METHOD FOR WELL INTENSIFICATION, EXPOSING LOW-PERMEABLE FORMATION Russian patent published in 2016 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for intensification of well operation, exposing a formation with a low-permeable Domanic reservoir. During well operation intensification, exposing a low-permeable formation, method comprises test pumping of fracturing fluid and packs of fracturing fluid with proppant, correcting fracturing project and main hydraulic fracturing process using fractions of proppant, which include only a fine fraction of size not larger than 30/60 mesh, with final proppant concentration of not more than 250 kg/m³, with final under-flush of mixture in a volume of 0.1-0.5 m³. In low-permeability Domanic reservoirs with absolute permeability of not more than 1 mD, formations are perforated with a perforation system, which creates holes with diameter not less than 20 mm, equipment is used, calculated for surface pressure during treatment of up to 100 MPa, method includes preliminary acid treatment for initiation and etching of fractures in an amount of not less than 2 m³ thickened acid per 1 running m of formation, during main hydraulic fracturing process, proppant concentration is created in range from 100 to 250 kg/m³ with the initial value of concentration of not more than 100 kg/m³. When pumping proppant concentration is increased at a pitch of not more than 30 kg/m³, not exceeding value in final stage of 250 kg/m³ with correction of concentration values depending on growth of wellhead pressure by controlling fluid flow rate, but not exceeding wellhead pressure values of 100 MPa.

EFFECT: technical result consists in intensification of well, exposing low-permeable formation with low-permeable Domanic reservoir.

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