METHOD OF DEVELOPMENT OF MULTIRESERVOIR OIL DEPOSITS Russian patent published in 2015 - IPC E21B43/20 E21B43/02 

FIELD: oil and gas industry.

SUBSTANCE: method comprises run in the production well of the pipes string with filter below liquid level in well, product recovery from top deposit, oil and water separation in the wellbore, water injection to bottom deposit, oil lifting to surface. The filter is pipe in pipe, the internal pipe has hydrophilic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm min, and density 50 holes/m min. Outside pipe has hydrophobic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm max, and density 50 holes/m min. Pipes string diameter used for filter run is equal to diameter on internal filter pipe. Internal pipe has length exceeding length of outside pipe. Outside pipe is located not below the top deposit, and internal pipe - not below bottom deposit. Between the casing string and bottom of the outside pipe above the top deposit the parker is installed, ensuring fluid from top deposit ingress directly in space between the internal and outside pipes of the filter. Between the casing string and bottom of the internal pipe above the bottom deposit the parker is installed also, excluding fluid from bottom deposit ingress in space between the internal and outside pipes of the filter. Moving from top production deposit to the wellbore the fluid enters the space between the internal and outside pipes of the filter, where it is filtered via the capillary holes of the appropriate filter pipes with hydrophobic and hydrophilic coatings, separating to oil that entering in the outside pipe and then in annulus by the pump is lifted to surface, and to water that entering in the internal pipe by the pump is pumped in the bottom deposit.

EFFECT: increased efficiency of oil and water separation in the wellbore, increased efficiency of waterflooding and increased oil recovery of the deposit.

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