US589607A - Fishing-tool for oil-wells - Google Patents

Description

(No Model.)

J. A. MILLS.

FISHING TOOL EUR OIL WELLS.

No. 589,607. Patented s ep1;.f7,1897.

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f alrnrrr trice@ JOIIN ANDREWY MILLS, OF GAINESVILIIE, TEXAS. v

FISHING-TOOL FOR OILJNELLS.

SPECFLCTEON foi-:ming part ofLetters Patent DTe-589,602 dated September 7, 1897.

Application led VFebruary 23,1897. Serial No. 624,684. (No modelJ To (Lgf/ 'l1/'71,0110 t 11mg emmer/f Be it known that 1, .loi-IN ANDREW "MILLS,

a citizen 4of the United States, residing at- Gainesville, 'in the county of Cooke and State lof Texas,- have invented a new and useful Fishing-Tool for Oil-Vells, of which the following is a specification. My invention relates toflshing-'tools for use in conn ection with oil-well drilling and pumping apparatus, and the object in view is to provide asimple device for engaging a,drill or pump rod for extraction from a well when said rod has become detached from the exposed drilling or purnping'apparatus and has fallen into the well.

It is com mon for this purpose to employ a fishing-tool so constructed as to engage the rod exteriorly, but owing to the fact that a detached rod usually if not invariably lies against one side of the drill-hole much time is lost in straightening the rod orremovingit from cont-act with the side of the hole sufiiciently to allow the jaws of the tool to engage the saine. rTherefore it is my object to provide a tool adapted to engage a rod interiorly and which may be introduced with facility and then firmly locked to prevent displacement during thelifting of the detached portion of the drilling apparatus.

Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claim.

In the drawings, Figure l is a side view of a fishing-tool constructed in accordance with my invention arranged in the operative position in au oil-well in engagement with a drillrod. Fig. 2 is a detail view in perspective of the drill-tool. Fig. 3 is a central sectional View of the saine. Fig. i is a detail edge view thereof.

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

l designates the shank of the hshing-tool embodying my invention, and 2 the head thereof, which is vertically or longitudinally slotted to form an open-sided casing for the clutches 3, which are pivotally mounted therein., with their serrated extremities projecting beyond the sides of the head to engage the innersuriface of atube or drill-rod, such as that illustratedtat Li in Fig. l. The lower ext-reinity of the head is preferably reduced, as shown at 5, to facilitate insertion into the tube or rod.

The clutches, which are beveled or rounded at their serrated outer extremities, are extended beyond their ful'crum-pins (5 and are reduced, as shown at 7, for engagement by a shifting-barS, which is arranged longitudinally with relation tothe slotted head of the tool. The clutches,being enlarged or weighted at their outer extremities, are normally held in their operative or enga-ging positions by gravity, and in order to assist or insure this depression of the outer extremities et the clutches by relieving the same of the weight of the shifting-bar I attach to said shiftingbar an actuating-spring 9 or its equivalent, and hence when the tool is inserted into the bore of a tube or drill-rod the upward pressure of the extremity of the latter upon the clutches serves to displace them sufiiciently to allow the tool to enter the tube or rod. lVhen, however, an upward strain is applied to the shank oi` the tool, the serrated faces of the clutches engage the inner surface of the tube or rod and are forced irml y into contact therewith to prevent removal.

It sometimes happenstthat a drill-rod becomes caught by an obstruction within the drill-hole, whereby the withdrawal of the same is prevented, and in order to provide for the detachment of the iishing-tool therefrom under these circumstances I employ a trip-cord 10 of suiiicient strength to support the weight of the fishing-tool, which is carried through a suitable guide, such as a directionpulley ll, in the lower end of the slot in the head and attached to the lower extremity of the shifting-bar. Strain upon this trip-cord sufficient to lift the weight of the fishing-tool will depress the shifting-bar against the tension of its actuating-spring and thereby disengage the clutches from the drill tube or rod. The fishing-tool may be introduced into a drill tube or rod without allowing contact of the clutches with the inner surface thereof by lowering said iishing-tool by means of the trip-cord,

The cable l2, by which the fishing-tool is lowered and elevated under ordinary circum- IOO stances, is attached to a rin g at the upper end of the shank.

The clutches are arranged to pro ject alternatelybeyond opposite sides of the head, and they are arranged, respectively, in diiterent transverse planes to avoid the diametrically opposite pressure of two clutches, the disadvantage of such a diainetrical pressure being that it is liable to result in the transverse expansion or fracture of the drill tube or rod due to the eccentric action of the clutches, thereby damaging the drilling` or pumping apparatus and defeating the object oi the iishing-toel. By arranging the clutches to project alternately beyond opposite sides of the head in diiierent transverse planes they engage the tube or rod at dilierent distances from its extremity and thereby avoid said objectionable expansion.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the spira or sacriiicing any of the advantages of this invention.

Having described my invention, what claim is A fishing-tool having a head adapted to oe introduced into the bore of a drill tube or rod. pivotal clutches mounted upon said head and projecting beyond the sides thereof to engage the inner surface of the tube or rod, and a spring-actuated bar connected to the inner extremities of the clutches and normally holdin g the latterin their Operative positions, su `o stantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature 1n the presence of Itwo witnesses.

.IOIIN ANDREV MILLS.

Witnesses:

J. T. ADAMS, F. X. Senao.

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