US1780134A - Fishing socket - Google Patents

Description

G. 1- LE Bus FISHING SQCKET Oct. 28, 1930.

Filed July 30, 1928 INVENTOR 5607' M506 ATTORNEY WITNESSES 6 H lcu flh. W

of Figure 1,

59 pipe sniigbearse it Patented Oct. 28, 1930 OFFICE GEORGE" E. LE BUS, F ELECTRA, TEXAS FISHING SOCKET Application-filed July 30,

,7 This invention relates to improvements in fishing tools, sometimes known asovershots, and it consists of the constructions, combinations and arrangements herein described and claimed. 7 I 7 "Que of the objects of the invention is to improve the overshot disclosed in United States Patent No. 1,493,350 granted to George F. Le Bus on May 6, 1924, by in corporating a packer in themechanism so that a circulation may beestablished through the pipe being fished after in case the pipe should be stuck in cavings or'a tight hole.

Another object of the invention is to combine keys with the packer attachment and certain slips so that the pressure of a spring, associated with the packer attachment, may be exertedsagainst the slips and keepthe-latter in the proper gripping position. I

2T0 l i 'further object of theinvention resides in the formation of the teeth'or wicker's of the slips, these being made relatively fine and inclinedat adecided pitch so that more positiveand faster operation may be had in releasing the tool. I v I p p A still further object of the invention is tou'sei. squarefthread's between the relatively thinwalls of the socket and the 'upp'erf and lower sections to which it isattached.

Other objects and advantages appear in the following specification, reference being-had to the accompanying drawing ini wh-ich Figure 1 is a vertical section of the improved fishing tool, showing theparts in posit-ion to grip a pipe'string or other object loose in the well, c i,

Figure 2 is a similar view showing the parts in the grippingposition, I

1 Figure 3 is across section taken on the line Fishing. tools, as used in: connection with well drilling, have become so tern ied' by virtue of their use in retrieving implements that have been dropped in the well. I Fishing tools are. used forsgrabbing sucker; rods, drilling tool's'ofvario'i'is kinds, sections of piping and the like, and while the tool disclosed'here'in can be used for anyofltheforegoing purposes it 'isespecially adapted torflretrieving a lost provisions for mak 1928. Serial No. 296,188.

ing' a seal around the lost pipe string and permits the establishment of a circulation of fluid through the pipe string.

I This is of especial advantage in cases'where the lost pipe string has become stuck in the well either by virtue of a tight hole or by cavingsthat have accumulated around the pipe string and have wedged it in tightly. In either of such instances the fishing tool would be let down until the packer attachnient encounters the nearest couplingwith which itmakes a seal; the invention will be explained as the description progresses, p 4 1 Reference is made to the drawing. Those parts which agree with the foregoing Patent No. 1,493,350 are briefly described as follows: A socket, generally designated 5,.comprises a head 6 which is screwed at 8 into a body later described. The head is provided with an annular shoulder 10 against which the edge of the b'odybinds when the parts are screwed together tightly.

y The guide 7 has a semi-circular lip l6-the forward edgeof which is inclinedinwardly as at 1'7, the purpose of the structure being to facilitate the introduction of the object to be gripped into the socket where it will be held by the slips. An annular extension 21 of the head 6 defines achamber by which a coiled spring 20 is contained anda guard for preventing injury to that spring.

The improvements comprlse the following: A body 9 is interposed between the head 6 and guide 7, the latter being internally threaded at 11 to receive a correspondingly threaded reduced end. of the body. The threads 8 and 11 are known as square or Acme threads. These have been found to be particularly well suited in a construction of this kind where a thin-walled body is to be. screwed upon another part.- For instance, the use ofsquare threads between the head 6 and body 9 provides maximum strength. The wall of the body 9 must necessarily be The other features of made as thin as possible both to adequately 1 accommodate 'the mechanism on the inside and yet be small enough to freely slide in thewell casin j. H r

' Oue'eiicl ofthe spring 20 bears upon the shoulder 12 of a packer attachment which comprises a relatively large sleeve 13, loosely fitting the body 9, and a smaller sleeve 14 fitting in the annular extension 21. The sleeve 14 is offset from the sleeve 13, thus producing the shoulder 12. The shoulder 12 can engage the edge of the extension 21 when the tool is superimposed upon a loose object in the well, thus limiting the compression of the spring 20.

A groove 15 in the sleeve 13 immediately below the shoulder 12 receives a rubber or other suitable packer washer 18 which is intended to bear against the coupling C of a pipe string P to be retrieved. It will be'by the combined influences of the spring 20 and the weight of the socket- 5 that the washer 18 will compose a tight joint around the couling C. This will enable a draft, or as it has 11 stated before a circulation, through the pipe string should the latter perchance be stuck in the well.

The acking function is divided between the was er 18 and a rubber or other packing collar 19. The washer 18 is designed to bear upon a coupling C while the collar 19 makes a joint around a section of pipin The washer 18 would serve the packing unction in case there were no section of piping around which the collar 19 might fit, or the collar 19 would serve to make a joint in case there were no coupling C with which the washer 18 might engage. Both instances are provided for, the idea ofthe two dissimilarly diametered packers being to admit the fishing tool to a tubular device through which a circulation is to be established and which has a stepped outside diameter.

