US1750248A - Fishing tool for sucker rods - Google Patents

Description

March 11, 1.930.

o. J. THOMPSON 1,750,248

FISHING TOOL FOR SUCKER RODS Filed July 17, 1929 ATTORNEY Patented Mar. 11, 1930 UNITED STATES ORVILLE J". THOMPSON, OF FRANKLIN, PENNSYLVANIA FISHING TOOL FOR STICKER RODS Application filed July 17,

This invention has for its object the production of a simple, efficient and comparat-ively inexpensive tool whereby sucker rods may be recovered from the tubing of a well when the rod has become broken at a point intermediate the joints and thus becomes severed from its upper portion so that it cannot thereby be withdrawn from the tubing.

The construction of my improved fishing 1,0 tool for sucker rods is clearly shown in the accompanying drawings in which:

Fig. 1 is a side elevation of the top member of the tool.

Fig. 2 is a side elevation of the chuck body.

Fig. 3 is a side elevation of the bottom member.

Fig. 4 is a central vertical section of Fig. 3.

Fig. 5 is a side elevation of the tool with its members assembled in operative relation.

Fig. 6 is a central vertical section of Fig. 5.

Fig. 7 is a transverse section on line VII VII of Fig. 6.

Fig. 8 is a transverse section on line VIII 5. VIII of Fig. 6.

Fig. 9 is a transverse section on line IX IX of Fig. 6.

Fig. 10 is a side elevation of the jaw-member of the tool showing a fragment of a sucker rod extending through the same, as

when it is engaged by the tool to be withdrawn from the tubing.

In detail the construction set forth in said drawings is as follows:

The body of this tool consists of two members namely, the upper or socket member 1 and the lower or tubular member 2, a chuck member, Fig. 2, is carried within said body. Said upper member consists of a cylindrical socket provided at the upper end with a screw-threaded stud, 3, by means of which the tool may be attached to the internally screw-threaded socket of a sucker rod or like element whereby it is lowered into and withdrawn from the tubing in the act of engaging with and withdrawing the sucker rod.

Below said stud 3 body 1 is provided with some suitable form of corrugation for engagement by a fishing tool should stud 3 be- 50 come broken 01f or the tool become otherwise 1929. Serial No. 378,915.

severed. from its actuating-means and drop into the tubing; the lower end of said member: 1 for a comparatively short portion of its length as indicated at 5 isreduced in. diameter and said short portion is provided with an external screw thread for co-operation with the internal screw-thread 6 within. theupper end of, the lower body member 2. Said member 2 is a tubular elementhaving a modified bore extending'throughthe same ;'be-. low said screw threaded portion 6,.theboreis; formed with a downwardly-converging ta cred portion 7, below which is a straigit; portion 8, whichter-minates inv a shoulder- 9 the remaining lower portion. 10; of: said bore. 05 being somewhat largerthan the diameter" of the sucker rod tobe operatedupon.

The portions 7 and 8 of the bore of the. member are adapted to receive the automatic. chuck-Figs; 2 andf10which comprises :rod- 701 gripping; jaws 11 and a. sleeve member 12.; the periphery of saidjaws 11 is formed witlr a; downwardly converging taper. for-co-operation with the, tapered wall 7, of: the-:bore of the-body member 2; the outsidediameter of. 7. sleeve12 is somewhat smaller than; and is free to havevertical movement in theportion 8. of said member 2.

Thechuck body-Fig. 2iis provided with; a pluralityof longitudinally-extending slots. 13, whereby the. gripping head; ll of saidchuck is adapted to haveresiliencefor the purpose. of expanding and. contracting for gripping and. releasing a sucker rod, as 14:, which, is being operated upon.

The internal gripping faces 15 of the j awe of the chuck are knurled or roughened in; some suitable manner to cause themto secure-'- lygrip the rod, asl l. Inthedrawings the. roughness isshown as beingimpartedto said faces: 15 by. tapping them. with an. internal. left hand thread, said left .hand;thread being; employed sothatthe chuck may be-released from its grip upon therod by unscrewing it. through the medium of a. sucker rodwhich carriesrit, the joints of whichare: provided with right hand threads. The material in said. chuckissteel, whichis hardened after it ,isifinished and, if a considerable degree of. forceis requiredtoextract the sucker rod.

from the tubing, the threads of the will become embedded somewhat into the rod, and in such a case the tool may be readily unscrewed from the rod. The internal diameter of the hole in said jaws 11 is slightly smaller than the diameter of the rod to be operated upon so that as the rod passes through the chuck it causes said jaws to expand somewhat.

It is pointed out that the elongated tubular sleeve 12 below, and which forms a portion of the aw structure, is arranged to, conjointly with the portion 10 of the bore of member 2, constitute an elongated guide-socket which serves as an approach to the jaws 11 whereby the adjacent end of a sucker rod is not only caused to be concentric with the gripping faces of said jaws but is also prevented from bending when the fishing tool is forced into gripping relation therewith.

My improved sucker rod fishing tool is used in the following manner:

lVhen a sucker rod which is in use in a well becomes broken, the fishing tool is screwed into the socket of that portion of the rod that can be withdrawn from the well; it is then inserted and lowered into the tubing so that the end of the rod within the well enters the bore of the fishing tool and when the end of the rod comes into contact with the lower edge of the jaws 15 of the chuck, the chuck is caused to rise until its upper face contacts with the lower face 16 of the upper member, whereupon, jaws 11 are caused to expand and the rod 14 passes therethrough until its upper end contacts with the upper end of the bore 17 The tool is then raised and the first result of the upward movement of the tool is to cause the jaws 11 to seat in the tapered portion 7 of the bore of the member 2; this seating action compresses and tends to contract the jaws and causes them to firmly grip the engaged sucker rod 14; a continued upward movement of the tool carries the rod with it to accessibility for removal from the tubing in the usual way.

I claim the following:

In a fishing tool for sucker rods, a cylindrical body provided at its upper end with means for attachment to an actuating means, also a bore extending into the lower end of said body forming a socket and chuck-chamber, said chamber being formed at its upper end with upwardly-diverging walls terminating at their upper limit in a shoulder, and a longitudinally-movable, cylindrical chuck within said chamber consisting of an elongated, tubular element adapted to be limited in its upward movement by contact of its upper face with said shoulder, said chuck having at its upper end eXpansible and contractible jaws and a rod passage therebetween for contact and engagement with the periphery of a rod, said limit of the upward move ment of said chuck being for the purpose of forcing said jaws over the rod to be operated upon, the outer peripheral faces of said chuck jaws having upwardly-diverging surfaces i ORVILLE J. THOMPSON.

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