METHOD OF LOW-PERMEABLE OIL DEPOSIT DEVELOPMENT Russian patent published in 2014 - IPC E21B43/26 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method includes opening of the oil deposit by a vertical well, construction of a horizontal offshoot, multiple hydraulic fracturing of the stratum, product withdrawal and injection of the working fluid by equipment designed for dual production and injection. According to the invention the deposit is identified with permeability of less than 2 mD, hydraulic fracturing is made in the main hole with obtainment of fracture in the vertical plane. Then a side horizontal offshoot is made in direction of maximum oil-filled thickness with running in of production casing up to the distance C within the range of 100 m and 300 m from the hydraulic fracturing plane of the main hole, the remaining part of the side horizontal offshoot behind the distance C is made open, cased or with run in screened liner. The angle between the plane of hydraulic fracturing and direction of the side horizontal offshoot shall be equal to 45-90°, multiple hydraulic fracturing is made in the side horizontal offshoot with distance between stages of at least 10 m and 100 m at the most. The first stage of the multiple hydraulic fracturing is made at the distance C starting from the end part of the side horizontal offshoot, the main vertical hole is used for injection of the working fluid to the deposit while side horizontal offshoot is used for product withdrawal by equipment designed for dual production and injection.

EFFECT: increase in oil recovery factor.

1 dwg