FIELD: oil industry.
SUBSTANCE: group of inventions relates to the oil industry. Method of treating an underground geological formation involves feeding a buffered acid treatment fluid containing a monochloroacetic acid monobasic salt and at least one acid into said underground geological formation. Underground geological formation contains carbonate rock. PH of said buffered acid treatment fluid ranges from 1.2 to 5. Monochloroacetic acid monobasic salt is present in the buffered acid treatment fluid in amount of 3 to 20 wt.% based on the total weight of the buffered acid treatment fluid. At least one acid is present in the buffered acid treatment fluid in amount of 0.2 to 25 wt.% based on the total weight of the buffered acid treatment fluid. Cation of the monochloroacetic acid monobasic salt is sodium, wherein said at least one acid is selected from hydrochloric acid, perchloric acid, hydrobromic acid, nitric acid, perchloric acid, hydroiodic acid, methanesulphonic acid, p-toluenesulphonic acid or any combinations thereof.
EFFECT: increased efficiency of fluids for delayed acid treatment of underground geological formation.
9 cl, 4 dwg, 6 tbl, 4 ex
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