Title:
VISCOELASTIC SURFACTANT FOR HIGH TEMPERATURE SELF-DIVERTING ACID, PREPARATION METHOD THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/098240
Kind Code:
A1
Abstract:
Disclosed is a viscoelastic surfactant for a high temperature self-diverting acid, having a structural formula (I), wherein n is a saturated alkane having 2 to 8 carbon atoms, R1 is a saturated or unsaturated alkane having 18 to 28 carbon atoms, each of R2 and R3 is independently methyl, ethyl, or a hydrogen atom, R2 and R3 can be the same or different, and X— is any one of Cl—, Br—, F—, CO3
2-, SO4
2-, HCOO—, and CH3COO—. A method for preparing the surfactant comprises: performing an acid-amine condensation reaction of a fatty acid and an organic amine to form an intermediate product, then reacting same with a metal hydride to form a fatty amine, and then protonizing same by adding an acid liquid, so as to obtain a super-long chain viscoelastic cationic surfactant. Also provided is the use of the surfactant as a thickening diversion agent of a self-diverting acid. A self-diverting acid, with the surfactant of the present invention as the thickening diversion agent thereof, can be used at a high temperature of 150ºC, and has the advantages of a stable structure, thickening an acid liquid, homogeneous acidification, and automatic diversion, etc.
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Inventors:
FENG YUJUN (CN)
WANG JI (CN)
YIN HONGYAO (CN)
WANG JI (CN)
YIN HONGYAO (CN)
Application Number:
PCT/CN2019/087290
Publication Date:
May 22, 2020
Filing Date:
May 16, 2019
Export Citation:
Assignee:
UNIV SICHUAN (CN)
International Classes:
C09K8/60; C09K23/18
Domestic Patent References:
| WO2017174424A1 | 2017-10-12 |
Foreign References:
| CN109486476A | 2019-03-19 | |||
| CN107088385A | 2017-08-25 | |||
| CN101798274A | 2010-08-11 | |||
| CN102585797A | 2012-07-18 |
Attorney, Agent or Firm:
CHENGDU HONGSHENG HUIQUAN PATENT AGENCY CO., LTD (CN)
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