PLUNGER UNIT WITH LINEAR MOTOR (VARIANTS) Russian patent published in 2023 - IPC F04B47/06 F04B17/04 E21B43/00 

FIELD: oil production.

SUBSTANCE: group of inventions includes two versions of the device. In the first version, the device contains linear submersible electric motor 2 and plunger pump 1. Electric motor 2 includes, connected in series, upper head 7 of stator 5 with current lead block 11, through which electric motor 2 is connected to the power supply source, and stator 5, consisting of magnetic circuits with coils 12, located in the oil-filled housing of stator 5 containing head 6 in the unpressurized internal space. Stator 5 and head 6 form a friction joint. Through head 7, electric motor 2 is connected to the lower end of housing 17 of pump 1. Head 6, through upper tip 14, is connected to rod 8 of movable cylinder 10 of pump 1. Plunger 18 of pump 1 is fixed at the upper part of pump 1 housing, where holes A are provided for entry of the well fluid. Holes B are provided at the bottom of rod 8 to enable entry of the well fluid into cylinder 10. Suction valve pairs 19 are installed between rod 8 and cylinder 10. At the lowest point of housing 17, sand-separating sleeve 21 is installed.

EFFECT: improved filling of the pump cylinder of the device with simultaneous separation of associated gas and solids.

7 cl, 2 dwg