HYDRAULIC ROD DRIVE OF A SUBMERSIBLE POSITIVE DISPLACEMENT PUMP (EMBODIMENTS) Russian patent published in 2023 - IPC F04B47/04 

FIELD: oil industry.

SUBSTANCE: group of inventions can be used extract oil from wells. The hydraulic rod drive of the submersible positive displacement pump comprises a lift string 9 located in at least one well with a reciprocating submersible plunger pump, a drive chamber 5 with a movable differential plunger with sealed steps, having a hydraulic connection through a drive hydraulic channel filled with a drive fluid, with wellhead drive pumping unit. Embodiments with submersible plunger and diaphragm pumps are proposed. The hydraulic drive is connected to the wellhead drive pumping unit using a hydraulic channel, the stages of the differential plunger and the drive fluid are isolated from the pumped aggressive fluid by elastic diaphragms 44 of the sail type. The drive operates by increasing/decreasing the pressure in the chamber 5 through the wellhead drive pumping unit. The transfer of kinetic energy between the drive and pumped fluids occurs through diaphragms 44. The unit can operate with several wells at the same time.

EFFECT: improving the reliability of operation, reducing energy costs and metal consumption.

4 cl, 5 dwg