HYDROFRACTURING METHOD FOR FORMATION IN WELL Russian patent published in 2015 - IPC E21B43/267 C09K8/62 

FIELD: oil and gas industry.

SUBSTANCE: method includes perforation of the well walls in the formation interval with channels having depth not less than length of stress concentration zone in rocks from the borehole, running in the pipe string with a packer, packer setting above the roof of the perforated producing reservoir, determining overall volume of jellied breakdown agent, generating breakdown pressure in below-packer zone by injecting jellied breakdown agent - linear gel - to the well through the pipe string until fracture is formed in the reservoir, injecting of fracture binding agent to the fracture, pressure relief in the pipe string, packer releasing and packer removal with the pipe string from the well. Upon fracture forming in the formation volume of jellied breakdown agent is divided into two even portions and used as the carrier fluid for fracture binding agent. At that in the first part the carrier fluid is injected with fracture binding agent - proppant of fraction 20/40 mesh with concentration of 600 kg/m³, and the second part is divided into two even portions. At first the first portion of the carrier fluid is injected with fracture binding agent consisting of proppant with fraction of 20/40 mesh and proppant with fraction of 16/20 mesh and granulated lime in ratio of 40%:40%:20% with concentration of 800 kg/m³ of each component, and further the second portion the carrier fluid is injected with fracture binding agent consisting of proppant with fraction of 16/20 mesh and proppant with polymer coating with fraction of 16/20 mesh and granulated lime in ratio of 20%:60%:20% with concentration of 1000 kg/m³ of each component. Thereafter to the pipe string 25% aqueous solution of acetic acid is injected in volume equal to volume of the injected carrier fluid with granulated lime and flushed to bottomhole zone by process fluid, then pause for reaction is taken for 4 h.

EFFECT: improving the efficiency of hydraulic fracturing.

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