US2249358A - Fishing tool - Google Patents

Description

July 15, 1941. c. J. HAYNES FISHINQTOOL Filed Dec. 30, 1939 v INv I BY I member 8;

Patented July 1 5, 1941 FISHING TOOL 1 I Cecil J. Haynes, Houston, Tex., assignor to Standard Oil Development Company, a corporation of Delaware Application December 30, 1939, Serial No. 311,801

10 Claims.

The present invention relates to a device for recovering both the cable andthe tool when a cable suspended tool becomes lodged in a bore hole.

An object of the present invention is to produce a device which may be positively lorced down a bore hole after a stuck cable suspended tool and which will release all of the cable which is free in the well.

Another object ,of the present invention is to provide a device which maybe forced down a bore hole, and while being forced downwardly will direct a stream of liquid on a cable which may be lodged in the hole.

A further object of the present invention is to combine an overshot having milling jaws with a cable knife in such a manner that tension may be applied by the cable to a cable suspended tool stuck in a bore hole to center the tool within the milling jaws beforethe cable is severed by the cable knife.

Other objects'and advantages of the present Q invention may be seen by reading the following description and by reference to the accompanying drawing in which Fig. 1 is a cross-sectional view of one modification of the device showing a cable carrying a tool threaded ina slot with which the device is provided; I

Fig. 2 is a front elevation depicting either the modification shown by Fig. 1 or that shown by Fig. 3, since the front elevations of both modifications are identical;

Fig. 31s a cross-sectional view of a different modification of the device; and

Fig. 4 is a side view of the key used to retain a cable in position in the device.

Referring to" the drawing in detail and first to Fig. 1, the body I of the tool has its'upper and provided with a screw threaded pin connection 2 of suitable size to engage the threaded box end of a drill stem 3. The lower portion of the tool body is in the form of a tapering bell 4, the interior of which is provided with milling jaws 5 attached to the tool body by screws 6. Extending laterally from the upper portion of the bell-shaped interior to a point adjacent threaded pin 2 is a slot or groove 1. Adjacent theupper .end of groove 1 is a knife member 8' pivoted to the tool body by means of pin 9. A leaf spring l0, attached to the tool body by any suitable means, such as screw-l l, causes a downward force to be exerted on the knife edge of In Fig. 1 a'cable "having a tool l3 attached to its lower end is shown positioned in slot'l.

Means for retainingthe cable in position is shown in Figs. 2 and 4 in that .a key il is fitted into slot 1 and thenretained in position by screws II. In the modification shown by Fig. 1 the tool body is provided with a central passage l6 which will allow fluid to flow directly from drill stem 3 into the upper end of the interior bellshaped opening. 1 x

The modification depicted by Fig. 3 differs from that shown in Fig. 1 only in being provided with side fluid passages I! which connect to an upper central passage it. Such a modification of fiuid passages may sometimes produce a more rigorous washing action on' a lodged cable and tool than the modification shown in Fig. 1. It will be understood that the cross-section shown in Fig. 3 is taken along a different angle than that of Fig. I in order to more clearly show the branched fiuid passages and that the tool is provided with a laterally extendingcable groove 1 i and a knife 8 as is the modification shown in Fig. 1.

As above explained, both modifications of the invention have the front elevation shown by Fig. 2 which is provided with a key l4 fitting into slot 1. Fig. 4 is a side viewof key 1'4.

The device is used in the following manner: When an electrode or similar cable-suspended tool, for example, a bore hole gun or a coring device, becomes stuck in a borehole, the cable is threaded through groove 1 of the device while the knife edge of member 8 is held in an upward position to allow the cable to extend vertically upward after it leaves the tool. Key I 4 is then placed in position in slot l1 and secured in this position by screws l5. Sections of drill stem are thenprogressively attached to the device to enable the device to'be lowered into the well. In

the. customary manner, but is made up by holding the drill stem stationary with the elevators,

and threading the last section to the stationary sections by the aid of the cat line. The drill stemis. made up in this manner in orderv to keep the drill stem in a vertical direction and to keep it from rotating so that the cable will not be twisted.'

As the device is lowered into the well, the fluid in the well will flow into the bell shaped mouth of the overshot and" thenupwardly through the cable containing slot. This fiow of fluid through the device will exert a pressure forcing the knife away from the cable surface .as long as the device is moving downwardly.

