HYDRAULIC FRACTURING METHOD WITH THREE-ROW ARRANGEMENT OF WELLS Russian patent published in 2023 - IPC E21B43/26 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in hydraulic fracturing, in particular with in-line development systems. The method for hydraulic fracturing of wells with production and injection wells includes lowering a pipe string with a packer into the production wellbore, closing the annular space above the roof of the productive formation, supplying hydraulic fracturing fluid through the pipe string, with the creation of excess pressure and the formation of a fracture, by pumping the hydraulic fracturing fluid with the input into it proppant particles of the calculated fractional composition, exposure in time. The wells were drilled with their linear three-row arrangement. The injection wells are located in the outer rows of injection wells of the five rows of all wells, and the production wells are located in the three inner rows of production wells of the five rows of all wells. Liquid injection into injection wells and oil extraction from wells of the middle row are sequentially stopped, followed by pressure restoration in the reservoir, hydraulic fracturing is performed in the wells of the middle row of production wells through one well, the wells of the middle row of production wells are put into operation with the simultaneous shutdown of the production wells of the extreme rows of producing wells. After restoring pressure in the formation, hydraulic fracturing of the production wells of the extreme rows of production wells is carried out, located through one well and in a checkerboard pattern with respect to the wells of the middle row of production wells, and then oil extraction from all production wells is resumed.

EFFECT: improving the efficiency of hydraulic fracturing with edge flooding by successively restoring the initial state of the formation isotropic in terms of horizontal stresses in the bottomhole zone of each well, which became anisotropic as a result of the operation of the injection well.

1 cl, 5 dwg