METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL DEPOSIT USING PAIRED HORIZONTAL WELLS Russian patent published in 2020 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil-producing industry. Method for development of high-viscosity oil deposit using paired horizontal wells includes construction in productive formation of horizontal loading well and production well located below and parallel to injection well, lowering to injection well two tubing strings of tubing string of different diameter with arrangement of ends in different intervals of horizontal shaft, lowering into production well of one or two tubing strings with displacement of end or ends along horizontal relative to ends of tubing string of injection well by not less than 10 m, initial heating of productive formation by pumping of deposit required for warming up between wells with creation of hydrodynamic connection of superheated steam volume, maintenance for thermocapillary impregnation and wellbore cooling, performance of thermobarometric measurements, placing a fibre-optic cable in the production well and a tubing string with a deep-well pump and inlet temperature sensors, continuing pumping through the injection well of steam to the injection well and extracting the product with a deep-well pump from the production well. Before launching for steam pumping, the ends of the tubing string in both wells are equipped with temperature and pressure sensors, steam injection into both wells is performed together with thermo-baric analysis, when the corresponding well of cut-off pressure is reached at both ends of the tubing - pressure of vaporization of superheated steam at the specified temperature from the injection well through the mouth steam-gas mixture is released to reduce pressure by 5–10 %. Control of hydrodynamic connection with production well is carried out by monitoring beginning of temperature and pressure rise due to steam injection into production well. Pumping is continued to production well with periodic bleeding of pressure by 5–10 % upon reaching cut-off pressure until obtaining thermohydrodynamic connection between wells.

EFFECT: technical result is possibility of steam injection at medium and low reservoir capacity, reduction of energy consumption during heat carrier pumping.

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