HIGHLY VISCOUS OIL OR BITUMEN DEPOSIT DEVELOPMENT METHOD Russian patent published in 2019 - IPC E21B43/24 E21B7/04 E21B47/02 E21B47/06 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil-producing industry. In the high-viscosity oil or bitumen deposits development method building the productive formation roof map and the effective oil-saturated thicknesses map, selecting a deposit plot with the productive formation thickness of more than 6.5 m. Drilling the horizontal and/or directional production wells grid. After horizontal and/or horizontal-horizontal production wells investigation determining, where is the hypsometric marks falling takes place perpendicular to the axis at the horizontal and/or inclined-horizontal production well bottom. Locating the vertical injection well on the productive formation falling roof side at the bottom of horizontal or inclined-horizontal production well with offset from the horizontal shaft axis down the structure at a distance of 5 to 20 m. Creating the vertical injection well communication with the productive formation with the opening total interval of not less than half of the productive formation thickness, located vertically at a distance of not more than 6 m from the production well bottom. Steam into the vertical injection well is injected with injection modes, precluding a breakthrough into the nearby production well due to the temperature control therein. In the initial period, into the production and injection wells performing the steam injection to develop a hydrodynamic connection between the wells and their bottom zones warming, after the bottomhole zones are heated up, the horizontal and/or horizontal-horizontal wells are transferred for production, and the vertical ones are for injection.

EFFECT: technical result is increase in the steam and gravity drainage technology into deposits with the productive formation roof slope efficiency, elimination of the heat carrier breakthrough into the production well, increase in the steam-thermal effect coverage, reduction of the steam up the structure exit negative effects and the thermo-hydrodynamic communication achievement acceleration.

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