ACIDIC COMPOSITION FOR PROCESSING LOW-PERMEABILITY TERRIGENOUS RESERVOIRS Russian patent published in 2010 - IPC C09K8/74 

FIELD: chemistry.

SUBSTANCE: invention relates to oil extracting industry, particularly to compositions for bottom-hole acidising a terrigenous reservoir. The acidic composition contains the following, in wt %: inhibited hydrochloric acid 9.0-15.0, fluorine-containing reagent - hydrofluoric acid or ammonium bifluoride or ammonium fluoride 4.0-7.4, organic solvent - polyethylene glycol - 4 or Glycol-Reagent 5.0-30.0, surfactant - Neonol AF_9-12 0.1-0.2, water - the rest.

EFFECT: preparation of a composition for processing a terrigenous reservoir which has low rate of reaction with the rock at reservoir temperature in order to increase the processed area and reducing the danger of sedimentation, as well as a much lower surface tension value at the boundary with hydrocarbons and low rate of corrosion, compatibility with corrosion inhibitors added into commercial-grade acid; the composition does not form emulsions upon contact with oil or hydrocarbons.

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