WELL SUCKER-ROD PUMP FOR EXTRACTING LIQUID AND GAS Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: device has surface and underground equipment. Underground equipment includes cover, cylinder with suck-in valve, where a plunger is mounted with possible opening at the end of ascending drive of cylinder aperture and longitudinal channel of varying cross-section for connecting sub-plunger hollow of cylinder to inner hollow of tubing pipes an throttling separated liquid. Plunger is connected to pump rods by means of auto-clamp, catcher rod, filter and hollow rod let through an inner filter. It is mounted in the pipe with a stop against cylinder, and during raising of pump rods - with stop against plunger. Inner filter in lower portion has outer projection for preventing foreign particles and objects from getting into area of placement of suck-in and force valves. Cylinder in upper portion is equipped with radial apertures. Below them at certain distance throttling aperture is placed. It is connected to inner ring recess. It is meant for unloading plunger at the end of its ascending drive from liquid pressure force acting through throttling aperture. Its through cross-section is selected by calculating or experimenting in such a way, that hydraulic hits where absent during operation and in sub-plunger hollow of cylinder during plunger movement above throttling aperture necessary amount of separated fluid was supplied for receiving maximum fill coefficient in each draining cycle. Cylinder in lower portion is connected to lower sleeve by means of body of suck-in pump, which sleeve is connected to outside filter with plug and to cover. Cover is connected to upper sleeve by its upper end and to pipe by centering sleeve, where an inner shelf is present which is meant for preventing transversal displacements and centering cylinder in cover during operation and preventing foreign particles and objects from getting from inner hollow of tubing pipes into area of placement of force and suck-in valves.

EFFECT: higher liquid and gas yield, higher reliability of operation, unified assemblies and parts, shorter time needed for underground maintenance in wells equipped with sucker-rod pump for extracting liquid and gas.

4 cl, 9 dwg