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

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production, in particular, to rod-type deep-hole pumping units for extraction of formation fluids. Plant comprises plunger pump 1 with plunger 2, suction valve 29, delivery valve 30 and submersible linear motor (LM) 15, including cylindrical housing 14, inside which there is stator 19 with steel cores 12 periodically installed on thin-wall bushings 20 and interconnected by induction coils (IC) 13. Head of reciprocating action – slider 18 consists of shaft 21, made with possibility of connection with plunger 2 through extension 35. LM includes current lead head (CLH) 5 with through channel 4 and tight connector 31 connecting ends of phase windings 11 with coupling cable input supply cable. IC 13 and magnetically conductive steel cores 28 are limited by end covers 16 in modules 17 and are rigidly connected to each other along the whole length of stator by steel branch pipes 25 with support bushings 26. To form sliding surfaces of slider between stator 19 LM and CLH 5 there is extension pipe 8 made of two coaxially arranged bushings 9 to form a central annular cavity 10 for free slider outage during upward movement and formation of annular cable cavity 7 between bushes 9 for cable 6 from CLH 5 to connection with ends of phase windings of stator 11. Below stator 19 LM 15 shank 22 is installed. At end of shank end there is damping spring 23 and end plug 24, which can be perforated 39 or non-perforated. Shank 22 in lower part with perforated section is equipped with through holes 37.

EFFECT: improving reliability at simultaneous maintenance of the repairability of the installation and improvement of its manufacturability.

1 cl, 4 dwg