METHOD OF RECOVERY OF FLUID AND GAS FROM WELL AND SUCKER-ROD PUMPING UNIT FOR METHOD EMBODIMENT Russian patent published in 2002 - IPC

FIELD: oil producing industry; applicable in operation of wells with high gas factor and of well operated at dynamic heads at sucker-rod pump suction. SUBSTANCE: method provides that at end of plunger upward motion, fluid from tubing string starts entering the cylinder internal cavity. In course of oil recovery, from beginning of plunger upward motion, free gas accumulating on well annulus is introduced into cylinder internal cavity for its pumping-out together with gas-fluid mixture. At end of plunger upward motion, in order to enhance coefficient of unit admission and provision of pumping of free gas, separated fluid is introduced from annulus under effect of pressure of fluid column in tubing into cylinder internal cavity. This fluid is directed to this space over tubing walls from ascending fluid flow under gravity. In this case, separated fluid is throttled for additional separation of gas from fluid and for gradual increase of pressure in cylinder internal cavity. Device consists of cylinder with suction valve, plunger with pressure valve and case. It is provided with filter having radial holes and longitudinal channels and connected cylinder having longitudinal conical channel. Plunger is installed for opening at end of its upward motion, of cylinder radial hole and longitudinal conical channel for communication of cylinder internal cavity with internal cavity of tubing and throttling of separated fluid. Plunger has upper valve cage accommodating safety valve, seat, pusher and spring. Case upper end is connected by means of coupling to tubing, and its lower end is connected by means of subs to cylinder and external filter having plug. End connected with external filter is also connected with valve cage where suction valve and seat are located. EFFECT: increased oil recovery and time between overhauls of producing wells. 2 cl, 3 dwg