METHOD OF OPERATION OF PAIR OF WELLS PRODUCING HIGH-VISCOSITY OIL, WITH INJECTION STOP Russian patent published in 2020 - IPC E21B43/24 E21B7/04 E21B47/06 E21B49/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil-producing industry. Method of wells operation for extraction of high-viscosity oil with pumping stop includes construction of horizontal injection well and horizontal production well located below and parallel to injection well, carrying out in the horizontal borehole of the geophysical investigations to determine oil saturation along the horizontal borehole, placement in the injection well of two tubing strings - the tubing string with placement of the end of the column of smaller diameter - at the beginning of the horizontal shaft, and end of column of larger diameter - in zone with oil saturation of more than 60 %, placement in production well of fiber-optic cable and tubing string with pump and temperature sensors at inlet of pump motor and pump, controlled injection of steam into injection well through tubing string of various diameters, conducting thermobaric measurements in production well and by means of these investigations detection in the horizontal shaft of the production well of the transition zone with temperature between larger and smaller heating, determination in the detected zone of the interval with change of the angle of set of curvature of not more than 2 degrees per 10 m, arrangement of pump in this zone, change of steam supply through injection well and operation of pump set mode of operation of a pair of wells, achieving constant mode of pump with flow rate required to maintain temperature of liquid at intake of pump close, but not more than maximum permissible temperature of liquid at pump intake. Prior to construction of injection and production wells geological and exploration wells are drilled, then deposit is tested through them. In production of oil inflow, its physical and chemical analysis is performed to determine oil viscosity in reservoir conditions. When the limit temperature of the liquid is reached or exceeded at the pump intake, pumping of steam into the injection well is stopped, and the production well is continued. At that, temperature changes at the pump of the producer are constantly monitored; steam is pumped to the injection well at low temperature: for oil viscosity of more than 40,001 mPa*s - up to 80 %, for oil viscosity of 30,001–40,000 mPa*s - up to 75 %, for oil viscosity of 22,001–30,000 mPa*s - up to 70 %, for oil viscosity of 15,000–22,000 mPa*s - up to 65 %, for oil viscosity less than 15,000 mPa*s - up to 60 %.

EFFECT: technical result is reduction of energy and operational costs for preparation and pumping of heat carrier into injection well, prevention of blowouts and failures in pump operation due to pump maintenance in working temperature zone.

1 cl, 1 tbl, 1 ex, 1 dwg