METHOD FOR DEVELOPMENT OF OIL DEPOSITS BY HYDRAULIC FRACTURING FRACTURES Russian patent published in 2017 - IPC E21B43/267 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling wells with a horizontal wellbore in an oil deposit, carrying out the hydraulic fracturing in the horizontal wellbore with the formation of hydraulic fracturing fractures that connect the oil and the gas deposits separated by an impenetrable interlayer, and extracting oil from the oil deposit. In the center of the oil deposit, with its opening, a vertical wellbore is drilled, then from the vertical wellbore in the direction parallel to the minimum main stress σ_min of the rocks forming the oil deposit, the first horizontal wellbore is drilled, hydraulic fracturing at the bottom of the first horizontal wellbore is carried out to form a fracture, wherein a hydraulic fracturing fluid with a weighted proppant is pumped to form the hydraulic fracturing fracture. After the fracturing fracture from the oil deposit through the impermeable interlayer is formed, the fracture is sealed with the proppant, then the hydraulic fracturing interval in the first horizontal wellbore is isolated from the side of the vertical wellbore, after which the first horizontal wellbore is perforated, then the temporary horizontal insulation is installed at the entrance to the first horizontal wellbore, then the second horizontal wellbore is drilled from the vertical wellbore at an angle of 180° with respect to the first horizontal wellbore and in the direction parallel to the minimum main stress σ_min of the rocks forming the oil deposit, and technological operations similar to those in the first horizontal wellbore are carried out, after which the temporary insulation installed at the entrance to the first horizontal wellbore is removed, the well pump is lowered into the vertical wellbore and put into operation; while reducing the pressure in the oil deposit twice, one vertical well is drilled at a distance of 50 m from each bottomhole of the first and the second horizontal wellbores, the oil deposit is opened and an artificial front of oil displacement along the first and the second horizontal wellbores is created by water injection, and the oil residues are collected from the oil deposit.

EFFECT: increasing the method implementation effectiveness.

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