METHOD FOR OIL FORMATION DEVELOPMENT Russian patent published in 2017 - IPC E21B43/24 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method involves descending into the tubing casing with a packer separating the upper and lower zones of one formation, perforating the above mentioned zones. Then, a substance that reduces viscosity of oil is injected into the upper zone of the formation along the annular space between the casing and the tubing and a mixture of oil and a substance that reduces viscosity of oil is withdrawn through the tubing string. According to the invention, the perforation of the upper zone is carried out at a distance of 0.5-1m below the formation, cap and perforating the lower zone at a distance of 0.5-1m above the formation bottom. At that before the separation of the upper and lower zones in each of them horizontal cavities are formed by creating hydraulic fractures of the formation.

EFFECT: increasing efficiency of oil formation development containing high viscosity oil by increasing the coverage of the formation while simplifying the method.

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