METHOD OF ULTRAVISCOUS OIL DEPOSIT DEVELOPMENT Russian patent published in 2025 - IPC E21B43/24 

FIELD: mining.

SUBSTANCE: invention relates to the oil industry, in particular to the development of deposits of high-viscosity oil or bitumens with thermal action of horizontal wells. Method of development of ultraviscous oil deposit involves drilling of rows of wells with boreholes parallel in horizontal plane and drilled towards each other in staggered order, pumping of heat carrier and oil production. Wells in rows are drilled in pairs consisting of horizontal production well and horizontal injection well located above and parallel to production well. Rows of paired wells drilled towards each other are drilled at distance of 50-70 m along horizontal plane. All horizontal well shafts are cased with a tail filter with pre-installed plugs. Plugs are then removed from heel to 1/2 of the length of the well and a drillable packer is installed in the middle part of the wells. After that, initial heating of all drilled producing and injection wells is performed by pumping of heat carrier – steam in volume of 60 t/day during 40 days. After heating all wells are stopped for thermocapillary impregnation for 20 days. Then steam pumping to injection wells with volume of 60 t/day is resumed. Production wells are started for extraction of liquid with flow rate of 70 t/day; using fibre optic cable there performed are temperature measurements along the whole length of production wells to the place of packer installation. When heating in one of production wells reaches temperature 90 °C and higher this production well and injection well corresponding to it are stopped. Packer is drilled in them and plugs are cut to the well bottomhole. Then steam pumping to the injection well with volume of 100 t/day and higher and fluid extraction from the production well is resumed. Implementation of the proposed method allows to reduce the costs for initial heating and the creation of hydrodynamic communication between production and injection wells, to increase rate of deposit development, to increase volume of produced oil due to involvement in development of interwell zone, and accordingly to increase economic efficiency of deposit development of superviscous oil.

EFFECT: improving efficiency of the method for development of ultraviscous oil deposit by reducing the volume of pumped steam at the stage of well development and increasing the rate of reserves development due to accelerating the formation of hydrodynamic communication along the whole shaft between producing and injection wells.

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