FIELD: oil-and-gas production.
SUBSTANCE: device includes lift string of pipes and plunger pump, implemented with ability of hydraulic communication of over-plunger and under-plunger parts. Pump casing on inner surface is outfitted by rows of vertical slots of length Lo with distance between to edges of underlying and bottom edges of overlying rows of slots Lp. Plunger on outside surface at a distance Lt from bottom butt is outfitted by annular chamfers with openings inside the plunger. Additionally Lp≥2Lo, Lt≤0,5Lo, and plunger's length of stroke Lx=(8-10)(Lo+Lp). Device is outfitted by tail, located lower the pump.
EFFECT: increasing efficiency of dilatative-wave action in well.
1 dwg
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