Title:
GEMINI SURFACTANT FOR OIL DISPLACEMENT, BINARY COMBINATION SYSTEM FOR OIL DISPLACEMENT, AND PREPARATION METHOD FOR AND APPLICATION OF GEMINI SURFACTANT
Document Type and Number:
WIPO Patent Application WO/2021/056665
Kind Code:
A1
Abstract:
Disclosed in the present invention are a gemini surfactant for oil displacement, and a preparation method for and an application of the gemini surfactant. The gemini surfactant is 1,3-dialkyl-1,3-dipolyoxyethylene ether urea or 1,3-dialkyl-1,3-dipolyoxypropylene ether urea. The gemini surfactant for oil displacement provided by the present invention has good chemical stability and excellent salt tolerance in a wide pH range, has good performance in reducing interfacial tension, and can enhance the oil recovery by about 18% when applied in alkali-free binary (surfactant + polymer) combination flooding.
Inventors:
WU XIAOLIN (CN)
CHEN JIE (CN)
WANG HAIFENG (CN)
YANG YONG (CN)
HOU ZHAOWEI (CN)
CHEN JIE (CN)
WANG HAIFENG (CN)
YANG YONG (CN)
HOU ZHAOWEI (CN)
Application Number:
PCT/CN2019/113674
Publication Date:
April 01, 2021
Filing Date:
October 28, 2019
Export Citation:
Assignee:
PETROCHINA CO LTD (CN)
DAQING OILFIELD COMPANY LTD (CN)
DAQING OILFIELD COMPANY LTD (CN)
International Classes:
C09K8/584; C07C273/18; C07C275/10
Foreign References:
CN110746955A | 2020-02-04 | |||
CN102218282A | 2011-10-19 | |||
CN105980351A | 2016-09-28 | |||
CN102806047A | 2012-12-05 | |||
CN103373904A | 2013-10-30 |
Attorney, Agent or Firm:
SHANGCHENG & PARTNERS (CN)
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