FLUID FOR SECONDARY OPENING-UP OF BED BY PERFORATION Russian patent published in 2003 - IPC

FIELD: oil and gas industry, intensification of influx to wells in process of secondary opening- up of bed by perforation. SUBSTANCE: fluid for secondary opening-up of bed by perforation contains phosphoric acid, hydrocarbon solvent, aqueous salt brine, surface active substance with following proportion of components, mas.%: surface active substance, 0.1-0.2; phosphoric acid, 0.1-10.0; hydrocarbon solvent, 0.1-7.0; aqueous salt brine, the balance. Fluid can carry solvent in the capacity of hydrocarbon solvent and sulfonal in the capacity of surface active substance. EFFECT: increased physical-chemical activity of fluid for obtaining high indices of restoration of conductivity of rock mass and for raising productivity of wells. 2 cl, 2 tbl