| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: invention relates to oil recovery involving use of aqueous hydrochloric acid-based chemicals serving for integrated hydrochloric acid action on bottomhole oil formation zone in order to intensify oil and gas inflow therefrom, which invention being, in particular, designed for use in cases necessitating increase of oil recovery from low-permeable carbonate formations saturated with extra-heavy oil. -based composition contains 5-7% of aqueous acetic acid solution, 35-40% of by-product of sulfuric acid-catalyzed isobutylene/formaldehyde condensation taking part in production of isoprene, notably dimethyl-m-dioxan, and 20% aqueous hydrochloric acid to 100%. ^ EFFECT: increased bottomhole formation zone treatment efficiency due to stability of composition and depth, to which composition penetrates into carbonate formation, and also augmented choice of acid reagents for treatment of low-permeable formations. ^ 4 tbl |
