Releasable drill string device and method

Details Releasable drill string device and method Releasable drill string device and method

1981-12-15

1984-03-13

Purser, Ernest R.

Wells

Processes

Disassembling well part

29460, 175325, 175 17, 166 61, E21B 1710

Patent

active

044361580

ABSTRACT:
A drill string working tool is provided that may be releasably engaged to and removed from a drill string member. The tool, such as a cylindrical stabilizer body, is positioned around a cylindrical drill string member, the inner diameter of the stabilizer body being greater than the outer diameter of the drill string member, so as to provide an annular cavity between the stabilizer body and the drill string member. A heating element disposed within a protective outer sheath is mounted axially along the inner surface of the stabilizer body. For installation, a low melting point solid material such as zinc or a zinc alloy is poured in to substantially fill the annular cavity. The stabilizer compression preloads the zinc onto the drill string member, and thus the stabilizer body is non-rotatably attached to the drill string member. For removal, the low melting point fill material is removed from the annular cavity by remelting with the interior heating element and pouring out the fill material. The stabilizer body can then be released and slipped off the drill string member.

REFERENCES:
patent: 1617489 (1927-02-01), Lightfoot
patent: 1863855 (1932-06-01), Jenkins
patent: 2499456 (1950-03-01), Browne
patent: 2756474 (1956-07-01), Steinmetz
patent: 2955338 (1960-10-01), Gough
patent: 2992838 (1961-07-01), Wallace
patent: 3193918 (1965-07-01), Heldenbrand
patent: 3499210 (1970-03-01), Schellstede et al.
patent: 3578084 (1971-05-01), Bombardieri et al.
patent: 3664693 (1972-05-01), Irons
patent: 4323526 (1982-04-01), Hilbush

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