METHOD OF HYDRAULIC FRACTURING OF A LAY IN THE WELL Russian patent published in 2018 - IPC E21B43/267 

FIELD: oil production industry.

SUBSTANCE: invention relates to oil production industry and can be used for hydraulic fracturing. Method for hydraulic fracturing in a well involves perforating channels in the walls of the casing string in the formation interval, lowering of casing string with the packer, landing of the packer above the roof of the perforated productive formation, pumping of the gelled fracturing fluid into the below-packer zone, creating fracturing pressure in the below-packer zone with the formation of a fracture with the subsequent cyclic injection of the gelled liquid with proppant, flushing of a gelled liquid with proppant into the formed fracture, prior to hydraulic fracturing, a test-injection is performed, clamping pressure of rocks is determined, then the fracturing process is cyclically conducted, wherein each cycle of the process consists of five consecutive stages: injection of a gelled liquid of rupture with a viscosity of 400 cps, injection of a gelled liquid with a viscosity of 400 cps with a proppant, flushing of a gelled fracture fluid with a viscosity of 400 cps with a proppant into the fracture crack by injecting a gelled fracture fluid with a viscosity of 40 cPs; stopping pumping for the time of the decline in the supply pressure below the pressure of closing rocks, spouting of spent gelled fluids from the fracture into a vessel through fittings with diameters of 2, 4, 8 mm, at that from the first to the penultimate cycle of the injection and at the 3 stage, the gel liquid with proppant is over-flushed into a crack, and in the last cycle and at the 3 stage, over-flushing of the gelled liquid with proppant into the fracture is performed and the proppant is left the well.

EFFECT: technical result is the simplification of the technology, the increase in the efficiency of the hydraulic fracturing, the increase in the fracture coverage of fractures with increasing their conductivity.

1 cl, 4 dwg