E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
294/11, 255/91
E21B 31/20 (2006.01) E21B 4/18 (2006.01) E21B 17/02 (2006.01) E21B 31/00 (2006.01)
Patent
CA 1306458
ABSTRACT A tool is intended for use in an oil or gas well to re- trieve a drilling or production string from the well, particularly in a situation where the casing or for- mation has collapsed, thus gripping the drilling or pro- duction string. The tool has a driven member which pre- sents, at its lower end, a self-tapping thread such as a counterclockwise self-tapping thread. The tool in- cludes a ratcheting arrangement which can drive the driven member in a counter-clockwise direction when the tool is lowered relative to the driven member. The tool can be repeatedly raised and lowered thus enabling the selftapping thread to be engaged with the top of the drilling or production string.
587939
Ridout & Maybee Llp
Smith International (north Sea) Limited
LandOfFree
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