LOW-PERMEABILITY FORMATION DEVELOPMENT METHOD Russian patent published in 2021 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used to develop low-permeability and shale hydrocarbon-saturated formations. The proposed method for the development of low-permeability formations includes hydraulic fracturing by injecting a cross-linked polymer gel at a flow rate of 3-4.5 m³ / min with proppant fractions 12 / 18-20 / 40 with a concentration of 200-800 kg / m³, as well as granular metal with subsequent holding for a time closure of the crack and destruction of the gel, thermochemical treatment with 9-15% hydrochloric acid, which is carried out at a flow rate of 3-4.5 m³ / min, and additionally injection of a low-viscosity linear gel with proppant fractions 20 / 40-100 mesh is conducted at a concentration of 100-400 kg / m³, as well as granular metal.

EFFECT: expansion of range of technical means for the development of low-permeability formations by hydraulic fracturing, increasing the efficiency of hydraulic fracturing, while ensuring enhanced oil recovery of low-permeability and shale hydrocarbon-saturated formations.

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