Automatic drilling system
First Claim
Patent Images
1. An automatic drilling system, comprising:
- an electric servo motor arranged to operate a winch brake control;
a servo controller operatively coupled to the servo motor; and
a drum position encoder rotationally coupled to a winch drum and operatively coupled to the servo controller, the servo controller adapted to operate the servo motor in response to measurements of position made by the encoder so that a selected rate of rotation of the winch drum is maintained.
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Abstract
An automatic drilling system is disclosed which includes an electric servo motor operatively coupled to a winch brake control, a servo controller operatively coupled to the servo motor, and a drum position encoder rotationally coupled to a winch drum. The controller is adapted to operate the servo motor in response to measurements of position made by the encoder so that a selected rate of rotation of the drum is maintained.
104 Citations
22 Claims
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1. An automatic drilling system, comprising:
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an electric servo motor arranged to operate a winch brake control; a servo controller operatively coupled to the servo motor; and a drum position encoder rotationally coupled to a winch drum and operatively coupled to the servo controller, the servo controller adapted to operate the servo motor in response to measurements of position made by the encoder so that a selected rate of rotation of the winch drum is maintained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for controlling a rate of release of a drill string, comprising:
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measuring a parameter related to rotational position of a drawworks drum; measuring a parameter related to operating position of a drawworks brake; determining a rate of rotation of the drum from the rotational position related parameter measurement; and adjusting the operating position of the brake so as to substantially maintain the rate of rotation at a selected value using the measured operating position parameter and the measured rotational position parameter.
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18. An automatic drilling system, which comprises:
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an electric servo motor coupled to a drawworks winch drum brake actuator so as to operate the actuator; means for determining drawworks winch drum speed of rotation; and means for controlling said servo motor based upon a difference between said drawworks winch drum speed of rotation and a speed of rotation set point. - View Dependent Claims (19, 20, 21, 22)
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Specification