OIL-WELL SUCKER-ROD PUMP Russian patent published in 2005 - IPC

FIELD: oil-and-gas producing industry.

SUBSTANCE: proposed pump contains piston unit, housing, central rod with bead and sucker-rod string. Delivery valve is made in form of spool pair consisting of spool, barrel and centralizer. Upper part of spool is arranged in barrel, and lower part, in centralizer on lower end of piston unit. Mechanical linkage of spool and sucker-rod string is provided by central rod with stop capable of withstanding load at contact with adapter stationary secured on upper end of piston unit.

EFFECT: improved reliability and increased service life of oil-well sucker-rod pump owing to reduction of load on delivery valve, increased pump fill factor, reduced resistance to pumped liquid flow inside piston unit.

2 dwg