METHOD FOR DEVELOPING LOW-PERMEABLE DEPOSIT Russian patent published in 2017 - IPC E21B43/30 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: development of oil deposits is carried out by a system of obliquely directed injecting and producing wells with the injection well with hydraulic fracturing in the center and the producing ones with hydraulic fracturing around. In the producing and injecting wells, hydraulic fracturing is immediately performed after drilling and the wells are put into operation. The initial direction of the maximum horizontal stress of the deposit is determined. In the drilled zones, the well net is compacted by placing the wellbores of producing horizontal wells in the direction of the initial maximum horizontal stresses of the deposit. The middle of the horizontal wellbore length is arranged in the same row with the obliquely directed wells. All producing obliquely directed wells arranged opposite the middle of the horizontal wellbore length are transferred to the discharge. Fluid injection in all obliquely directed wells placed opposite the middle of the horizontal wellbore length is carried out at the bottomhole pressure exceeding the formation fracturing pressure. Multistage hydraulic fracturing in horizontal wells for defining the fractures direction of hydraulic fracturing perpendicular to the direction of horizontal wellbores is carried out at the stage when the adjacent obliquely directed wells of the existing development system placed opposite the middle of the horizontal wellbore length of the producing wells are already put into injection. The estimation of the required time for carrying out multi-stage hydraulic fracturing in horizontal wells from the moment of putting the adjacent obliquely directed wells into injection is carried out based on calculations of the stress-strain deposit state in the geomechanical simulator. After carrying out the multi-stage hydraulic fracturing, horizontal wells are put into operation.

EFFECT: increased profitability of the development of drilled low-permeability deposits.

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