Downhole drilling tool

Details Downhole drilling tool Downhole drilling tool

2008-05-27

2008-05-27

Bagnell, David J. (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

With positive connection between tool and support shaft for...

C175S320000

Reexamination Certificate

active

11033576

ABSTRACT:
A downhole drilling tool136comprises a drillstring138, a drilling head140, and a freewheel144for transferring drive from the drillstring to the drilling head. The freewheel144is positioned between the drillstring138and the drilling head140.

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