METHOD OF HYDRAULIC FRACTURING OF A RESERVOIR Russian patent published in 2018 - IPC E21B43/267 

FIELD: oil industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of hydraulic fracturing of a formation in a production well in the presence of associated and / or plantar water. In the method of hydraulic fracturing of a formation, including the descent of a string of pipes with a packer into a well, the planting of a packer, hydraulic fracturing by pumping hydraulic fracturing fluid through a column of pipes with a packer through the interval of perforation into the productive formation with the formation and subsequent fastening of the crack by pumping hydraulic fracturing fluid with proppant, bleeding the pressure from the well, prior to the hydraulic fracturing in the bottomhole zone of the formation, water is pumped with a density of 1,000-1,050 kg/m³ with a flow rate of 1.0 m³/min, then injection of hydraulic fracturing fluid, which is a cross-linked gel, formation of a fracture is initiated along the pipe string in the formation interval, fracture cracks are developed and fastened in two stages, where at the first stage a 30/60 mesh proppant is pumped into the created crack, coated with a water-swelling rubber-polymer composition, with a concentration of 600 kg/m³ in the amount of 50-60% of the total proppant mass with the addition of fiberglass filler in an amount of 1.0% by weight of the proppant, at the second stage, a 20/40 mesh 20/40 mesh proppant is injected cyclically at a rate of 20-25% of the total proppant mass and 40/70 mesh fines, coated with a water-swelling rubber-polymer composition in an amount of 20-25% of the total proppant mass, cyclic injection is carried out in equal portions: 1m³ of crosslinked gel, proppant fraction 20/40 mesh in 1 m³ of crosslinked gel, 1m³ of cross-linked gel, proppant fraction 40/70 mesh in 1 m³ of cross-linked gel with increasing proppant concentration in each cycle, starting at a concentration of 200 to 900 kg/m³, within each cycle between different proppant fractions, a stepwise increase in concentration of 100 kg/m³ is performed, and between the cycles with similar proppant fractions, a stepwise increase in concentration of 200 kg/m³ is performed, last injection cycle is pushed into the crack of the fracture by injecting linear gel in a one and a half times volume of the pipe string.

EFFECT: technical result is the exclusion of watering of the production well through a crack, increase of the conductivity of the crack and the reliability of the method, increase of the stability of fastening of the crack on its surface.

1 cl, 3 dwg, 1 tbl