METHOD FOR REPEATED HYDRAULIC FRACTURING Russian patent published in 2024 - IPC E21B43/267 E21B33/138 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to oil industry. In the method of repeated hydraulic fracturing of hydraulic fracturing formation, including creation of geomechanical barrier in the interval of the old previously created fracture from the previous hydraulic fracturing, which worked out its resource, by pumping into the specified interval of colmatage composition and its subsequent process sedimentation, performing hydraulic fracturing, forming a new fracture or fractures in sections of the formation, previously not involved or weakly involved in the development process, the colmatage composition is pumped in volumes from 10 to 1500 m³ depending on injectivity index of formation wells at stepwise increase of injection pressure to pressure exceeding pressure of hydraulic fracturing, performing opening and filling the volume of said old hydraulic fracture with a colmatating composition, plugging the formation rock matrix and proppant packing of said old hydraulic fracture. Process settling time - the time required to close the said old hydraulic fracture - makes 2 to 10 hours. Hydraulic fracturing is performed throughout the section with proppant weight from 3 to 10 t per meter of perforated thickness. Colmatage composition used is a suspension composition with an increasing concentration of the main substance in the concentration range from 1 to 3% or polymer composition with increasing concentration of polymer base in concentration range from 1 to 5% and with increasing concentration of cross-linking agent in concentration range from 0.1 to 0.5%.

EFFECT: increased degree of oil and gas reserves recovery, increased profitable period of operating production wells, commissioning of idle stock of wells stopped due to high water content of the produced product, increased rate of oil extraction, increased oil recovery factor.

1 cl, 4 dwg, 1 tbl, 2 ex