RESERVOIR BOTTOMHOLE ZONE ACID TREATMENT COMPOSITION Russian patent published in 2010 - IPC C09K8/74 

FIELD: oil-and-gas industry.

SUBSTANCE: reservoir bottomhole zone acid treatment composition includes, wt % inhibited hydrochloric acid 24.0 - 48.0, polymer - polyvinyl spirit or polyvinylacetate 0.1-2.5, surface active substance SAS - synthenol ALM-7 or glycol, or diproksamin 157-65M 0.25-0.3, iron stabiliser - citric acid or oxalic acid 0.05-0.3, the rest is water, at that the composition prepared with a serial adding the inhibited hydrochloric acid with stirring, of the mentioned above polymer, SAS, stabilised iron. Additionally composition contains fluorine-hydrogen acid in a quantity of 4.0-10.0% wt.

EFFECT: decrease of a mudding elements, generating at acid exhaustion in the acid treatment composition reaction process with a reservoir rock, at simultaneous acid treatment composition preparation simplification, which possess a creeping reaction speed with the reservoir rock and allow to increase the reservoir treatment area.

2 cl, 2 tbl, 2 ex