FIELD: oil and gas industry.
SUBSTANCE: injection well contains a casing with an arranged inside tubing string with packers located above oil bearing formations, and couplings of a crosswise flow, their radial channels connect the central channels with the oil bearing formations disconnected by the packers. Above the last tubing strings movable disconnecting couplings are tightly connected with a possibility of alternate packers seating in the casing. The longitudinal channels connect the tubing cavities above and below the couplings, that in the bottom coupling are locked by a plug. In the central channels of the couplings remote mechanical system units are tightly installed to regulate the flow and to meter the flow rate of the injected working medium; they contain a regulating valve with a motor drive of program control and a flowing seat, remote metering transducers and a flow meter, located in sleeves above the couplings, connected with each other and with the control device at the control station, containing a time relay and a control controller with software, a logging cable passed through a lubricator installed on the tubing string, with a possibility of control commands and control information transmission with signals separation. The remote mechanical system units are made with a possibility of their serial seating from the wellhead in sockets of the appropriate couplings bottom-upwards with increasing the diameters of the seats in the couplings. The logging cables between the remote mechanical system units are located in telescopic pipes equipped with compression springs. The tubing string has shutdown-bypass valves and wellhead pump-ejector unit containing a power pump with a frequency regulated motor drive, connected by an input with a water line from a water source with a shutdown valve, a gas/liquid ejector-mixer, connected by inputs with a gas line from a gas source with a regulated gate and check valve, tanks with a surface active substance by a pipeline with a regulated gate and check valve, and by a water line with the power pump discharge. The discharge of the ejector-mixer is connected with the tubing string via a pipeline, with an integral booster pump and hydraulic gate. To the water supply lines to the ejector-mixer and its output the water return bypass is connected via a safety valve. The control system is connected by power cables with motor drives of the power and booster pumps.
EFFECT: increased efficiency of oil displacement from formations.
6 cl, 1 dwg
