Rod pump beam position determination from motor power

Details Rod pump beam position determination from motor power Rod pump beam position determination from motor power

G - Physics

01

B

G01B 7/14 (2006.01) F04B 47/02 (2006.01) F04B 49/06 (2006.01)

Patent

CA 2119907

ROD PUMP BEAM POSITION DETERMINATION FROM MOTOR POWER Abstract of the Disclosure An electric contactor for the motor of a reciprocating pump such as an oil well walking beam pump, and other cyclic loads, uses the power drawn by the load to determine the phase angle of the pump without the need for a separate phase signalling sensor. The contactor couples the electric pump motor to a power line, and has a power sensor and peak detector. The power sensor can be responsive to RMS AC power or simply to current amplitude and polarity. The motor passes through a minimum power at the extreme top and bottom of a pump stroke, and the phase position at the top of the stroke is preferably detected by sensing for the power reversal that occurs as the momentum of the pump causes regeneration by the motor. The contactor can have overcurrent and/or undervoltage protection features, can include contacts for rearranging the motor windings to vary pump operation, and can report the phase to a pump control and monitoring system, whereby process variables are assessed as a function of phase.

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