The weight r the drill stern will ordinarily be suflicient to force the device ,to a position adjacent the stuck cable suspended tool. However, on some occasions, it may be necessary or desirable to force a stream of fluid down into the bore hole to aid in placing the device. If

such .is desired, the upper -may be connected to a pump through .a flexible end of the drill stem hose'in the known manner and fluid forced down through the central passage of the' drill stem but to claim my invention and then through the device to wash material from around the cable.

Ifthe lowering of the device has been successful, a position will be attained with the electrode. or other stuck tool, within the mouth of in the electrode in the conventional manner of After a thread has fishing with a milling tool. been milled on the electrode, the device having the electrode attached to it by said threads may be withdrawn from the bore hole..

' It will be understood that on some occasions the hole will be so completely bridged that it will be impossible to force the overshot down to the stuck object in order to mill a thread on the object. If the hole is in this condition, the cable may be severed after. the device has been forced downward as far as possible and the cable salvaged leaving the. lodged tool in the bore hole. However, it will be understood that the weight of the drill stem and the force of the fluid impinging in the bore hole will on most occasions enable both the cable and the stuck tool from the bore hole.

Various modifications of the device may be made without departing from the scope of the to be recovered portion or said bell-shaped -portion, milling jaws attached to the interior of said bell-shaped. portion, a guideway extending laterally through the body from the upper part of the bell-shaped space to the upper surface ofsaid body adapted to receive a cable, a member attached to'said body arranged to form'theputer wall of said guldeway and to be removed for the insertion of a cable in said guideway, a' knife mounted on said body adjacent said passage, elastic-meansforcing the edge of said knife against a cable threaded in the guideway. the knife and elastic means being arranged sothat an upward pull on said string of pipe will cause said knife to cut the cable.

5. A fishing tool comprising a bodyprovided' adjacent the line entering the lower end of said invention. For example, the slot for the cable obvious that various changes in theshapes and sizes of the parts of the device may also be-made.

It is therefore not my intention to belimited to the specific modifications of the invention shown,

art permits. c

I claim:

1. A fishing tool for an object suspended on a as broadly as the prior.

cable comprising a body provided with milling jaws adapted to cut a threadon the upper end of said object a passage in said body to receive the cable, and a knife carried by said body for outting said cable preliminarily to the threading operation. a

2. A fishing tool comprising a body provided with a bell-shaped lower portion, milling jaws attached to the interior of said bell-shaped portion, a passage extending laterally through the body from the upper part of the bell-shaped space to the upper surface of said body, and a i knife pivoted to the upper surface of said body said body from its upper surface to the upper part of said bell-shaped space.

4. A fishing tool comprising a body provided with a bell-shaped lower portion, screw threads on the upper portion of said body for attaching said body to the lower end of a string of pipe, a

' plurality of passages in said body arranged to convey fluid from said string of pipe to a lower guideway. r

6. A device in accordance with claim 5 in which the lower portion of said body is provided with a relatively large upwardly extending cavity in communication with said guideway and said passage.

7." A fishing tool comprising a body provided with means for attaching it to the lower end of an elongated rigid member, an upwardly extending cavity in the lower portion of said body provided with means for milling threads, a guideway for a line in said body in communication with saidcavity, and a knife arranged on said lTidy adjacent said guideway for severing said 8. A fishing tool comprising a body provided with means for attaching it to the lower end of an elongated rigid member, an upwardly extending cavity in the lower portion of said body having arranged within it means for attaching said body to an object within a bore hole, a guideway for a line in said body in communication with said cavity, and means attached to said body arranged for severing said line.

9. A fishing tool comprising a body provided with means for attaching it to the lower end of a string of pipe, an upwardly extending cavity in the lower portion of said body having arranged within it means for attaching said body to an object within a bore hole, a guideway for a line in said body in communication with said cavity,

means arranged on said body for severing'said line, ,and a passage in said body arranged to convey astream of fiuid from said string of pipe to a point adjacent the line entering said-guideway 10. A fishing tool comprising a body provided with .means for attaching it to the-lower end of a string of pipe,-an upwardly extending cavity in the lower portion'of said a guideway fora line in said body in communication with said cavity, a knife arranged on said body adjacent said guideway for severing said line, and a plurality of passages in said body arranged to convey fluid from said string of pipe to said cavity in a plurality of inwardly and downwardly directed streams. l

CECIL J. HAYNES.

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