Well drilling tool

Details Well drilling tool Well drilling tool

E - Fixed Constructions

21

B

255/12

E21B 4/00 (2006.01) E21B 4/02 (2006.01)

Patent

CA 1054137

WELL TOOL Abstract of the Disclosure There are disclosed several embodiments of a well tool which is adapted to be connected as part of a pipe string through which drilling fluid is cir- culated, and which comprises inner and outer members which are rotated with respect to one another by a motor between them.

251230

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