Method of using a drill string tool

Details Method of using a drill string tool Method of using a drill string tool

1998-02-25

2000-07-04

Bagnell, David

Wells

Processes

Freeing stuck object, grappling or fishing in well

464 18, 175106, 175306, 166178, 166312, E21B 2300, E21B 3100

Patent

active

060824573

ABSTRACT:
A method of operating a drill string tool for use in a wellbore formed in an earth formation is provided. T he method comprises rotating an upper drill string part while a rotation transfer assembly transfers the rotation of a first element to a second element so as to rotate a lower drill string part in order to drill a section of a wellbore, inducing a controller to disengage the rotation transfer assembly so as to allow the first element to rotate relative to the second element by virtue of bearings, and rotating the upper drill string part about its longitudinal axis while the lower drill string part remains substantially stationary.

REFERENCES:
patent: 4573536 (1986-03-01), Lawrence
patent: 4576229 (1986-03-01), Brown
patent: 4728124 (1988-03-01), Righi et al.
patent: 4890682 (1990-01-01), Worrall et al.
patent: 4958691 (1990-09-01), Hipp
patent: 5431221 (1995-07-01), Roberts et al.
patent: 5669455 (1997-09-01), Dietrich
patent: 5857710 (1999-01-01), Leising et al.

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