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:
Aug. 29, 2017
Filed:
Mar. 22, 2017
China University of Petroleum (Beijing), Beijing, CN;
Guancheng Jiang, Beijing, CN;
Shuanglei Peng, Beijing, CN;
Yinbo He, Beijing, CN;
Zhengqiang Deng, Beijing, CN;
Lili Yang, Beijing, CN;
Fan Liu, Beijing, CN;
Deli Gao, Beijing, CN;
Xinliang Li, Beijing, CN;
Yawei Shi, Beijing, CN;
Kai Wang, Beijing, CN;
Chunlei Wang, Beijing, CN;
Guangchang Ma, Beijing, CN;
Li Zhao, Beijing, CN;
Gang Qu, Beijing, CN;
China University of Petroleum (Beijing), Beijing, CN;
Abstract
The present invention relates to the well drilling field in petroleum industry, in particular to an additive composition suitable for viscosity reduction of oil-based drilling fluids, an oil-based drilling fluid and use thereof. The double-block copolymer mainly consists of a block A and a block B, wherein, the block A is composed of structural units represented by formula (1), the block B is composed of structural units represented by formula (2), and the number-average molecular weight of the block A is 1,500-10,000. The double-block copolymer provided in the present invention can be used as a viscosity reducer in oil-based drilling fluids, especially can be used as a viscosity reducer in high-density clay-free oil-based drilling fluids, and can greatly decrease the apparent viscosity and plastic viscosity of oil-based drilling fluids in high-temperature and high-pressure reservoir while maintaining appropriate shearing force, so as to increase the drilling rate and reduce drilling difficulties.