Patent · US Expired

Aqueous surfactant mixtures, and the use thereof in the recovery of crude oil

US4970007A · kind A · utility

8Cited by

5References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Dennis Miller · Kelkheim, DE
Manfred Schmidt · Krefeld, DE
Arno Holst
Sigmar-Peter von Halasz · Kelkheim, DE

Key dates

Filing date	Mar 8, 1989
Grant date	Nov 13, 1990
Priority date	—
Expiry date	Mar 8, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S507/938
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Surfactant mixtures made from 5 to 80% by weight of an ether sulfonate, 5 to 80% by weight of an alkyl or alkylphenol polyglycol ether and 10 to 80% by weight of an alkanesulfonate, petroleumsulfonate or alkylbenzenesulfonate. This combination of surfactants produces stable, aqueous solutions or dispersions which are highly suitable for surfactant flooding in tertiary oil recovery since these aqueous surfactant solutions or dispersions form microemulsions with the oil even at high salinities.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.