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:
Oct. 10, 2017
Filed:
Apr. 17, 2017
China University of Petroleum (Beijing), Beijing, CN;
Guancheng Jiang, Beijing, CN;
Yinbo He, Beijing, CN;
Deli Gao, Beijing, CN;
Xianmin Zhang, Beijing, CN;
Xianzhu Wu, Beijing, CN;
Lili Yang, Beijing, CN;
Guangchang Ma, Beijing, CN;
Fan Liu, Beijing, CN;
Gang Qu, Beijing, CN;
Li Zhao, Beijing, CN;
Haifang Sun, Beijing, CN;
Liexiang Han, Beijing, CN;
China University of Petroleum (Beijing), Beijing, CN;
Abstract
The present invention relates to the well drilling field in petrochemical industry, and discloses a drilling fluid additive composition and water-based drilling fluid suitable for horizontal shale gas wells. The composition comprises a nano-plugging agent, a bionic wall bracing agent, a bionic shale inhibitor, an emulsifier, and an amphiphobic wettability reversal agent, wherein, the nano-plugging agent is modified silicon dioxide nano-particles, and its modifying group includes an acrylic copolymer chain; the bionic wall bracing agent is carboxymethyl chitosan with a dopamine-derived group grafted on its main chain; the bionic shale inhibitor is composed of structural units of arginine and structural units of lysine; and the amphiphobic wettability reversal agent is a dual-cation fluorocarbon surfactant. The drilling fluid containing the additive composition provided in the present invention has high temperature-resistance, high plugging and high inhibition performance, is environment friendly, especially has high density, and is applicable to shale gas mining.