Investigation and Application of Reciprocating Direct-Drive Electric Submersible Plunger Pump Lifting Technology

Abstract Aiming at the poor applicability, high unproductive energy consumption and the serious wear of the sucker and tube during the application of oil pumping units, screw pumps and electric submersible pumps in low-production and low-permeability wells, directional wells and exceptional wells, a new reciprocating direct-drive electric submersible plunger pump has been developed. For reciprocating direct-drive electric submersible plunger-pump lifting technology, the rotor of submersible linear motor is connected with the plunger of oil-well pump; cable is applied to supply electric energy for the downhole submersible linear motor; and the rotor of motor directly drives the plunger pump to reciprocate and finally realizes the lifting of the produced liquid. For this new-type lifting technology, downhole direct-drive rodless lifting mode is applied, which successfully prevents the wear of the sucker and tube and avoids the unproductive energy consumption that is caused by the movement of sucker rod string when oil pumping units, screw pumps and other rod lifting methods are adopted. Compared to the oil pumping unit with the same displacement, the application of the reciprocating direct-drive electric submersible plunger pump can reduce electric power consumption by more than 40%. Moreover, this new-style reciprocating direct-drive electric submersible plunger pump has no surface movable component, and the well head is sealed. Therefore, it is safe, environmental friendly and easy to maintain.