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.