Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1992-08-07
1994-05-17
Britts, Ramon S.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, 175107, 1753251, E21B 706
Patent
active
053119533
ABSTRACT:
For steering a drill bit, a trajectory control sub has a lower part adjustable relative to the upper part to produce an axial bend to angularly offset the drill bit so that drilling proceeds along a curved path. Adjustable stabilizer blades are mounted on the sub and are movable between extended positions and retracted positions. An actuator is provided which selectively maintains the drill bit in axial alignment with the section of borehole being drilled, and which is actuable to move the blades into their retracted positions and subsequently, with the blades in their retracted positions, to effect tilting of the lower part relative to the upper part to produce the axial bend leading to tilting of the drill bit.
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WO/9108370, Johannes Van Den Bergh, et al., Device for Steering the Foremost Part of a Drill Pipe, Jun. 13, 1991.
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Baroid Technology Inc.
Britts Ramon S.
Tsay Frank S.
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