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US 10,689,910 B2Granted
Bi-directional drilling systems and methods
AssigneeSchlumberger Technology Corporation
InventorsSiamak Dadkhah, Geoffrey Charles Downton, Adam Ian Bowler
Life of this patent
Estimating the term…
Abstract
A method for removing material with a bit includes rotating a bit in a first direction, changing the rotational direction and rotating the bit in an opposing second direction. Rotation of the bit in the first direction and rotation of the bit in the second direction both remove material.
Claims19
A method of removing material with a bit, the method comprising:
- rotating a top drive in a first rotational direction, wherein rotating the top drive in the first rotational direction includes rotating the bit in the first rotational direction for a first duration of time;
- removing material from a wellbore surface for at least a portion of the first duration of time;
- reversing a rotational direction of the top drive, wherein reversing the rotational direction of the top drive includes reversing the rotational direction of the bit;
- rotating the top drive in a second rotational direction, wherein rotating the top drive in the second rotational direction includes rotating the bit in the second rotational direction for a second duration of time;
- and
- removing material from the wellbore surface for at least a portion of the second duration of time.
3 more elements
A method of rotating a bit, the method comprising:
- applying a first torque to a top of a drill string in a first rotational direction;
- holding substantially the first torque for a first duration of time;
- applying a second torque in the first rotational direction to the top of the drill string to mitigate stick slip, at least one of the first torque or the second torque causing a bit to rotate in the first rotational direction;
- holding substantially the second torque for a second duration of time;
- applying a third torque in a second rotational direction opposite to the first rotational direction to the top of the drill string in the second rotational direction;
- holding substantially the third torque for a third duration of time;
- applying a fourth torque in the second rotational direction to the top of the drill string, at least one of the third or the fourth torque causing the bit to rotate in the second rotational direction;
- and
- holding substantially the fourth torque for a fourth duration of time.
6 more elements
A system for rotating a bit:
- a drilling tool assembly, the drilling tool assembly including:
- a drill string, and
- a bit connected at an end of the drill string, wherein the bit includes a plurality of cutting elements having a neutral rake angle;
- and
- a top drive configured to alternately apply a drive torque to the bit through the drill string in a first rotational direction and in an opposing second rotational direction.
2 more elements
Dependencies are inferred from the claim text.