US1414531A - Tool - Google Patents

Description

c. s; STRAIGHT. TOOL. APPLICATION FILED APR. 8, I920.

' '1,414,531. Patented May 2, 1922.

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oHAaLEs s. s'rRAIGI-rr, or nausea, TEXAS.

TOOL.

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Be it known that 1, CHARLES 5:. STRAI HT, a citizen of the United States, residing at Ranger, in the county of Eastland and State of Texas, have invented certain new and useful Improvements in Tools, of which the following is a specification.

The object of the present invention is to provide an improved tool of the ;charaoter employed for lifting or recovering casings or pipes which have broken off or become lost in the well-hole of tubular wells.

A further object is to provide an implement of this character which may be lowered into the well-hole. for engagement with the casing sought to be recovered, improved means being embodied in the construction of the device whereby it may be expanded sufficiently to hold the casing during-the pulling or lifting of the same.

lVith these and other objects in view, the invention consists in the details of construction, combination and arrangement of parts as will be hereinafter more fully set out and described, reference being had to the accompanying drawings whereins Figure 1 is a vertical longitudinal .section ofthe improved steering device.

Figure 2 is a top plan view thereof, with a cross section of the mandrel shown as takenpn line 22 of Fig. 1. v

Figure 3 is a cross section taken on the line 3-3 of Fig. 1 looking in the direction indicated by the. arrows.

As more particularly pointed out in the specification following and as illustrated in the accompanying drawings, it is to beseen that; this improved spearing or lifting tool is substantially embraced in three elements; namely a cylinder, cylinder collar and a mandrel, made of steel or any other suitable material and turned to shape. In the drawings the numeral 1 designatesthe cylinder, of proper diameter and length for the object in view, and threaded externally at its upper end with threads 2; which end is to be fitted into the collar of thespear. The cylinder is split longitudinally of its lower portion, and divided into an adequate number of separate sections or pipe grips 4 depending from a point 5 near the upper end to allow for substantial expansion of the cylinder under the pressure of the mandrel as will hereinafter be more fully referred to. Each section has a tapered lower end 5' which coacts with the tapered ends of the Specification of Letters Patent.

Application filed April 8, 1920. Serial 110,372,237.

other sections to provide a pointed, or rather rounded, nose for the entire cylinder. the p1pe grips 4. are to be expanded into engagement with a pipe, for gripping and holding it, each one has corrugations cut on the outside to form sharp teeth .6 which point upwardly so that as the cylinder is raised for lifting the pipe, the teeth will be caused to .bite more firmly into the pipe and thus hold it securely while it is being raised. The cylinder is to be fitted with a'mandr el and for that purpose is provided with a smooth bore 7 of uniform diameter -.thr oughout the upper or solid end 1 of the cylinder but tapering from the point 5 towards the nose from which result the fact thatthe pipe grips 1 are of substantial thickness, and

therefore strengthened at their gripping ends, while the narrowed ends8 render them flexible and resilient. The upper edge of the bore is beveled as at 9 to enable the mandrel to be more easily and readilyinsorted in the cylinder after it has been lowered into hole of the well, the bevel edge extending as will be noted out to the threaded edge.

Fitted to the cylinder 1 is the collar 10 having its bore 11 threaded for engagement with the threads 2 of the cylinder as illustrated. This collar is adapted to couple the cylinder to a supporting casing (not shown) by which it can be lowered into and lifted out of the'well hole. This casing I would be screwed into the upper end of the collar and thus connected to the cylinder. The lower end of the collar forms a shoulder 12 which abuts against the edge of the casing or pipe to'be pulled and into which the spear is inserted, the abutment of this shoulderwith the casing preventing the spear being lowered too far into said casing. The collar therefore, actsas a rest or support for centering the spear and for lining it up with the pipe or casing to be removed from the hole.

The mandrel is formed with an elongated tapering shank 13 which fits the tapering portion of the cylindrical bore 7 and which is pointed at its extremity as indicated at 14., this shank serving to guide the mandrel into the bore of the cylinder. Above the tapered shank, themandrel is provided with a straight stock 15 of uniform diameter which has a sliding fit with the straight bored cylindrical portion 1. The stock is provided with a stud connection in the form of a threaded end 16 formed integral with the stock at its outer end, the stud being of smaller diameter than the, stock and tapering upwardly from the anvil shoulder 17 at its base for threaded engagement with an extension to be screwed thereon and by means of which extension the mandrel is properly supported and manipulated at considerable depth. After being lowered into the cylin-- der, the mandrel is driven in place by suitable tools, the driving blows falling upon the upper extension to which the mandrel is attached, but brunt of drivingforce is sustained by the anvil shoulder 17 of the man drel against which the end of the extension which screws about the stud 16., The shockis then communicated to the strongest point of the mandrel, viz; thesolid stock while i the threads of the stud 16 are prevented by being distorted during'the pounding ac tion. As shown an enlarged head 6 is formed between the members 16 and said wrench neck 18. At a place appreciably removed from its shoulder 17 the stock adequately reduced to provide a wrenchhold 18 square in cross section, or as represented in the presentinstance, cylindrical with its outer sur- "face corrugated or otherwise roughened as at 19 to enablethe wrench to secure a firm hold when turning the mandrel for threading the pin 16 into an extension as previously referred to. When disposed within the cylinder the mandrel is supported, shown to advantage in Figure l of the drawings, with its stock embraced by the cylindrical portion 1 and its tapered guiding shank depending between the gripping sections 4t so that its pointed end l l-is in proximity to the open end of the nose of the cylinder. As the mandrel is forced further into the cylinder, the stock 15 will emerge from below the solid cylindricalportion l and cause the sections tto be spread apart, thus expanding the cylinder at its lower portion and causing the teeth of each section to bite into the pipe which it is desired to lift from the well hole. .The stock, moreover braces the secmeans of its collar 10 to a suitablecasing ortions rearwardly of their narrow or bending portions 8 during the period the sections are expanded. t

In operation the device is connected by extension and is lowered into a hole or well,

minus the mandrel, until it enters thepipe or casing'which isto be recovered; the shoulder of the collar resting upon the edge of such pipe or casing and supporting the cylinder-therein. The mandrel is then rlowered, preferably by means of a cable into the extension being guided by its shank portions and driven into the cylinder with tools, expanding the sections 2 and 4 until they are thought to have firmly gripped the pipe,

subsequent to which the entire device iswith-r drawn from the well, carrying with it the broken off or lost pipe. In case it is found that the pipe cannot,'for some reason or other be removed then the mandrel may be jerked out with the cable permitting the expanded sections to relax and thus free the pipe. The spear may then be drawn back to the top without the loss of any of its parts.

Although the foregoing may be said to comprehend the preferred embodiment of the invention, it is to be understood. that" such minor changes in the construction, com

external teeth, a tapering bore being formed in said, cylinder, a tapering shank arranged for co-action with said bore, having an extending wrench Vholdwith corrugations, an

enlarged head formed atthe upper end of said shank terminating in an anvil portion.

from which extends a threaded stud and a threaded collar held to saidcylinder where'- bysaid cylinder may be brought into engage ment with a suitable pipe, all substantially asand for the purposes set forth,

in presence of two witnesses. r

" CHARLES S/STRAIGHT.

'Witness'es: 1 7

ED Dnnssnn,

RICHARD STRAIGHT. j

- n testimony whereof I a tiix my signature

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