The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 2022
Filed:
Jul. 14, 2020
Southwest Petroleum University, Sichuan, CN;
Ming Zhou, Sichuan, CN;
Hongjun Tu, Sichuan, CN;
Xiao Guo, Sichuan, CN;
Jinfeng Zhang, Sichuan, CN;
Juncheng Bu, Sichuan, CN;
Peng'ao Peng, Sichuan, CN;
Hongchang Han, Sichuan, CN;
Linkai Li, Tianjin, CN;
Mao Liao, Sichuan, CN;
Yinhua Gu, Sichuan, CN;
Rongjun Yi, Sichuan, CN;
Yongqiang Shi, Henan, CN;
Liangliang Xia, Henan, CN;
Southwest Petroleum University, Sichuan, CN;
Abstract
The present invention disclosed a method for preparing a thickener for tight oil and gas reservoir, which relieves damages. The technical solution includes the following steps: putting a three-flask in ice; adding perfluoroalkyl alcohol, P-toluenesulfonyl chloride and pyridine; reacting for 3 h at 0-20° C.; adding filter paper; ultrasonic dispersing for 1 h; removing the filter paper; washing the solution for 3-5 times by adding dilute hydrochloric acid to collect the intermediate product (I); adding 1,3-dihydroxy-propane-2-tert-butyl carbamate and the intermediate product (I) in another three-flask; adding potassium carbonate and N,N-dimethylformamide; reacting for 4 h at 40° C. to collect the intermediate product (II); adding trifluoroacetic acid and methylene chloride into the intermediate product (II); reacting at 45° C. for 2 h; extracting and vacuum drying; and adding 1,6-hexamethylene diisocyanate; reacting for 2 h to collect the final product (III).