FIELD: oil and gas industry.
SUBSTANCE: acid composition for treatment of bottom-hole zone of carbonate reservoir contains in wt %: inorganic or organic acid, or their mixtures 9.0-24.0; zwitterion surface-active substance - alkyl betaine 1.0-10.0; hydrophobically-modified urethane polymer 0.05-3.0; water - rest. The acid composition can additionally contain anionic surface-active substance in amount of 0.1-3.0 wt %.
EFFECT: alignment of injectivity profile of injection or inflow profile of the production wells in carbonate reservoirs with non-uniform permeability, creation of new fluid conducting channels through entire perforated thickness of the reservoir, restoration of reservoir characteristics of bottom-hole zone due to its cleaning of mud solid particles, increased thermal stability of injected acid composition.
2 cl, 1 tbl, 16 ex, 4 dwg
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