METHOD OF HYDRAULIC BREAKDOWN OF FORMATION Russian patent published in 2017 - IPC E21B43/267 E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: invention can be applied for hydraulic fracturing treatment (HFT) in a producing well in the presence of associated and/or bottom water. The method involves performing the perforation in the range of well formation oriented in the direction of the main maximum voltage, landing of tubing string with packer to a well, packer seating, performing HFT by hydraulic fracture liquid injection by the tubing string with packer through perforated interval to the production string with obtaining and further fracture fixation by propping agent, pressure relief in the well. To perform perforation hydromechanical perforator is lowered on tubing string to the well before the footing interval, a pair of perforations are made along the perimeter of the well from the bottom to the top of formation at an angle of 30° off-centre when making each pair of the perforations, after the perforation is made NFT with a perforator is removed from the well and then NFT with parker is lowered into the well and packer is seated at the well, before HFT is performed, volumes of fracturing fluid for the formation of fracture, the elastomer added to the fracturing fluid, proppant for fixing the fracture are sequentially determined, and then HFT is performed. Gelled oil is used as the fracturing fluid, the amount of the gelled oil is divided into two equal portions, the first portion is pumped into the first half of the gelled oil volume and HGT is performed forming a fracture, the second portion is pumped into the second half of the gelled oil volume adding granular water-swellable elastomer to create a water shutoff screen over the entire surface of the fracture from the granular water-swellable elastomer, then the fracture is fixed by injecting liquid carrier of gel crosslinked with proppant at first of fine fraction of 20/40 mesh in an amount of 55-60% by weight of the proppant, then the coarse fraction of 16/20 mesh in an amout of 40-45% of the total proppant weight with stepwise increasing concentration of proppant to 100 kg/m³, from 200 kg/m³ to 1200 kg/m³.

EFFECT: elimination ofwater break through the frqaction, increased conductivity of the fraction and reliability of the method, reducing costs by eliminating the participation of the geophysical party, reducing the duration of the HFT technological process.

5 dwg