Acidizing method using microemulsion

US4650000A · kind A · utility

Assignees

• Berol Kemi AB
• Tendex Kjemi Service A/S · NO

Inventors

• Eva Andreasson · Stockholm, SE
• Finn Egeli · Stavanger, NO
• Krister Holmberg · Mölndal, SE
• Borje Nystrom · Knivsta, SE
• Kjell Stridh · Stenungsund, SE
• Eva sterberg · Göteborg, SE

Key dates

• Filing date: Nov 6, 1985
• Grant date: Mar 17, 1987
• Expiry date: Nov 6, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S507/933
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Formations surrounding oil wells, gas wells, injection wells and similar bore holes are treated by the injection of a microemulsion containing an acid solution. The main surfactant of the microemulsion is characterized by having at least two hydrocarbon groups attached to a nitrogen atom via a polar groups.