METHOD FOR TREATMENT OF BOTTOM-HOLE FORMATION ZONE Russian patent published in 1996 - IPC

FIELD: oil producing industry; applicable in treatment of bottom-hole producing carbonate formation zone. SUBSTANCE: method for treatment of bottom-hole formation zone includes successive injection into formation of chemical reagents reacted with one another. After injection of each chemical reagent, separating substance is injected, and mechanical flexible disconnector is introduced into well. Separating substance is used in form of inert substance with density lower than that of injected reagents. The inert substance is injected in the volume equalling 1-3 volumes of casing string- borehole annulus of perforation interval. Injected into wells drilled with sump, prior to injection of chemical reagents through tubing, is inert substance with density exceeding that of each injected reagent up to sump filling. EFFECT: higher efficiency of treatment of bottom-hole formation zone and provision of safety due to reaction of reagents in formation and their more complete reaction, and increased efficiency of treatment of bottom-hole formation zone of wells drilled with sump. 2 cl