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:
Apr. 09, 2019
Filed:
Sep. 13, 2018
China University of Petroleum (Beijing), Beijing, CN;
Guancheng Jiang, Beijing, CN;
Deli Gao, Beijing, CN;
Shuo Zhang, Beijing, CN;
Yong Wang, Beijing, CN;
Xianzhu Wu, Chengdu, CN;
Liexiang Han, Beijing, CN;
Xiangzeng Wang, Beijing, CN;
Chunyao Peng, Beijing, CN;
Yinbo He, Beijing, CN;
Fan Liu, Beijing, CN;
Hongguo Zuo, Beijing, CN;
Yongqing Zhang, Beijing, CN;
Lili Yang, Beijing, CN;
Zhong Li, Beijing, CN;
Yanjun Li, Beijing, CN;
Abstract
The present invention relates to the well drilling field in the petroleum industry, particularly to film former used for coal-bed gas well drilling and preparation method thereof, drilling fluid and usage thereof. The preparation method of the film former includes: (1) controlling polycaprolactone diol and diisocyanate to have a first polymerization reaction in the presence of a polyurethane catalyst, to obtain a polyurethane prepolymer with two ends blocked by diisocyanate; (2) controlling the product of the first polymerization reaction to have a chain extension reaction with a polyalcohol; (3) controlling the product of the chain extension reaction and one part of hydroxyalkyl acrylate monomer to have an additive reaction, and then introducing the other part of hydroxyalkyl acrylate monomer and a styrene monomer, and emulsifying in water to obtain an emulsion; (4) mixing a radical initiator with the emulsion to have a second polymerization reaction.