Deviated drilling system utilizing steerable bias unit
AssigneeSchlumberger Technology Corporation
InventorMichael Pearce
Life of this patent
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Abstract
A technique facilitates steering during, for example, a borehole drilling operation. The technique employs a drill string comprising a drill bit and a steering tool for controlling the trajectory of a borehole formed by rotating the drill bit. The steering tool includes a main body and a steering sleeve pivotably mounted to the main body by a joint located to enable pushing contact via the steering sleeve against a surrounding borehole wall at a location between the joint and the drill bit. The steering sleeve is selectively pivoted by a plurality of actuators disposed between the main body and the steering sleeve.
Claims20
A system for use in a well, comprising:
- a drill string comprising a drill bit and a steering tool for controlling the trajectory of a borehole formed by rotating the drill bit, the steering tool comprising a main body and a steering sleeve pivotably mounted to the main body by a joint located to enable pushing contact via the steering sleeve against a surrounding borehole wall at a location between the joint and the drill bit, the steering sleeve being selectively pivoted by a plurality of actuators disposed between the main body and the steering sleeve.
A method, comprising:
- pivotably coupling a steering sleeve, having a sacrificial liner, to a main body to form a steering tool;
- using a sacrificial liner positioned along an interior of the steering sleeve;
- locating a plurality of actuators between the main body and the steering sleeve;
- coupling the steering tool to a drill bit;
- rotating the drill bit;
- and
- controlling the drilling orientation of the drill bit by selectively actuating selected actuators of the plurality of actuators to cause the steering sleeve to pivot against a surrounding borehole wall, thus pushing the drill bit.
A system, comprising:
- a steering tool operable to control a trajectory of a borehole during drilling of the borehole, the steering tool comprising:
- a main body;
- and
- a steering sleeve pivotably mounted to the main body by a gimbal joint to enable pushing contact via the steering sleeve against a surrounding borehole wall, the steering sleeve being selectively pivoted by a plurality of actuators disposed between the main body and the steering sleeve.
Dependencies are inferred from the claim text.