US1357508A - Oil-well fishing-tool - Google Patents

Description

M. M. MCGREGOR.

OIL WELL FISHING TOOL.

APPLICATION FILED MAR- 5` I9I9.

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MARY M. MCGREGOR, OF PASADlilN'A,A CALIFORNIA.

OIL-WELL FISHING-TOOL.

To @ZZ whom it may concern:

Be it known that I, MARY M. MOGREGOP., a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Oil-loll Fishing- Tools, of which the following is a specification.

rlhis invention relates to lishing tools for well drilling apparatus, and consists in the new and useful features and in the novel construction, arrangement and combination of parts, the advantages of which will be apparent from a consideration ot the preferred form ot construction herein shown, described and claimed.

The principal object of the invention is to provide a simple and positive means for easily and quickly removing under-reamer lugs, bolts or other small objects which may have accidentally fallen into or been displaced in, the bottom of the well.

ln the operation of sinking oil wells hard stratas ot roclr are likely to be encountered and under-reamers are used to enlarge the hole. Said under-reamers have lugs that are apt to become loosened from the underreaming tool and to tall into the hole. This is only likely to occur in Jformations where the bottom of the hole is hard and the lug can not be driven out ot the way but must be removed. Various appliances have been provided for the purpose of removing such lugs but this invention is broadly new, basic and primary in its character in that l provide the tool with lingers which are adapted to pass down and around the sides of the objects to be removed and to be bent underneath said objectby the application of such pressure or force as can `be applied by the usual jars of a well drilling rig. To this end the lingers are constructed of material such as steel havinga stubborn upper portion and being reduced toward the points oli the fingers and being at the lower ends or points of such construction and temper that they may be given by the jars, a permanent set or crimp underneath the object to be removed. Y These lingers are slightly resilient under such pressure as may be exerted by hand or by means not capable of applying great force, but thetemper of the lower ends ofthe ngers is such as to allow such ylower ends to be given a permanent set when driven down against the hard rocky bottom of the hole by means of the powerful appli Specification of Letters Patent. i

Patented Nov. 2, 1920. 191e. serial No. 280,872.

cation of force which can be exerted by the usual jars of a well drilling rig.

Other objects, advantages and features of invention will appear from the drawing, the subjoined detail description and the appended claims.

The drawing illustrates the invention.

Figure l is a broken sectional view of the bottom portion ot a well in which an under reamer lug has been lodged; and showing the well casing in section and the tishing tool in vertical section and in itsiirst position of enveloping the lug to be removed from the well. y

F ig. 2 is 'a section taken l, showing the means used for attaching the fishing tool to the shank ot a drill bit.

1 Fig. 3 is a broken sectional view of the bottom portion of a well similar to that shown in F ig. l, and showing moved to a final enveloping position under the lug which is to be removed from the well.

Fig. a is a section on line at of Fig. l with parts omitted.

Fig. 5 is a section on line x5 of Fig. 4.

Fig. 6 is a detail of the lower end oli' one oi the lingers of the fishing tool showing a preferred shape of said ends.

In detail, the well l is shown drilled into hard substance 2, such as rock or the like, through which deep wells have to pass. In the upper part ot the well is shownthe casing 3 having on its lower end the drive shoe 4C Athe purpose ot which is to facilitate the lowering of the wellcasing, when the well has been enlarged by reamers, not shown, but which are well understood as tofunction and operation, the casing following the drills and reamers downward `as they form the well, resulting in a very heavy column of pipe from near the bottom of the well to its top, which piping would require considerable time and labor for removal in` order on line r2 of Fig.

to remove an obstruction.

These obstructions usually consist of under-reamer lugs, .broken drill bits. bolts or other hard objects which are small enough to allow them to be drawn up through the well casing if properly grappled; and this invention lconsists in providing means for so removing such obstructions without Vremoving the casing.

As shown in Fig. l, there is attached to the jar rod 5 one end of thebit Gwhose lower end is threaded to fit into the threaded socket 7 of the iishing tool 8.

the lishing tool whenf'they have passed below To the lower' edge of the head 9 of the fishing tool 8 and integral therewith, are `the lingers lOowhich are distributed at equal distances around said head. l preterto'use six ol these lingers but do not limit the invention to that number as any other number of nngers may be used. These lingers extend downward a considerable distance lrom` the head and are tapered to a sharp point at their lower ends winch are spread outward beyond the interior circumference of 'the well casing; so'that in inserting the fishing tool the lingers will have to be sprung inwardly. The lingers are adapted at the lower ends to be Vgiven a permanent set at the bend but are constructed with enough resilience to spring them outward again the bottom olf the casing, giving them a slightly wider grappling radius. rlGhe length and taper of the lingers admit oli this slight resilience, y Abut their temper isnot sullicient to prevent the points 'from being bent, and given a permanent set sov that they will remain in a'bent position whenl driven down with sufficient torce togive them a permanent set or crimp. And it is this feature whichconstitutes the elfectiveness oi my invention. Fingers of any other shapeI Aor conformation may be used without Vdeparting from the spirit of my invention, provided hey are so tempered as to enable the operator to produce thel same effect. v l

As shown,y thel drill hasy the cut away sides- 11 common in drill bit construction, to allow. the passageway 12 between thedrill and the base of the fishing tool for mud and water lilto pass. This mud and water line isf` shown as being'slightly above the fishing tool,.for the saire old clearness, but it is usu- Y ally much higher. Y

Vln operation, assuming thattherlu'g lll has accidentally fallen tothe bottomi ot the well 1 and is to be removed bel'ore. drilling canrbe resumed, thelishing tool S is attached to the bit 6 andthe latter secured tothe jar rod 5; Thelingers 10 are then compressed until they will` enter the well casing 3; The lishingv toolA is then forced downward until the fingers 10 expand below-'the bottom of the'rasing and envelop the lugll, as shown inlligl.

