METHOD FOR THERMOCHEMICAL TREATMENT OF HOLE BOTTOM ZONE Russian patent published in 1994 - IPC

FIELD: oil industry. SUBSTANCE: method involves successive injection of oxygen-containing organic compound into hole bottom zone. Said compound may be methyl or ethyl alcohol, acetate, dimethyl ether, acetic ether, glycerine or mixtures thereof, saturated aqueous solution of potassium nitrate and/or sodium nitrate, 30-35% aqueous solution of muriatic acid. After injection of all reagents into the hole bottom zone the hole is held until the increased pressure in the zone starts dropping, then the formation fluid is stimulated. The amount of reagent is found from mathematical expressions. The oxygen-organic compound can be mixed before injection with 30-35-% aqueous solution of muriatic acid. Said solution may additionally contain a surfactant. EFFECT: higher efficiency. 4 cl