FIELD: oil and gas production.
SUBSTANCE: invention relates to reducing clay constituent in critical areas of formation of both production and injection wells represented by low-permeation clayey terrigenous reservoir and/or of wells with reduced productivity due to clogging of pores with built-in foreign clayey material. Composition of invention contains 15.0-90.0% aqueous hydrochloric acid, 0.5-5.0% diammonium phosphate as additive, and solvent. In preferable embodiments, composition further contains 0.1-2.0% surfactant and/or 0.2-8.0% hydrofluoric acid. Composition produces enhanced favorable effect on critical area of formation owing to reduced swelling of clay, activation and dispersing followed by lifting of clayey material during well development period.
EFFECT: increased permeability of critical area of formation and slowed corrosion of oil-field equipment.
3 cl, 2 tbl, 27 ex
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