SUBMERSIBLE RODLESS PUMP UNIT Russian patent published in 2019 - IPC F04B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to design of rodless subsurface pump-borehole installations for extraction of formation fluids in oil production. Proposed plant comprises submersible plunger pump 25 composed of case 26, plunger 27, suction 28 and discharge valve 29 and rod 20. Submersible linear electric motor (LEM) 1 installing under the pump is connected to pump 25 through the current lead head 13. LEM 1. It includes housing 2, inside which there is stator 3 with modules (M) 5 installed on thin-wall bushes 4, consisting of cores 6 and induction coils (IC) 7. Each M 5 is limited by end covers (EC) 8. Center bearings 9 are mounted between M 5. Distances between EC 8 of adjacent M 5 are made over the whole length of stator and equal to each other and strictly multiple to length of polar pitch 22 of stator. Stator polar pitches lengths are equal to width of three IC 7 with three adjacent cores 6 made equal to lengths of po polar pitches 23 of the slider, measured by width of permanent magnet 11 with two adjoining magnetically conductive cores 12. Inside stator 3 there arranged is slider 21 consisting of shaft 10 with permanent magnets 11 and magnetically conductive cores 12 installed on it. Shaft 10 is connected with rod 20. In the lower part of housing 2 LEM pressure compensator 17 is installed, the oil-filled cavity of which is hydraulically connected to the cavity of stator 3. Submersible plant is lowered into well on tubing and connected to ground equipment by power cable.

EFFECT: higher tractive effort and reliability, while maintaining repairability.

1 cl, 2 dwg