular extension member, said mandrel having two diametrical openings; collar locking dogs, One

for each opening in said (mandrel, adapted for movement within said openings; a latching dog cone support connected to the mandrel; a pair of concave cone segments integrally connected to the cone support; the tapered portion of each concave cone segment serving to guide a latching dog during movement of the latching dog into.

said internal recess whereby when the tubular extension is lowered into the well, reverse circulation will latch the latching dogs into said collar recess by cam action against the tapered means and the leaf spring locking shoulders against the tubular extension member shoulder; a fishing neck slidably extending intoithe mandrel; and a pair of collar locking dog actuating concave cone segments, one

1 1 for actuating each collar locking dog, integrally connecd to `the shing neck whereby, when the shng neck is jarred downwardly, the collar locking dogs will expand into said collar internal recess.

References Cited in the file of this patent UNITED STATES PATENTS Fox Sept. 6, 1932 Page Sept. 18, 1951 Page Sept. 25, 1956 Tausch July 23, 1957 Fredd Oct. 14, 1958