METHOD FOR ACID TREATMENT OF BOTTOM-HOLE ZONE OF INJECTION WELL Russian patent published in 1998 - IPC

FIELD: oil producing industry. SUBSTANCE: acid treatment of bottom-hole zone of bed is aimed at increasing its productivity. For this purpose, method implies injection of acid through pump-compressor pipes. After that, injected into well through pump-compressor pipes is water in amount equal to single volume of pump-compressor pipes, then water is injected into annular space with discharge through pump-compressor pipes until content of iron in discharged water is equal to its content in injected water. After that, well is brought into operation. Quality of acid treatment is enhanced due to reduced content of iron in water. EFFECT: high efficiency.