PROCESS OF FLUID LIFTING FROM WELL Russian patent published in 2004 - IPC

FIELD: oil production, extraction of oil carrying great amount of sand in stratal fluid and large curvature of well.

SUBSTANCE: process includes expulsion of fluid from cylinder of well pump by means of plunger making reciprocating motions in cylinder under action of energy of power plant put on wellhead. In correspondence with invention plunger is made of heavy fluid in which capacity zinc bromide-calcium bromide are used. Suction valve of well pump is linked to shank fitted with packer. This packer separates well fluid from heavy fluid. Translational motions of plunger are carried out by means of light fluid periodically injected by power pump into tubular annulus Backward motion of plunger is carried out thanks to difference in densities of heavy and light fluid and pressure at intake of well pump.

EFFECT: enhanced functional reliability of well pump under conditions of recovery of sand and other mechanical impurities, prolonged overhaul period, automatic pumping-out of fluid from well.

3 cl, 1 dwg