Mud motor control using eccentricity measurement
AssigneeSchlumberger Technology Corporation
InventorsSamba Ba, Maxim Pushkarev, Anton Kolyshkin
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Abstract
A method, system, and computer-readable medium related to control of mud motors in drilling systems, of which the method includes measuring an eccentricity of rotation of a rotor in a stator of a mud motor using a rotor-position sensor, determining a torque of the mud motor based in part on the eccentricity, and selecting a fluid flow rate, a pressure, or both of fluid delivered downhole, through the mud motor, based in part on the determined torque.
Claims20
A method, comprising:
- measuring an eccentricity of rotation of a rotor in a stator of a mud motor using a rotor- position sensor;
- determining a torque of the mud motor based in part on the eccentricity;
- and
- adjusting operation of a pump configured to deliver fluid downhole to the mud motor, based in part on the determined torque, wherein adjusting operation of the pump comprises adjusting a pressure of the fluid at the pump, a fluid flow rate at the pump, or both.
A system, comprising:
- a mud motor having a rotor, a stator, and a rotor-position sensor, wherein the rotor is configured to rotate eccentrically with respect to the stator, and wherein the rotor-position sensor is configured to measure an eccentricity of the rotation of the rotor with respect to the stator;
- a pump configured to deliver fluid to the mud motor, wherein the fluid delivered to the mud motor causes the rotor to rotate;
- and
- a controller in communication with the pump and the rotor-position sensor, wherein the controller is configured to receive measurements representing the eccentricity from the rotor-position sensor, and wherein the controller is configured to determine a torque of the mud motor based on the eccentricity.
A non-transitory, computer-readable medium storing instructions that, when executed by a process of a computing system, cause the computing system to perform operations, the operations comprising:
- determining an eccentricity of rotation of a rotor in a stator of a mud motor based on measurements received from a rotor-position sensor;
- determining a torque of the mud motor based on the eccentricity;
- and
- adjusting operation of a pump configured to deliver fluid downhole to the mud motor, based on the determined torque, wherein adjusting operation of the pump comprises adjusting a pressure of the fluid at the pump, a fluid flow rate at the pump, or both.
Dependencies are inferred from the claim text.