Method for mitigating rod float in rod pumped wells

Details Method for mitigating rod float in rod pumped wells Method for mitigating rod float in rod pumped wells

2005-09-16

2009-06-16

Kramer, Devon C (Department: 3746)

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

C417S042000, C417S053000

Reexamination Certificate

active

07547196

ABSTRACT:
Rod Float Mitigation (RFM) methods for rod-pumped oil wells having a variable frequency drive which controls the speed of the motor for the pump. Each method monitors rod loads or a similar condition and takes action only when rod load drops below a predefined minimum load. A first method reduces the speed of the motor to a preset level. A second method fixes the torque level on the pump downstroke by adjusting motor speed based on a calculated gearbox torque compared to a programmed fixed limit. Another method includes a program in the variable frequency drive which includes a preferred RFM Torque Curve for the pump to follow on its downstroke. When rod float occurs, the program monitors gearbox torque and adjusts the speed to follow the predetermined RFM Torque Curve thereby mitigating rod float with minimum decrease in production.

REFERENCES:
patent: 4971522 (1990-11-01), Butlin
patent: 6414455 (2002-07-01), Watson
patent: 6506030 (2003-01-01), Kottke

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