Control of hydraulic power flowrate for managed pressure drilling
First Claim
1. A method of drilling a wellbore with a drilling system having at least one choke, the method comprising:
- controlling a parameter in the drilling system using the at least one choke by operating the at least one choke with at least one choke control value;
storing an opening speed of the at least one choke; and
maintaining an opening response of the at least one choke consistent over time during operation by at least periodically performing the steps comprising;
measuring a first time for the at least one choke to at least reach a first position during an opening operation;
calculating a current opening speed of the at least one choke based on the measured first time to at least reach the first position; and
adjusting the at least one choke control value for the at least one choke based on the current opening speed differing from the stored opening speed.
8 Assignments
0 Petitions
Accused Products
Abstract
An assembly uses a choke to control flow of wellbore fluid in a drilling system. A controller operatively coupled to the choke can control opening/closing of the choke with hydraulic power and an actuator. The control operates the opening/closing of the choke with a choke control value to control a parameter in the drilling system, such as pressure or flow. The control measure a time for the choke to at least reach a position toward a full open/closed position during a full opening/closing operation and calculates a current opening/closing speed of the choke. When this current speed is compared to a previously stored speed, the control adjusts the choke control value for the choke based on any difference.
14 Citations
21 Claims
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1. A method of drilling a wellbore with a drilling system having at least one choke, the method comprising:
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controlling a parameter in the drilling system using the at least one choke by operating the at least one choke with at least one choke control value; storing an opening speed of the at least one choke; and maintaining an opening response of the at least one choke consistent over time during operation by at least periodically performing the steps comprising; measuring a first time for the at least one choke to at least reach a first position during an opening operation; calculating a current opening speed of the at least one choke based on the measured first time to at least reach the first position; and adjusting the at least one choke control value for the at least one choke based on the current opening speed differing from the stored opening speed. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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3. The method 1, wherein controlling the parameter in the drilling system using the at least one choke comprises at least one of:
- controlling surface back pressure in the wellbore;
controlling flow rate of drilling fluid out of the wellbore;
controlling pressure during a drillpipe connection while drilling with the drilling system;
controlling pressure during a loss detected while drilling with the drilling system; and
controlling flow during a kick detected while drilling with the drilling system.
- controlling surface back pressure in the wellbore;
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14. A method of drilling a wellbore with a drilling system having at least one choke, the method comprising:
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controlling a parameter in the drilling system using the at least one choke by operating the at least one choke with at least one choke control value; storing a closing speed of the at least one choke; and maintaining a closing response of the at least one choke consistent over time during operation by at least periodically performing the steps comprising; measuring a time for the at least one choke to at least reach a first position during a closing operation; calculating a current closing speed of the at least one choke based on the measured time to at least reach the first position; and adjusting the at least one choke control value for the at least one choke based on the current closing speed differing from the stored closing speed. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An assembly used with a drilling system for drilling a wellbore, the assembly comprising:
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at least one choke operable to control a parameter in the drilling system; at least one actuator disposed with the at least one choke and actuating operation of the at least one choke in response to supplied power; and a controller operatively coupled to the at least one actuator, the controller controlling the supplied power to the at least one actuator and controlling opening and/or closing of the at least one choke therewith, the controller configured to; operate opening and/or closing of the at least one choke with at least one choke control value to control the parameter in the drilling system; store an opening and/or closing speed of the at least one choke; at least periodically perform a calibration to maintain an opening or closing response of the at least one choke consistent over time during operation, the controller in the calibration configured to; measure a time for the at least one choke to at least reach a position during an opening and/or closing operation; calculate a current opening/closing speed of the at least one choke based on the measured time to at least reach the position; and adjust the at least one choke control value for the at least one choke based on the current opening and/or closing speed differing from the stored opening and/or closing speed.
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21. A control of at least one choke used in a drilling system for drilling a wellbore, the control comprising:
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storage storing an opening and/or closing speed of the at least one choke and storing at least one choke control value for operating the at least one choke; and a programmable control device operatively coupled to the storage and to the at least one choke, the programmable control device being operable to; operate opening and/or closing of the at least one choke with the at least one choke control value to control a parameter in the drilling system; at least periodically perform a calibration to maintain an opening or closing response of the at least one choke consistent over time during operation, the programmable control device in the calibration configured to; measure a time for the at least one choke to at least reach a position during an opening/closing operation; calculate a current opening and/or closing speed of the at least one choke based on the measured time to at least reach the position; and adjust the at least one choke control value for the at least one choke based on the current opening and/or closing speed differing from the stored opening and/or closing speed.
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Specification