Sub-Surface Rod Pumps

The rod pump is connected to the sucker rod after being assembled on the surface then it is lowered down to the well bottom through the tubing. Thus it is convenient for inspection and workover because it can be pulled up and down through the tubing and is therefore suitable for deeper well. The lifespan of the tubing can also be prolonged due to the reduction of the number of makeup cycles. The rod pump can be classified into two types: mechanical seating and cup seating. Also it is divided into three types: RHA (stationary heavy well barrel top anchor rod pump), RHB (stationary heavy well barrel bottom anchor rod pump) and RHT (traveling heavy well barrel bottom anchor rod pump).