METHOD FOR STIMULATING OIL AND GAS RESERVOIRS Russian patent published in 2021 - IPC E21B43/267 C09K8/62 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of the oil and gas industry; it is intended to increase a recovery coefficient of oil and gas in low-permeable reservoirs, as well as to involve difficult-to-recover, unconventional and unprofitable hydrocarbon reserves in the development. In a hydraulic fracturing method, at the pressure higher than the hydraulic fracturing pressure, liquid with a friction reducer with low viscosity of less than 10 cP is first injected, then a mixture of the specified liquid with a wedging agent is injected. The injection of the specified liquid and the mixture is alternated, wherein the mixture is pumped in portions. Next, linear gel with viscosity of 10-30 cP is injected, then a mixture of the specified linear gel and a wedging agent is injected. The injection of the specified linear gel and the mixture is alternated, wherein the mixture is pumped in portions. Next, cross-linked gel with viscosity of more than 100 cP is injected. Then, a mixture of the specified cross-linked gel and a wedging agent is injected in portions. Then, pressing is carried out first with the specified cross-linked gel, then with the specified linear gel. Each injection takes place with a flow rate of more than 10.5 m³/min. The total volume of injected liquids and mixtures does not exceed 2000 m³.

EFFECT: technical result is an increase in the drainage zone of the well by creating the branching system of artificial conducting channels inside the reservoir.

1 cl, 2 dwg, 1 tbl