Rotary Steerable Tool Actuator Tool Face Control
AssigneeSchlumberger Technology Corporation
InventorsMartin Thomas Bayliss, Edward Charles Langden Richards, Christopher Wallwork
Life of this patent
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Abstract
A technique facilitates controlling the direction of drilling when using a rotary steerable system to drill a borehole. The method comprises processing parameters related to operation of a rotatable collar of the rotary steerable system. The parameters are used in cooperation with characteristics of actuators to control the positioning of an actuator tool face which, in turn, controls the drilling orientation of the rotary steerable system.
Claims22
A method for controlling a drilling direction of a rotary steerable system having a rotatable collar and a sleeve pivoted by bi-stable valve actuators to control the drilling direction, comprising:
- determining an angular collar speed of a rotary steerable system;
- establishing a transition angle interval for each bi-stable valve actuator as each bi-stable valve is switched between off and on states;
- and
- using the angular collar speed and the transition angle of each bi-stable valve actuator to control a desired dwell angle interval for each bi-stable valve actuator.
A method of controlling an actuator tool face in a rotary steerable system, comprising:
- inputting a demand tool face;
- estimating a collar angular position and a collar angular rate for processing by an actuator tool face controller;
- and
- determining firing times of a plurality of actuators used to control the actuator tool face based on the collar angular position, the collar angular rate, and selected parameters.
A method of controlling a drilling direction during drilling of a wellbore, comprising:
- employing a rotary steerable system having a sleeve which may be articulated about a joint to control drilling direction;
- articulating the sleeve with a plurality of actuators;
- and
- controlling each actuator of the plurality of actuators by:
- processing a plurality of parameters with an actuator tool face controller, wherein processing comprises employing an algorithm to evaluate on and off angular tool face firing angles at each actuator of the plurality of actuators;
- and
- determining firing times of each actuator of the plurality of actuators to control a tool face angle based on the plurality of parameters.
Dependencies are inferred from the claim text.