METHOD OF HYDRAULIC FORMATION FRACTURING Russian patent published in 2017 - IPC E21B43/267 E21B43/112 C09K8/80 

FIELD: oil and gas industry.

SUBSTANCE: method involves carrying out the perforation in the formation interval of the well oriented in the direction of the main maximum stress, lowering the tubing string (TS) with the packer into the well, the packer seating, performing the hydraulic fracturing treatment (HFT) by pumping the hydraulic fracture liquid by means of the TS with the packer through the perforated interval to the production formation with obtaining the fracture and its further fixation in the formation by means of cyclic alternating pumping a carrier liquid with proppant via the tubing string, relieving the pressure in the well, releasing the packer, and extracting the tubing string with the packer from the well. To perform the perforation, a hydromechanical perforator on the tubing string is lowered into the well up to the formation sole interval, the pairs of perforation openings are drilled along the perimeter of the well from the sole to the roof of the formation with offset by an angle of 30° when performing each pair of perforation openings. After the perforation, the tubing string with the perforator is removed from the well, the hydraulic fracturing fluid is represented by gelled oil, the total volume of the gelled oil is determined, and the gelled oil is pumped via the tubing string into the formation interval to form a fracture. The volume of the gelled oil after the fracture formation is used as the carrier fluid during the fracture fixation process. Wherein before the fracture is fixed, the volume of residual gelled oil is divided into two equal parts, and both equal parts of the gelled oil are pumped in five cycles in alternating equal portions of ultralight proppant of a 40/80 mesh fraction, coated with the water-swelling rubber-polymer composition with the concentration of 600 kg/m³, with the glassfill filler in the amount of 1 to 1.8% by the proppant weight, with the stepwise increase by 0.2% in each batch, and equal batches of proppant with the size of 20/40 mesh fraction with the stepwise increase in concentration in each batch by 200 kg/m³, starting from 200 to 800 kg/m³. Wherein as the fifth batch, RSP-proppant fraction of 12/18 mesh concentration of 1000 kg/m³ is pumped.

EFFECT: increasing the efficiency of the fracture insulation from associated and plantar water, increasing the fracture conductivity and the reliability of the method implementation, improving the fixation quality of the bottomhole formation zone, reducing the additional costs.

5 dwg, 1 tbl