A groove 22 near the top of the sleeve 14, and a reduction of that part of the sleeve above the groove at 23 provides a receptacle for an end of the packer 19. The internal diameter 24 of the packer is less than the outside of the pipe P, contraction of the rubber around the pipe when the latter is forced into the collar 19, tightening the collar upon the pipe. The collar is grooved to agree with the places 22 and 23, and the upper exposed edge has a V-g'roove 25 against the sides of which fluid pressure from above may be exerted to expand the rubber and complete the o1nt.

Both rubber inserts or packers 18 and 19 are readily slipped into position in the respective groove formations, and are as read ily removed upon occasion. The surrounding parts of the packer sleeve 13, 14 protect the packer rubbers, and the mounting of these prevent them from being readily torn out in the use of the tool.

One or more keys 26 tend to keep the slips 27in line withthe packer attachment. The

slips are loose in the socket 5,and were it not for the keys 26 the slips would either drop out when the tool is not in use, or probposition, but will also ably fall over out of position when the tool is in use. The keys fit between the slips as shown in Figures 1 and 3 and extend into slots 28 cut in from the lower edge of the sleeve 13 of the packer attachment. Portions of the slips are bevelled to ride upon the bevelled annulus 29 of the body 9.

\Vhen in a condition of non-use, the parts of the tool assume the position in Figure 1. The expanded spring 20 presses the packer sleeveagainst the slips 27 which thus tend to ride down the annulus 29 but the extent to which they can ride is limited by the presence of the keys 26 therebetween so that the binding action which presently results will not only keep the slips upright in a receptive prevent them from dropping out of the tool. i

The presentation of the tool to an object to be retrieved will cause the slips to move up away from the annulus 29, and in a case such as pictured in Figure 2 the packer attachment will be moved quite out of engagement with the slips. But the latter will be prevented from tumbling over, partly because there is not much room within the socket 5 to do so, but mainly because the edges of the slips havenot departed far enough from the keys 26 and the latter are still 1n position to prevent it. The keys cannot drop out because they will rest upon the annulus 29 and be confined by the coupling C or such other object as may have been caught.

Fine, left hand threads or wickers 30 secure a hold upon the coupling C. In practice there will be four threads to the inch and they will have a pitch of one inch to the revolution. This arrangement is designed not only to secure the maximum grippin effort, but to provide for a quick release w en the tool is turned in the proper direction. With a pitch such as this it would not be possible for the. slips to lean over sufiiciently far out of position to prevent a turn of the tool from releasing it from the retrieved object.

While the construction and arrangement of the improved fishing tool is that of a generally preferred form, obviously modifications and changes may be made without departing from the spirit of the invention, or the scope of the claims.

I claim 1. A fishing tool comprising gripping means, a packer attachment, and a spring which presses the attachment against the slips to hold them in place during non-use of the tool, and which assists in holding the attachment against an object to be retrieved after the slips have gripped said object and the packer attachment has beenmoved from the slips by the introduction of said object into the tool.

2. A fishing tool comprising slips, 9. body in which they are confined, a packer attachment comprising a sleeve and a rubber, and

a spring pressing the sleeve against the slips so that they are held upon a part of the body during the non-use of the tool, but which assists in holding the rubber against an object when the latter enters the tool and moves the sleeve away from the slips.

3. A fishing tool comprising a body having a bevelled annulus,slips, keys loose between the slips, a packer attachment comprising a rubber and a sleeve which carries the rubber and which is slotted for the various keys, and a spring bearing against a part of the body and upon the attachment to press the sleeve against the slips, causing them to ride into the. annulus and bind against the, keys dur-- ing the non-use of the tool.

4.1 A fishing tool comprising slips, a body containing them, a movable sleeve which has slots, and ke s loose in the slots and between the slips ten ing to maintain a predetermined I relationship of the slips with the sleeve.

5. In a fishing tool having a head with an annular extension, a body attached to the head and having a bevelled annulus, slips bearing on the annulus, and a springaround said extension; a slotted packer attachment riding upon the extension and being pressed by the spring against the slips, and keys loose between the slips and the slots in said attachment, riding upon the annulus at timesA fi h 6. shin tool avin ri in means packer mean% to make; %luid tig ht joint around the object to be gripped, and means having loose connection with the packer means and the gripping means keeping the latter in a predetermined relationship with the former.

7 A fishingtool comprising slips, a body containing them and having a bevelled annulus, a movable sleeve adapted to bear upon the slips and having a slot, and a key loosely occupying the slot being situated between the slips and riding upon the annulus.

8. A fishing tool comprising gripping means, and a packer attachment coacting therewith comprising a rubberv to'make a fluid-tight joint around the object to be gripped, said rubber having a grooved portion, and a sleeve being correspondingly grooved to receive the grooved portion and retaining the rubber in position.

9. A fishing tool comprising gripping means, and a packer attachment coacting therewith comprising a sleeve, and a rubber carried by the sleeve having a groove with the sides exposed to fluid pressure to expand the rubber against the object to be gripped.

10. A fishing tool comprising gripping means, and a packer attachment comprising connected cylindrical sleeves of which one coacts with said grippingmeans, and rubbers respectively carried at the point of con nection of the sleeves and by the other sleeve- 12. A fishing tool comprising gripping means, a body in which said means work and having an extension, a spring for pressing the gripping means in one direction, and means by which the tension of the spring is transmitted to the gripping means belng guided by the extension and having a shoulder to engage the extension and limit the compression of the spring.

GEORGE F. LE BUS.

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