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Title:
TRI-CATIONIC VISCOELASTIC SURFACTANT, PREPARATION METHOD THEREFOR, APPLICATION THEREOF AND CLEAN FRACTURING FLUID
Document Type and Number:
WIPO Patent Application WO/2019/136782
Kind Code:
A1
Abstract:
Disclosed is a tri-cationic viscoelastic surfactant, a preparation method therefor, an application thereof, and a clean fracturing fluid. The invention utilizes N,N'-dimethyl-1,3-propanediamine and epichlorohydrin to prepare an intermediate A, and then uses the intermediate A and fatty acid amide propyl dimethylamine to prepare the tri-cationic viscoelastic surfactant. The preparation process is simple. In addition, a clean fracturing fluid of the present invention having the surfactant demonstrates excellent temperature resistance, wear resistance, and strong sand suspending capabilities. The invention is easily prepared on-site, has automatic gel breaking properties, causes minimal damage to the stratum, is low cost, and features a simple preparation process. Moreover, the fracturing fluid has high temperature resistance, and the viscosity of the product can remain at 42 mPa·s at 180 °C, 170 s-1 after 80 minutes, which is higher than the viscosity requirement (>25 mPa·s) of a clean fracturing fluid used for on-site work.

Inventors:
MAO, Jincheng (No.8, Xindu Avenue Xindu Distric, Chengdu Sichuan 0, 610500, CN)
FAN, Jinming (MAO Jincheng, No.8 Xindu Avenue, Xindu Distric, Chengdu Sichuan 0, 610500, CN)
ZHAO, Jinzhou (MAO Jincheng, No.8 Xindu Avenue, Xindu Distric, Chengdu Sichuan 0, 610500, CN)
YANG, Xiaojiang (MAO Jincheng, No.8 Xindu Avenue, Xindu Distric, Chengdu Sichuan 0, 610500, CN)
Application Number:
CN2018/074502
Publication Date:
July 18, 2019
Filing Date:
January 29, 2018
Export Citation:
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Assignee:
SOUTHWEST PETROLEUM UNIVERSITY (MAO Jincheng, No.8 Xindu Avenue, Xindu Distric, Chengdu Sichuan 0, 610500, CN)
International Classes:
C07C233/36; C07C231/12; C07C233/38; C09K8/68; C09K8/86
Attorney, Agent or Firm:
CHENGDU ZHENGHUA PATENT AGENCY (LI Rui, No.2412Building 1, Third Period of Longxinjiuxi Square,No.37 in Jiancai Road, Chenghua Distric, Chengdu Sichuan 0, 610000, CN)
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