RECOVERY METHOD OF HIGH-VISCOSITY OIL OR BITUMEN DEPOSIT, USING HYDRAULIC FRACTURES Russian patent published in 2017 - IPC E21B43/247 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: in the recovery method of the high-viscosity oil or bitumen deposit, using the hydraulic fractures HFT in the deposit at the distance of 100 m from one another the injection vertical wells are subsequently drilled in the line with the impermeable interlayer breaking, after drilling each vertical injection well is fastened by the casing string and perforated in the upper and lower parts of the productive reservoir and impermeable interlayer, provide the HFT in the impermeable interlayer interval, forming and fastening the fracture. Perform the geophysical studies and determine the direction of the fracture development along the azimuth, its height and half-lengths, at that the vertical injection wells are drilled on the straight line perpendicular to the fracture cracks development direction, made from the first and subsequent vertical injection wells. Then at the distance of 5 m above the impermeable interlayer above the cracks perpendicular to the fracture cracks direction, two horizontal injection wells are drilled at both ends, under the horizontal injection wells at the distance 5 m below the impermeable interlayer two horizontal productive wells are drilled. The coolant injection into the deposit is provided through the horizontal and vertical injection wells, and the selection from the deposit is carried out from the productive horizontal wells. After the production decline from the productive horizontal wells by 50% from the injection horizontal wells between the injection vertical wells perform the interval HFT with the impermeable interlayer breaking forming and fixing the fracture cracks, using the lightweight proppant, then the coolant is injected into the deposit through the injection horizontal wells, the selection from deposit are carried out from productive horizontal wells.

EFFECT: method efficiency increase, the uniform and complete the high-viscosity oil or bitumen reserves recovery from the deposit, increasing the deposit coverage by thermal impact with the operating costs reduction.

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