DEVELOPMENT METHOD OF HIGH-VISCOSITY OIL AND BITUMEN DEPOSIT Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: in the development method of high-viscosity oil and bitumen deposit, which involves drilling of injection and production wells, heat carrier pumping through injection wells and extraction of the product through production wells, one pair of inclined production wells of similar length is drilled in parallel vertical planes with the distance of not less than 10 m between them and at an angle of 30-35° to the formation bottom towards each other. Then, three vertical injection wells are drilled symmetrically between them; at that, one of them is arranged in the middle of length of inclined production wells projected to a horizontal surface, and two others are arranged at equal distance to the right and to the left of it. Pumping of heat carrier to vertical injection wells is alternated with pumping of a hydrocarbon solvent. Heat carrier pumping cycle is performed till oil and bitumen viscosity in the productive formation is decreased to the value providing dilution of oil and bitumen in a chamber-solvent at further pumping of a hydrocarbon solvent, which is continued till maximum viscosity value of oil and bitumen, which provides dilution of oil and bitumen with the hydrocarbon solvent, is achieved; after that, pumping of hydrocarbon solvent to vertical injection wells are stopped and pumping of heat carrier is renewed to them. Oil and bitumen extraction from inclined production wells is performed constantly.

EFFECT: increasing displacement coefficient of high-viscosity oil and bitumen, and increasing the coverage of the formation with heat action both horizontally and vertically.

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