METHOD FOR INCREASING INJECTIVITY OF TERRIGENOUS CLAY-BEARING BED Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this is aimed at increasing efficiency of treating terrigonous clay-bearing bed, reducing bed treating period and cutting amount of complexing agent used. According to method, injected into bed at first stage are hydrofluoboric acid and complexing agent, and injected at second stage are mixtures of acidic hydrochloric acid, hydrofluoric acid, and complexing agent. Interval between first and second stages, amounts and concentration of components are sufficient for proper reaction with bed. Used as complexing agent is nitriloacetic acid or acidic diaminopropanol. EFFECT: high efficiency. 1 cl, 1 tbl