METHOD FOR LEVELLING INJECTIVITY PROFILE WITH SIMULTANEOUS BACTERICIDAL TREATMENT Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: method can be used in performing various operations in injection wells. For realization of method, selected is injection well with injectivity of not less than 100 cu.m/day with large flooding of producing wells located within zone of influence of injection well and with increased content of hydrogen sulfide in product of wells. Method includes interval after interval treatment of beds by injecting water-isolating and bactericidal agent in high-permeable interval of first buffer including fresh water, 0.02-0.03% solution of potassium permanganate in fresh water. Second buffer is made up of fresh water and effluent water which are injected under pressure at 5-10% higher than working injection pressure. Then, technological pause is undertaken. Injected into low-permeable intervals is intensifying agent. Application of aforesaid method ensures effective levelling of injectivity profile together with simultaneous bactericidal treatment. EFFECT: higher efficiency. 1 ex