METHOD OF DEVELOPMENT OF 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 below fluid level of the pipes string with pumps, and with filters installed at pipe ends, product recovery from top production deposit, oil and water separation in the wellbore, water injection to the bottom deposit, oil lifting to surface. Two filters are run to well on separated pipe strings. Filters are pipes with capillary holes with diameter 2 mm max, and density 50 holes/m min. One filter has hydrophobic surface with hydrophobic degree 99% min, the another filter has hydrophilic surface with hydrophilic degree 99% min. Parker is installed above the top deposit to seal the annulus. Filters are made with length not below the bottom deposit roof. Filter with hydrophilic surface is made with large length then the filter with hydrophobic surface such that the parker installed between the production string and filter with hydrophilic surface will be above the bottom deposit roof, and end of the filter with hydrophobic surface will be above this parker. The parker does not permit the fluid from the top deposit flow to the bottom deposit via the annulus. Moving from the top production deposit to the wellbore the fluid enters the annulus, where it is filtered via the capillary holes of the appropriate filters with hydrophobic and hydrophilic coatings separating to oil, that entering via the filter with hydrophobic surface in the pipes string by the pump is lifted to surface, and to water that entering via the filter with hydrophilic surface in the another pipes string 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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