In the plunger pump unit with a hybrid drive, the ESP operation is converted into a reciprocating movement of the working body of the plunger pump (PP). A special hydraulic pump consisting of an ESP and a hybrid drive (HD) is driven by a submersible electric motor (SEM). The ESP drive fluid is pumped in a closed loop inside the hydraulic pump.
During such operation, HD plunger movement in the cylinder of the hybrid drive is realized, as well as the rigidly connected PP plunger moves relating to the cylinder of the PP.