DEVELOPMENT METHOD OF MULTIPLE-ZONE OIL DEPOSIT Russian patent published in 2015 - IPC E21B43/20 E21B43/38 

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering of a pipe string with a filter below a well liquid level, extraction of the production from the well, separation of oil and water in the well shaft, water pumping to another formation, and lifting of oil to the surface. A filter represents an annular tube; an internal tube has a hydrophobic surface with a degree of hydrophobic properties of at least 99%, with capillary holes with a diameter of not more than 2 mm and density of at least 50 holes per metre. The lower part of the internal tube allows no water passage. The external tube has a hydrophilic surface with a degree of hydrophilic properties of at least 99%, with capillary holes with a diameter of not more than 2 mm and density of at least 50 holes per metre. In the lower part of the filter there installed is a packer between a casing string and the external tube for sealing of this space, and between the external and internal tubes of the filter there left in the lower part is space for liquid passage. Liquid penetrates into the space between the internal and the external tubes of the filter, where it is filtered through the capillary holes, thus being separated into oil and water.

EFFECT: improving efficient separation of oil and water in a well shaft; improving efficiency of water flooding and increasing oil recovery of a deposit.

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