Liquid driven downhole drilling machine

Details Liquid driven downhole drilling machine Liquid driven downhole drilling machine

2006-05-09

2006-05-09

Gay, Jennifer H. (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S298000, C175S417000, C173S019000, C173S091000

Reexamination Certificate

active

07040421

ABSTRACT:
In a liquid downhole drilling machine, the guiding bushing (31) for the drill bit is rotatably journaled in the housing (11, 12) and, via a one-way coupling (29), coupled to a turning sleeve (22) that has axial ridges (24) that bound a number of chambers (25, 26, 27) and form turning pistons for turning the turnable sleeve to and fro. A number of these chambers are coupled to be pressurized and depressurized simultaneously with said pressure chamber (47) with the piston area (46) for urging the piston hammer (30) forwards. As a result, the drill bit (13) will be indexed a defined angle between each impact so that the button inserts of the drill bit will change contact points with the rock between every impact and fragment the rock efficiently. The drill tube is not rotated.

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