Why Do We Counterbalance Sucker Rod Pumping Units?

A good understanding of counterbalance is vital to the successful operation of surface sucker rod pumping units.  Poor counterbalance practices can cause early failure of the gear reducer gearing and will result in excessive energy cost.

Non-counterbalanced lever system:

The up-stroke:

The figure above represents a simple non-counterbalanced lever system. On the up-stroke, by pulling down on the end of a beam, a man is lifting a bucket full of water having a combined weight of 150 lbs.

Note that the upstroke effort of the man is a substantial 150 lbs.

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Rod Rotator extends the life of rod-pumped wells

The constant up-and-down movement of a sucker rod creates excessive friction between rods and tubing which can result in premature rod and tubing failures due to excessive wear. If left unchecked, this generally requires a costly intervention to make repairs.

To extend the sucker rod run life, one of the widely used techniques is the use of rod rotators. A rod rotator is a mechanical device installed on the polished rod between the carrier and the polished rod clamp. It incrementally rotates the rod with each stroke. A rotating mechanism with an actuator lever arm is connected to the walking beam with a metal string. As the surface unit moves up and down, it pulls and releases this metal string so that, moves the actuator lever arm up and down. The rotation mechanism is activated and this slowly rotates the polished rod and the rod string below.

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