FIELD: engines and pumps.
SUBSTANCE: invention is related to pump sets and may be used for production of oil, water and other liquids from wells. Pump cylinder with membrane-valve system is fixed with the help of packer to casing string. Stem of plunger is arranged in the form of pipe with filler, upper end of which is fixed to wellhead. Reciprocal motions of plunger are executed due to longitudinal elastic deformation of stem, which is caused by cyclic variation of filler pressure with frequency equal to 0.33÷1.0 of own frequency of oscillating system.
EFFECT: expansion of operational range, simplified design, increased reliability and efficiency of plunger pump sets.
6 dwg
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