oil pump jack listings
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Pumpjacks (also known as nodding donkeys, pumping units, horsehead pumps, beam pumps, sucker rod pumps (SRP), grasshopper pumps, thirsty birds and jack pumps) are the overground drives for a reciprocating piston pump installed in an oil well. It is used to mechanically lift liquid out of the well if there is not enough bottom hole pressure for the liquid to flow all the way to the surface. The arrangement is commonly used for onshore wells producing relatively little oil. Pumpjacks are common in many oil-rich areas, dotting the countryside and occasionally serving as local landmarks.
Depending on the size of the pump, it generally produces 5 to 40 litres of a crude oil-water mixture (called emulsion) at each stroke. The size of the pump is also determined by the depth and weight of the oil to be removed, with deeper extraction requiring more power to move the heavier lengths of sucker rods (see diagram at right).
A pumpjack converts the rotary mechanism of the motor to a vertical reciprocating motion to drive the pump shaft, and is exhibited in the characteristic nodding motion. The engineering term for this type of mechanism is a walking beam. It was often employed in stationary and marine steam engine designs in the 1700s and 1800s.
oil pump jack
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