HIGH-VISCOSITY OIL OR BITUMEN RECOVERY METHOD, USING HYDRAULIC FRACTURES Russian patent published in 2017 - IPC E21B43/24 E21B43/267 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: high viscosity oil or bitumen recovery method, using the hydraulic fractures involves the drilling of the injection horizontal well over the producing horizontal well towards it in the deposit, represented by the upper and lower parts of the productive reservoir, separated by the fluid-proof collector, fixing by the producing and injection wells casing strings, the casing strings perforation, the coolant injection through the horizontal injection well, the selection of heated products through the producing horizontal well. The injection horizontal well is drilled in the upper part of the productive reservoir in the direction of the main minimum stress σ_min, perforate the casing string of the injection horizontal well at the bottom, provide the heating of the perforation interval and perform the hydraulic fracture from it with creation of the first crack, that opens the fluid-proof collector from the top to bottom. To create the first fracture, the fracture fluid is injected with the lightweight proppant at the concentration, providing the development of the first fracture down, the first crack is fixed by pumping the carrier fluid with the proppant, create the hydrodynamic connection between the upper and the lower parts of the productive formation, then the length of the first crack is determined by the geophysical methods. After that at the distance of 3-5 m below the first fracture parallel to the horizontal injection well in the lower part of the productive reservoir, the producing horizontal well is drilled, the casing string of the producing horizontal well is perforated at the bottom, the perforation interval is heated and the fracture is produced from it, creating the second fracture, that opens the fluid-proof collector from the bottom up. To create the second fracture, inject the hydraulic fracturing fluid with the weighted proppant at the concentration, that provides the development of the second fracture up, provide the second fracture fixation by pumping the carrier fluid with proppant and create the hydrodynamic connection between the lower and the upper parts of the productive reservoir, equip the wells with operating equipment. The coolant is injected through the injection horizontal well through the first fracture into the deposit, and the selection of high-viscosity oil or bitumen from the deposit is made through the second fracture along the producing horizontal well.

EFFECT: increase of the recovery method efficiency and reliability, increase of the deposit coverage by the heat effect, the uniform and complete recovery of high-viscosity oil or bitumen stocks from the deposit, with simultaneous costs reduction.

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