Method and apparatus for sonically extracting oil well liners

Details Method and apparatus for sonically extracting oil well liners Method and apparatus for sonically extracting oil well liners

1978-04-04

1980-12-02

Leppink, James A.

Wells

Processes

Freeing stuck object, grappling or fishing in well

166177, 175 56, E21B 3100

Patent

active

042365805

ABSTRACT:
A column of elastic material such as steel is lowered into an oil well by means of a derrick to a position such that the end portion thereof is within a liner to be removed. The end portion of the column has clamping means thereon which are employed to tightly clamp the column to the liner. High level and variable resonant sonic energy is then applied to the column from the surface and transmitted along the column to the liner. The sonic energy operates to loosen the liner from the surrounding earthen material which usually has an adhesive tarry substance which tightly holds the liner. Vertical bias force, which may be varied from time to time to apply variable bias both upwardly and downwardly, as well as torsional bias in some instances are employed to aid in loosening the liner, the sonic energy operating to hysteresis heat the tarry adhesive until it softens and the liner can be removed by drawing the column upwardly with the derrick.

REFERENCES:
patent: 463048 (1891-11-01), Hanlen
patent: 2139076 (1938-12-01), Gates
patent: 2808887 (1957-10-01), Erwin
patent: 2842207 (1958-07-01), Alexander
patent: 2972380 (1961-02-01), Bodine, Jr.
patent: 2998067 (1961-08-01), Kerver
patent: 3023811 (1962-03-01), Green
patent: 3217803 (1965-11-01), Winger
patent: 3268003 (1966-08-01), Essary
patent: 3399724 (1968-09-01), Brooks

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