METHOD OF GAS-HYDRAULIC IMPACT ON FORMATION Russian patent published in 2019 - IPC E21B43/263 

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used for gas-hydraulic impact on formation. Method comprises perforating a production string in a given interval of formation, assembling and lowering into a well of a unpacklement sectional charge of first combustion, combustion of ignitable and main sections of the first combustion charge with formation of combustion products, pressure and temperature increase and creation of artificial cracks and cavities in the perforation interval of the formation, as well as subsequent assembly and lowering into the housing of the unpackaged sectional charge of the second combustion, installation of this charge in the same interval of formation perforation and burning of igniting and main sections of the second combustion charge with formation of combustion products, development and deepening of artificial cracks and cavities. After combustion of the first combustion charge, the downhole fluid gasified with gaseous and solid combustion products of the first combustion charge is removed, filling the well with non-gasified liquid with higher hydrostatic pressure in the perforation interval than the predetermined formation pressure in the perforation interval, wherein said filling with non-gasified liquid is performed until reaching the value of liquid density coming from the wellhead, values of density of non-gasified liquid supplied with flow rate selected from condition of provision of value of rate of upward flow of liquid in well larger than value of rate of falling of solid particles in it, in amount sufficient for its penetration into formation and not allowing arrival of formation gases and liquid into operating column.

EFFECT: technical result consists in improvement of efficiency of gas-hydraulic impact on formation.

8 cl, 7 dwg