Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1992-04-13
1994-01-25
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 22, 417 46, 417399, 60372, F04B 4900
Patent
active
052811000
ABSTRACT:
A well pumping system includes a pivotally mounted walking beam and "horsehead" connected to a downhole pump by a pump rod in the conventional manner. A hydraulic lift piston and cylinder and a pneumatic balance piston and cylinder are connected to the walking beam. A process control computer controls input signals to a hydraulic control valve for controlling the hydraulic cylinder rate and direction of travel to provide corresponding control over the motion of the walking beam. The computer receives input information from a position sensor indicating the displacement of the beam in its range of travel. The computer program also is responsive to a timer for determining actual stroke rate and acceleration of the beam. The computer monitors and controls operation of the hydraulics and pneumatics as the pumping unit produces the lift necessary to extract fluid from the well. The computer controls acceleration and deceleration of the walking beam assembly in accordance with a desired acceleration-versus-time and deceleration-versus-time waveform. Closed loop control is used to cause actual beam displacement, displacement rate and acceleration to follow a desired displacement, rate, and acceleration profile. As a result, any sudden movement or directional change is eliminated, and the system reduces energy consumption and wear and tear on the pumping equipment.
REFERENCES:
patent: 3971213 (1976-07-01), Kelly
patent: 4286925 (1981-09-01), Standish
patent: 4406122 (1983-09-01), McDuffie
patent: 4483662 (1984-11-01), Stanton
patent: 4530645 (1985-07-01), Whatley et al.
patent: 4990058 (1991-02-01), Eslinger
A.M.C. Technology, Inc.
Bertsch Richard A.
Scheuermann David W.
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