Concentrate for the preparation of oil and water microemulsions having high salinity which are stable at high temperature

摘要

Oil and water microemulsions having a high salt content and intended for assisted petroleum recovery are prepared from a concentrate containing: a mixture of at least three surfactants constituted respectively by a salt of an alkylsulphuric acid, a salt of an alkylaryl sulphonic acid and a salt of a carboxylic acid derivative selected from the group comprising sulphosuccinic acid and sulphosuccinamic acid, at least one cosurfactant constituted by a compound which is capable of forming hydrogen bonds with water.