METHOD OF HYDRAULIC FRACTURING IN INJECTION WELL Russian patent published in 2016 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for hydraulic fracturing in injection well. During formation hydraulic fracturing in injection well, method includes perforating walls of well in well formation interval, lowering of string with a packer, installation of packer above roof of perforated productive formation, pumping into under-packer zone a gelled fracturing fluid in form of cross-linked or linear gel, creation of hydraulic fracturing pressure in under-packer zone and flushing into formed fracture gelled fracturing fluid with proppant of medium and/or coarse fractions with final proppant concentration not less than 800 kg/m³. Preparation of fracturing fluid is performed with a load of gelling agent with concentration of not more than 3.0 kg/m³ during preparation of cross-linked gel or with a load of not more than 4 kg/m³ during preparation of linear gel, proppant used is acid-proof, and after hydraulic fracturing well is flushed with a solution of surfactant in formation water and solution of surfactant in formation water is pumped into fracture.

EFFECT: longer efficiency of hydraulic fracturing.

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