METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL RESERVES Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: The invention relates to method for development of high-viscosity oil reserves. The method for development of high-viscosity oil reserves includes: drilling of the main well bore, from which upper and lower side horizontal bores are drilled: installation of a lower packer into the main bore below sidetracking of the upper side horizontal bore; descent of outer and inner tubing into the main well bore; installation of upper packer between the outer piping and the main bore above the sidetracking of upper side bore; injecting the heat carrier into the tube space of the piping and extraction of product by pump through inner piping. The side bore are multi-bores with parallel horizontal branches. The heat carrier is injected into the upper side horizontal bore through the space between the packers, and the extraction is carried out through the lower side horizontal bore from the spae between the packers. If the product is watered to 90-95%, the heat carrier injection and product extraction are stopped; after the pump is retrieved a colmatage hydrophilic composition is injected into the below-packer zone, after a process delay and descent of the pump the extraction of the product and injection of the heat carrier is resumed.

EFFECT: expanded area of heat action on the high-viscosity oil formation, increased oil production of the formation, simplifying the technology with the possibility to reduce watering of the extracted product by isolating water-flooded sections of the horizontal output well.

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