Apparatus for eliminating net drill bit torque and...

Details Apparatus for eliminating net drill bit torque and... Apparatus for eliminating net drill bit torque and...

2006-12-07

2009-11-03

Gay, Jennifer H (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S024000, C175S027000, C175S073000

Reexamination Certificate

active

07610970

ABSTRACT:
A drilling apparatus controls or eliminates reaction torque from drill bits thereby preventing loss of penetration due to undesired rotation of the drilling apparatus or controls drilling direction by intentionally manipulating reaction torque thereby inducing desired drill bit walk. The drilling apparatus has a concentrically divided drill bit in which an inner drill bit rotates simultaneously in the opposite direction from an outer drill bit. The inner drill bit can be moved axially forward from or back toward the outer drill bit. Forces produced by the inner and outer drill bits are controlled to eliminate or adjust reaction torque.

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patent: WO 2008/004999 (2008-01-01), None
Southard, “New Assembly Drills without Reactive Torque”, SPE/IADC 105000, 2007.
Eskin et al., “Former-USSR R&D on Novel Drilling Techniques”, Chapter 1.8 Large-Hole Stepwise Drilling Technique by Dr. V. Zaretsky, pp. 1.8-1-1.8-9. Copyright 1995 Maurer Engeineering Inc.

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