Methods and apparatus for drilling directional wells by...

Details Methods and apparatus for drilling directional wells by... Methods and apparatus for drilling directional wells by...

2008-02-08

2010-11-16

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S298000

Reexamination Certificate

active

07832502

ABSTRACT:
The present invention generally relates to methods and apparatus for impact drilling. A drilling tool with a housing and a piston is provided. The drilling tool may be configured to impact while simultaneously rotating a drill head, independent from the rotation of a drill string. The drilling tool may include a rolling key assembly disposed between the housing and the piston that includes a bearing adapted to roll during a first direction of the piston and slide during a second direction of the piston. The drilling tool may include a clutch mechanism configured to rotate the drill head as the piston is directed in the first direction.

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patent: WO 95/04207 (1995-02-01), None
PCT Search Report, International Application No. PCT/US2009/033460/ dated Jun. 26, 2009.

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