System and method for forming an underground bore

Details System and method for forming an underground bore System and method for forming an underground bore

2007-06-12

2007-06-12

Neuder, William (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S073000

Reexamination Certificate

active

10838512

ABSTRACT:
A system for drilling a substantially horizontal borehole, comprises a rotating drill string extending from a surface system to a location in the horizontal borehole, the drill string having a drill bit at a bottom end. A rotary steerable system in the drill string proximate the drill bit is adapted to direct the rotating drill string toward a desired exit point. In another aspect, a method for drilling a substantially horizontal borehole from a surface location to an offshore exit location, comprises drilling a borehole using a rotary steerable system to direct the borehole along a predetermined trajectory toward the exit location. The borehole is reamed from the surface location toward the exit location while recovering a drilling fluid at the surface location.

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