Method of and apparatus for directional drilling
AssigneeNoble Engineering & Development, Ltd.
InventorsMarc Haci, Eric E. Maidla
Life of this patent
Estimating the term…
Abstract
A method of and system for directional drilling reduces the friction between the drill string and the well bore. A downhole drilling motor is connected to the surface by a drill string. The drilling motor is oriented at a selected tool face angle. The drill string is rotated at said surface location in a first direction until a first torque magnitude without changing the tool face angle. The drill string is then rotated in the opposite direction until a second torque magnitude is reached, again without changing the tool face angle. The drill string is rocked back and forth between the first and second torque magnitudes.
Claims20
A method of drilling a well, which comprises:
- (a) orienting a downhole drilling motor at a selected face angle, said drilling motor being connected by a drill string to a surface drilling location;
- (b) rotating said drill string at said surface location in a first direction until a first measured torque magnitude is reached at said surface location;
- and then,
- (c) rotating said drill string in the direction opposite said first direction until a second measured torque magnitude is reached at said surface location.
A method of drilling a well, which comprises:
- (a) determining the face angle of a downhole drilling motor, said downhole drilling motor being connected to a surface location by a drill string;
- (b) rotating said drill string at said surface location in a first direction until a first measured torque magnitude is reached at said surface location without changing said face angle;
- and then
- (c) rotating said drill string in the direction opposite said first direction until a second measure torque magnitude is reached at said surface location without changing said face angle.
A directional drilling system, which comprises:
- a torque sensor for determining torque applied to a drill string by rotating means;
- a controller for operating said rotating means to rotate said drill string in a first direction until a first torque magnitude is determined and then in a direction opposite said first direction until a second torque magnitude is determined.
Dependencies are inferred from the claim text.