US1471607A - Well tool - Google Patents

Description

Patented Oct. 23, 1923.

STATES JOHN W. HOOSER, F DALLAS, 1! z *1 Z TOOL.

Application filed December 31, 1921. Serial No. 528,875.

To all whom it may camera:

Be it known that I, JoHN W. Hoosnn, a citizen of the United States, residing at Dallas in the county of Dallas and State- 6 of Texas, have invented certain new and useful Improvements in Well Tools, of which the following is a specification.

This invention relates to improvements in well tools, particularly such tools as are used in the operation of drilling wells for oil and has for its object the provision of a tool for attachment to the drill stem or cable of the well drilling apparatus or rig and lowered into the hole to withdraw or remove casing or pipe which has become broken or disconnected from the drill stem or cable of the well boring machinery.

Another advantage of the tool is its simplicity, combined with its great strength and durabilityit having also an arrangement for keeping its gripping parts free from mud, slime, or the like, to prevent slipping and enable the tool to more firmly grasp the casing to be removed. In the carrying out of the invention, there is provided a shank with a cylindrical upper portion screw-threaded for attaching to the drill stem, the lower end of the shank being broader and slightly curved to lie against the pipe coupling. To the lower extremity of the shank is attached a member which partly encloses the casing or pipe and abuts the coupling upon which the pull or strain is exerted by the tool to lift the casing.

The invention will be more clearly understood by reference to the accompanying drawing, forming part hereof, in which'- Figure 1 is a side elevationalview of the invention attached to a portion of a drill stem, the view partly broken and sectioned for the purpose of illustration.

Figure 2 is a side elevational view of the tool removed from the drill stem or cable and partly sectioned, looking at the left hand edge of the widened portion or shank.

Figure 3 is an enlarged detailed view of the lower or gripping end of the tool, attached to a portion of Well casing and showing the manner of gripping same when re moving it from the well; and

Figure 4; i a cross-sectional view of the tool, the view being taken on line 44 of Figure 1.

Referring more particularly to the draw ings, 1 denotes a portion of a drill stem, the stem in broken formation for convenience of'illustration, the lower section of which is screw-threaded for the reception of the rounded, cylindrical head 2 of the tool. 3 represents a coupling for connecting the stem and tool.

The head or rounded portion 2 of the tool is channeled as at 4, diagonally of the head 2, for admission of water for the purpose of keeping the tool free from mud, &c., to enable it to firmly engage the pipe 5.

The lower portion or shank 6 of the tool, as will be seen by reference to Figure 4, has a slight. concavo-convex formation so that the inner face 7 will closely abut the pipe coupling 8.

On the lower extremity of the shank 6 is formed a semi-circular gripping member 9 which consists of a piece of steel bent upon itself, the portion 10 forming the arc of a circle and adapted to closely engage one side of the pipe or casing 5, so that the coupling 8 will lie upon the top edge of the member 9 as shown in Figure 3 and the concavity 7 will lie against the pipe coupling 8.

In practice the tool, attached to the drill stem 1, is lowered into the well to where the casing has broken or become disconnected and which it is desired to remove, and

the tool is slipped by the Walls of the well and the casing (there usually being sufiicient space around the casing in the hole for the passage of the tool) then moved against the pipe 5 or casing until the portion 10 of the member 9 comes up under the coupling 8 and the innerface 7 of the shank 6 abuts the coupling 8. The well machinery may now be started to exert a pull upon the cable carrying the drill stem and tool, and thus lift the casing from the hole.

What is claimed is- 1. In a well tool, a shank having a threaded upper end and having a lower end of attenuated concavo-convex cross-section and a substantially U -shaped gripping member rigidly secured to the lower end of the shank at a point along one side of said 'U-shaped substantially U shaped gripping memberrigldly secured to the lower end of the shank at a point along one side of said U-shaped 1 member.

In testimony whereof I have signed my name to this specification.

JOHN W. HOOSER.

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