Reciprocating pump control system
First Claim
Patent Images
1. A control system for varying the rod speed of a pumping unit having a geometry and comprising a variable speed motor and rotating crank arm:
- (a) a variable frequency drive for providing a speed setpoint to the motor;
(b) a controller operatively connected to the variable frequency drive comprising means for outputting a speed setpoint in accordance with a crank speed profile which is non-constant within a single cycle; and
(c) a processor comprising means for creating a the crank speed profile and communicating the crank speed profile to the controller.
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Abstract
A pumpjack speed control system includes a user interface, a controller and a variable speed drive. The user interface includes a mathematical representation of the pumpjack geometry which permits the conversion of rod speed profiles to crank speed profiles.
44 Citations
14 Claims
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1. A control system for varying the rod speed of a pumping unit having a geometry and comprising a variable speed motor and rotating crank arm:
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(a) a variable frequency drive for providing a speed setpoint to the motor;
(b) a controller operatively connected to the variable frequency drive comprising means for outputting a speed setpoint in accordance with a crank speed profile which is non-constant within a single cycle; and
(c) a processor comprising means for creating a the crank speed profile and communicating the crank speed profile to the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling the rod speed of a pumping unit having a geometry and comprising a variable frequency drive, a variable speed motor and a rotating crank arn, the method comprising the steps of:
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(a) creating a mathematical model of the pumping unit geometry;
(b) receiving from a user a rod speed profile or a crank speed profile which is non-constant within a single cycle;
(c) converting a rod speed profile to a crank speed profile which is non-constant within a single cycle using the mathematical model, if a rod speed profile is received; and
(d) outputting a speed setpoint to the variable frequency drive in accordance with the crank speed profile. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification