METHOD FOR DEVELOPMENT OF DEPOSITS OF HIGH-VISCOSITY OIL OR BITUMEN Russian patent published in 2021 - IPC E21B43/24 E21B7/04 E21B47/06 E21B33/138 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry. The method for developing a reservoir of high-viscosity oil or bitumen includes the construction of pairs of horizontal production and injection wells located one above the other, equipped in the horizontal part with liner filters, heating the reservoir by injection of steam into both wells with the creation of a steam chamber, subsequent injection of steam through injection wells, product selection for account of steam-gravity drainage through production wells and control of the state of the steam chamber. After depletion of a section of a deposit in one of the pairs of wells, steam injection and liquid withdrawal are stopped. After the temperature in the production well has dropped below 80°С, new boreholes are built from the production and injection wells with a horizontal section equipped with a liner filter in the direction of the areas of the reservoir not covered by development. At the same time, the wellbore is isolated, located below the exit level of the additional wellbore, under which a whipstock is installed in the well for cutting out a window and building a new wellbore. New wellbore exits are positioned above the corresponding horizontal sections of the new wellbores to provide descending sections between the wells and new horizontal sections. From an injection well, a new borehole is constructed with a horizontal section above a new horizontal section of a production well at a distance that provides a hydrodynamic connection between the boreholes after warming up, but excludes steam breakthrough. Steam is injected into both wells to obtain a hydrodynamic connection between the new wellbores. Then steam is injected through a new borehole of the injection well and the product is taken out through the new borehole of the production well with control of the state of the steam chamber.

EFFECT: recovery of residual oil reserves, facilitation of liner and downhole equipment commissioning, elimination of emergencies associated with the extraction of liner filters.

1 cl, 2 dwg, 1 ex