METHOD FOR TREATING BOTTOM-HOLE ZONE OF INJECTION WELL Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: method can be used in operations aimed at levelling of injectivity profile in injection wells. According to method, pumped into production zone is plugging material which is resistant to action of acid in oil bed conditions. Then acid is pumped in at pressure which is below than pressure of injecting plugging material. Plugging material - acid pumping cycles are repeated at increasing acid injection up to plugging material pumping-in pressure. Ratio of volume of injecting plugging material and acid is taken as proportional to ratio of receiving and non-receiving zones of productive reservoir in well. EFFECT: high efficiency.