Method and apparatus for drilling curved boreholes

Details Method and apparatus for drilling curved boreholes Method and apparatus for drilling curved boreholes

2008-05-20

2008-05-20

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S073000

Reexamination Certificate

active

07373995

ABSTRACT:
The invention is an improved rotary steerable tool. The improved rotary steerable tool comprises a control tube that slides vertical within a mandrel in response to changes in drilling fluid pressure, thereby opening and closing a channel between the mandrel and a piston chamber in a rotationally isolated sleeve. With the channel open, a piston in the piston chamber is exposed to the drilling fluid. When the drilling pressure is sufficient to cause the piston to move, the piston forces a deflection pad outward. After the deflection pad engages a borehole wall, any additional increases in pressure force the opposing side of sleeve toward the opposite wall, thereby tilting the direction of any attached drill bit. An optional guide lug and alignment sleeve orient the deflection pad with respect to other components.

REFERENCES:
patent: 3298449 (1967-01-01), Bachman et al.
patent: 5293945 (1994-03-01), Rosenhauch et al.
patent: 5941321 (1999-08-01), Hughes

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