FIELD: oil and gas industry.
SUBSTANCE: sandstone formation treatment method includes injecting into the formation a fluid containing 5-30% by weight of the total amount of glutamic liquid N,N-diacetic acid or its salt (GLDA), 0.1-2% by volume of corrosion inhibitor, 0.01-5 % by volume of surfactant and, optionally, a common solvent. The surfactant is a non-ionic or anionic surfactant and has a pH value of between 1 and 14.
EFFECT: improved permeability of sandstone formations, biodegradability and high acidity without the formation of processing fluid scale.
20 cl, 9 dwg, 3 tbl, 10 ex
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