Pad in Bit Articulated Rotary Steerable System
AssigneeSchlumberger Technology Corporation
InventorMartin Thomas Bayliss
Life of this patent
Estimating the term…
Abstract
A rotary steerable system (RSS) including an upper stabilizer connected to a collar of a drill string, an articulated section connected by a flexible joint to the collar, a drill bit connected to the articulated section opposite from the flexible joint, a lower stabilizer located proximate to the flexible joint and an actuator located with the articulated section and selectively operable to tilt an axis of the drill bit and the articulated section relative to the collar. A method includes drilling with the RSS a bias phase of a drilling cycle on a demand tool face and drilling a neutral phase of the drilling cycle on a 180 degree offset tool face from the demand tool face.
Claims20
A rotary steerable system, comprising:
- an upper stabilizer connected to a collar of a drill string;
- an articulated section connected by a flexible joint to the collar;
- a drill bit connected to the articulated section opposite from the flexible joint;
- a lower stabilizer located proximate to the flexible joint;
- and
- an actuator located with the articulated section and selectively operable to tilt an axis of the drill bit and the articulated section relative to a collar axis.
A method of drilling a well, comprising:
- drilling a borehole with a rotary steerable system (RSS) disposed on a drill string, the system comprising an upper stabilizer connected to a collar of the drill string, an articulated section connected by a flexible joint to the collar, a drill bit connected to the articulated section opposite from the flexible joint, a lower stabilizer located proximate to the flexible joint, and an actuator located with the articulated section and selectively operable during drilling to tilt an axis of the drill bit and the articulated section relative to a collar axis;
- drilling a bias phase of a drilling cycle on a demand tool face;
- and
- drilling a neutral phase of the drilling cycle on a 180 degree offset tool face from the demand tool face.
A method for estimating an optimum drilling cycle time, comprising:
- selecting a tolerance deviation of an instantaneous in plane curvature from a net equivalent curvature of a rotary steerable system;
- determining for a drilling cycle time a determined deviation of the instantaneous in plane curvature from the net equivalent curvature of the rotary steerable system for the drilling cycle for a range of steering ratios;
- comparing the determined deviation for the range of steering ratios to the tolerance deviation;
- estimating an optimum drilling cycle time as the particular drilling cycle time corresponding to the determined deviation for the range of steering ratios being below the tolerance deviation;
- and
- performing a drilling cycle using the estimated optimum drilling time while drilling a borehole with the rotary steerable system disposed on a drill string.
Dependencies are inferred from the claim text.