US1526741A - Releasing hook overshot - Google Patents

Description

' Feb.17. 1925,

J. F. CAILLOUX ET AL' RELEASING HOOK OVERSHOT Filed July 10. 1924 1 1 6. Bezyrzner al). l7. llyrvuclg,

Patented Feb. 17, 1925.

, I 1,526,741 PATENT OFFICE- JOHN F. CAILLOUX, EDWARD G. REIGHNER, AND HOBART M. MYRACLE, OF TONKAWA, OKLAHOMA, ASSIGNORS TO AmICAN IRON MACHINE WORKS, INC., TONKAWA, OKLAHOMA, CORPORATION OF OKLAHOMA. v

nntmsme HOOK ovmsnor.

Application filed July 10, 1924. Serial No. 725,226.

I To all whom it may concern:

Be it known that we, J OHN F. CAILLOUX, EDWARD G. REIGHNER, and HOBART M. MYR- ACLE, citizens of the United States, residing at Tonkawa, in the county of Kay and State of Oklahoma, have invented certain new and useful Improvements in Releasing Hook Overshots, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to rotary fishing tools particularly designed to lift drill pipe that has parted within the well and stuck or has fallen to one side of the hole where it is diflicult to provide an instrument which will slip over the drill pipe or slip inside of the same, and the invention particularly relates to those tools which are provided with means for causinglthe drill pipe to center itself with relation to the fishing tool, the fishing tool being provided with means whereby, as it is drawn upward, the drill pipe or other article to be drawn out will be automatically clamped.

One of the objects of the present invention is to provide an overshot with very simple means whereby a broken pipe that has fallen over against the wall of the hole may be drawn over to the center, making it possible to lower the body of the overshot over the broken pipe.

' A further object is to provide within the body of the overshot two rigid keys and dis; pose semi-circular slips on each side of said keys, and in this connection to provide theseslips with bat winged left-handed threads on the inside so'as to take a firm grip on the broken section of pipe and yet permit the release of the fishing tool from the drill pipe by turning the tool to the right and thus unscrewing the tool from the drill pipe being fished for;

A still further'object is to provide resilient means keeping the slips'forced down so as to bring them into action with the pipe being fished for and preferably to use a rubber ring for resiliently forcing the slip tating circulation through the- -downward, the rubber ring serving as ,a

packer to keep the return circulation on the outside of the pipe being fished for, and

after hold has been taken of the dpipe, faciliri l pipe.

Other objects, will appear in the course of the following description.

Our invention is illustrated in the accom- Referring to the drawing, 10 designates the cylindr1cal body portion of the overshot which is downwardly extended at its lower end eccentrically to the body, as at 11. This lower portion terminates in a laterally curved hook 12. The lower edge '13 of this portion 11 and the hook 12 which extends therefromis angularly disposed with referencp to the longitudinal axis of the fishing too v The middle of the body 10 is formed with opposed downwardly tapering seats 14 separated from each other by the downwardly inclined keys 15. These keys 15 are inserted within the tapered portion of the body and rigidly fastened opposite each other. Immediately above this tapered portion 14, the wall is cylindrical so as to receive within it the rubber ring 16, and above this portion within which the rubber ring seats the interior. of the body is interiorly screwthreaded, as at 17 Disposed against-the seats 14 and on each side of the keys 15 are the two semi-circular interiorly screw-threaded, as at 22, for engagement with the lower end of the drill pipe. i a

With the construction as heretofore described, the tool is run into the hole until the igure 3 is a fragmentary longitudinal top of the pipe being fished for is found. The fishing tool is then turned to the right until the hook 12 has engaged the upper end of the broken drill pipe and shifted it to the centerof the hole. The tool is then lowered so that the upper end of the pipe being fished for will enter the bowl or body 10. The sli 's 18 will raise up in the bowl against the action of the'rubber ring 16 when the slips come in contact with the broken pipe, allowing the pipe to pass on upwar through the bOWl or body. When the fishing tool has telescoped upon the pipe being fished for to a sufficient extent, the. tool is pulled upward and the slips, under these circumstances, will more downward, grasping the broken pipe. The pipe is then drawn out of the hole and release can then be effected by turning the tool to the right. p

As the slips have bat winged left-handed screw-threads and as these slips must rotate with the body of the tool, it is ObVlOllS that .the slips will unscrew from the drill pipe when the tool is turned to the right.

Preferably the ring 16 is of rubber, as by making this ring 16 of rubber the ring serves as a packer to keep the return flow of fluid on the outside of pipe and after hold has been taken on the broken pipe it facilitates circulation through the pipe. Thus it will be seen that this ring serves a two-fold purpose, namely that of packing off the circulation and forcing same to the bottom of bit or pipe being fished for. and that of acting as a spring to keep the slips in their proper place when running tool into the hole and also when taking hold of the broken pipe. The hook at the lower end of the fishing tool not only serves to straighten up broken pipe in the hole or pipe that has fallen over against the side wall of the hole,

but it also serves as a guide to cause the bowl of the overshot to go over the pipe, thereby facilitating taking holdof the broken pipe.

We claim 1. A fishin tool comprising a tubular body, a plura ity of slips arranged within the body and adapted to grip an object to be recovered, and a packing ring of elastic material disposed within the body immediately above the slips and engaged by the upr ends of said slips and yieldingly resistmg upward movement thereof, said packing ring acting to keep thecirculation on the ini aaaai side of the pipe to which the fishing device is attached and the pipe being fished for.

2. A fishing tool comprising a tubular body, the lower end of the body having an eccentric, downward, tubular extension, the lower extremity of the extension being formed 7 with a laterall extending hookshaped portion, the interior of the body midway of its length being formed with a downwardly and centrally inclined seat and d the upper end of the body being interiorly screw-threaded, a plurality of rigid keys attached to the inside of the body and extending downward over said inclined portion, a plurality of segmental slips disposed between said keys and recessed to fit the k i s and held from rotational movement by t 1e keys, and a rubber ring resting upon the uper ends of the keys and upon the upper edges of the slips and extending u ward to said screw-threaded portion, the ru ber r1n yieldingly urging the slips downward an acting as a packing ring.

-3. A fishing tool comprising a tubular body, the lower end of the body having an eccentric, downward, tubular extension, the lower extremity of the extension being formed with a laterally extending hookshaped portion, the interior of the body midway of its length being formed with a downwardly and centrally lnclined seat and the upper end of the body being interiorly screw-threaded, a plurality of rigid keys attached to the inside of the body and extending downward over said inclined portion, a plurality of segmental slips disposed between said keys and recessed to fit the keys and held from rotational movement by the keys, a rubber ring resting upon the upper ends of the keys and u on the up er edges of the slips and exten ing upwar to said screw-threaded portion, the rubber .rin yieldingly urging the slips downward an. acting as a acking ring, and a coupling member having its lower end exteriorly screw-threaded for insertion within the uptit per screw-threaded-end of the tubular body 7 our signatures.

JOHN F. CAILLOUX. ED. G. REIGHNER. HOBART M. MYRACLE.

Images