Title:
CONCENTRATED OPPOSITELY CHARGED SURFACTANTS USED FOR CHEMICAL ENHANCED OIL RECOVERY UNDER HIGH SALINITY AND HIGH TEMPERATURE RESERVOIR CONDITIONS
Document Type and Number:
WIPO Patent Application WO/2023/123132
Kind Code:
A1
Abstract:
A process for reducing the interfacial tension between a hydrocarbon fluid and a surfactant mixture during chemical enhanced oil recovery includes introducing a surfactant mixture solution comprising an anionic surfactant, a cationic surfactant, a nonionic surfactant, a brine solution, and a co-solvent to a hydrocarbon-bearing reservoir under conditions of a salinity of greater than or equal to 50,000 mg/L, a hardness of greater than or equal to 2, 500 mg/L, and a temperature of greater than or equal to 90 ℃, thereby reducing the interfacial tension at a liquid-liquid interface of the hydrocarbon fluid and the surfactant mixture solution. The anionic surfactant comprises organosulfate. The cationic surfactant comprises quaternary ammonium, brominated trimethylammonium, chloride trimethylammonium, or combinations thereof. The nonionic surfactant comprises polyoxyethylene fatty acid ester, phenylated ethoxylate, or combinations thereof.
Inventors:
XU LIMIN (CN)
HAN MING (SA)
HAN MING (SA)
Application Number:
PCT/CN2021/142710
Publication Date:
July 06, 2023
Filing Date:
December 29, 2021
Export Citation:
Assignee:
SAUDI ARABIAN OIL CO (SA)
ARAMCO FAR EAST BEIJING BUSINESS SERVICES CO LTD (CN)
ARAMCO FAR EAST BEIJING BUSINESS SERVICES CO LTD (CN)
International Classes:
C09K8/584; E21B43/16
Foreign References:
| CN104650841A | 2015-05-27 | |||
| US20160122622A1 | 2016-05-05 | |||
| US20110160103A1 | 2011-06-30 | |||
| US20160075932A1 | 2016-03-17 |
Attorney, Agent or Firm:
SUNSHINE INTELLECTUAL PROPERTY INTERNATIONAL CO., LTD (CN)
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