FRACTURED RESERVOIR FORMATION METHOD Russian patent published in 2015 - IPC E21B43/247 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method relates to oil and gas industry, namely to improvement methods of well oil and gas recovery. A formation method of a fractured reservoir by pressure of gaseous products involves arrangement in the perforation area of wells of an oxidising compound and fuel, initiation of its firing and fixation of the fracture against closure; in order to increase permeability of the formation and the bottom-hole zone containing alkali and alkaline-earth rocks, they are neutralised by nitric acid till salts of nitrates are formed with exposure during several hours for the acid to react with the rock; combustible components of the rock or the fuel additionally supplied to the well is used as the fuel, and decomposition of salts of nitrates and the fuel till gaseous state is performed by a thermal source supplied to the well: by a powder pressure generator or an iron-aluminium mixture (thermite), or by a combustible and oxidising compound.

EFFECT: increasing the zone of the fractured reservoir and its permeability.