By operating the' jarsl the lower' ends' of thelingers-willbe bent or crimped so as to extend from numerous sides underneath the objectv toxbe lremoved and will: be given a permanent bend, set or crimp lso that when the lishin'gtool 8 is drawn out, the permaf nently bent endsl of' the; linger tips will carry out the objectv to .be removed.`

It will be seen Jfrom the foregoing thatan obstruction mayy be removed ironia well ver-y easilyv and quickly andin avery yshort time; y v Y When the fishing tool has beent removed 'from the well the lingers may be heated and 'straightenedout so as` to release the object,

thus removed. Thereupon the lingers may be again bent into the form adapted to the purpose above described. V

By the old method of pound-ing the lug into fragments it'required many days Voli time and labor to clear the well oi" the obstructions; and oftentimes such laborious eli'orts were unsuccessful Aowing to fragments of the lug being pounded intothe rock and being dislodged above the drill, locking the drilling mechanism and causing the weil to-'be abandoned.

My invention eliminates all this arduous labor of clearing the well of obstructions; and accomplishes this object with maximum ease and speed and minimumv labor Vand expenditure olf time, and is broadly new and basic in principle.

The invention admits oi modilications, and a right is claimed' to all such as do not depart Yfrom the scope and spirit oi' my invention.

.l claim:

l". ln a llishing toolf ler wells, a head; and aplurality of lingers secured to said head and adapted to be permanentlyk bent around and made to` grapple an obstruction in the well.

2. .ln a lishing tooly lor wells, a head a plurality et lingers adapted to bend under pressure, secured to said head and adapted to envelop an obstruction in saidwell; and means toi-'permanently bending said lingers around said obstruction.

3, ln a ishing'tool' for wells, a head; a pluralityY of lingers integral with said head, said lingers lbeing adapted to envelop an obstruction in said well; and means l'or forcing and holding said fingers around said obstruction.,

4.-., ln a: lihing tool tor wells, a head; a plurality ol lingers extending dnwnward iromsaid head and adapted to\ envelop an obstruction in sa'd well;.meansffor forcing the lingersA down the well and for bending` aid lingers Vabout said obstruction for the purpose of removing said obstruction from the well. l

5.. ln a fishingtoolV for wells, a head; a plurality of lingers extending downward from Vsaid head andfadapted to' envelop an obstruction in ay well', `said 'lingers being adapted to be bent under pressureI within 'a well.; means lorilowering said/*lingers into the well to envelop an obstruction; and means for'bending said: lingers around: said obstruction. i v f y 6; In a lishingtoolf for wells, ya head; a plurality of.` lingers' equidistantaround the bottom of' said head, said lingers extending downward and adapted to envelop an obstructionin al well, and adapted to be bent under the obstruction: by a downward pressure; means for lowering said fingers in the well; and means for bending said ngers around the obstruction for the purpose of removing it from the well.

7. In a fishing tool for wells provided with a well casing; a head; a plurality of fingers equidistant around the bottom of said head, said fingers tapering downwardly to points and adapted to envelop an obstruction, and to be bent ther'earound under pressure, the points of said lingers being normally extended beyond the interior diameter of said well casing. a

8. A fishing tool for wells, comprising a head adapted to be attached to a driving rod and movable in a well provided with a casing; said driving rod; malleable lingers rigidly attached to said head, the free ends of the fingers being inturned andnormally sprung outwardly beyond the casing; and means controlled by the operator to cause the fingers to be contracted to clutch an obstruction and hold it for removal from the well.

9. Means for removing obstructions from a well provided with a casing, comprising in combination, a j ar rod adapted to operate in the casing; a threaded head detachably fixed to said rod; bendable and resilient ngers rigidly attached to said head provided with inturned, sharpened ends adapted to be bent under an obstruction and there given a permanent set by means of downward pressure exerted by the jar rod upon said fingers pressing the same against the hard bottom, and adapted to be thereby bent around an obstruction at the bottom of the well and to preserve a clutch upon the obstruction tc enable the same to be drawn up through the casing by means of the jar rod.

lO. In a fishing tool, in combination with a head; malleable clutching membersradially centractible under downward pressure, and adapted to be given a permanent set to retain such contracted position until expanded by the operator.

ll. In a fishing tool, a body member; malleable radial clutching members so shaped that endwise pressure against them will cause them to be contracted radially and cordinately, and to receive a permanent set so as to remain in such clutching position until expanded by manual force.

12. A fishing tool having bendable lingers adapted to be permanently bent toward each other at the lower ends to clutch a loose obstruction at the bottom of a well by pressing the lower ends of said tool against the bottom of the well, for the purpose of grappling and removing an obstruction.

In testimony whereof I have hereunto set my hand at Los Angeles, California, this 27th day of February 1919.

MARY M. IVICGREGOR.

Witness:

WILLIAM M. GENTLE.

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