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:
Dec. 05, 2017
Filed:
Apr. 17, 2017
China University of Petroleum (Beijing), Beijing, CN;
Guancheng Jiang, Beijing, CN;
Xianmin Zhang, Beijing, CN;
Yinbo He, Beijing, CN;
Deli Gao, Beijing, CN;
Xianzhu Wu, Beijing, CN;
Lili Yang, Beijing, CN;
Guangchang Ma, Beijing, CN;
Gang Qu, Beijing, CN;
Li Zhao, Beijing, CN;
Fan Liu, Beijing, CN;
Haifang Sun, Beijing, CN;
Wei Ou'Yang, Beijing, CN;
Jienian Yan, Beijing, CN;
Junbin Chen, 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 comprising 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-particle, and its modifying group includes a modifying 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 present invention further provides a pseudo oil-based drilling fluid suitable for horizontal shale gas wells containing the above composition. When the water-based drilling fluid contains the drilling fluid additive composition provided in the present invention, the water-based drilling fluid would have high temperature-resistance, high plugging and high inhibition performance, is environment friendly, especially have high density, and is especially suitable for horizontal shale gas well mining.