Apparatus for retrieving pipe sections from a well bore

Details Apparatus for retrieving pipe sections from a well bore Apparatus for retrieving pipe sections from a well bore

1985-03-01

1990-11-13

Leppink, James A.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

166 557, 294 8634, E21B 2908

Patent

active

049695142

ABSTRACT:
An apparatus for retrieving a pipe section from a well bore includes a structure to be connected to the lower end of a drilling string. The structure includes a cutter at its lower end and a controllable gripping member for gripping the interior of a pipe section. The gripping member is located above the cutter and is adapted to grip the interior of the pipe. The gripping member is such that when in a gripping condition the gripping member remains stationary while the drilling string and the cutter are rotated.

REFERENCES:
patent: 1830207 (1931-11-01), Mueler
patent: 1867289 (1932-07-01), Ventresca
patent: 2117050 (1938-05-01), Wilson
patent: 3747674 (1973-07-01), Murray
patent: 3983936 (1976-10-01), Kennard et al.
patent: 4047568 (1977-09-01), Aulenbacher
patent: 4099561 (1978-07-01), Nelson
patent: 4191255 (1980-03-01), Rives
patent: 4550781 (1985-11-01), Kagler, Jr.

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