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:
Feb. 13, 2018
Filed:
Jun. 28, 2017
China University of Petroleum (Beijing), Changping District, Beijing, CN;
Guancheng Jiang, Beijing, CN;
Chong Liu, Beijing, CN;
Yinbo He, Beijing, CN;
Qingying Ge, Beijing, CN;
Lili Yang, Beijing, CN;
Yong Wang, Shenyang, CN;
Fan Liu, Beijing, CN;
Yongqing Zhang, Beijing, CN;
Zhaohui Wang, Beijing, CN;
Jingdong Hu, Beijing, CN;
Lin Cheng, Beijing, CN;
Guangchang Ma, Beijing, CN;
Yong Qin, Beijing, CN;
Chunyao Peng, Beijing, CN;
Haifang Sun, Beijing, CN;
Deli Gao, 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 a drilling fluid additive composition and a water-based drilling fluid suitable for high pressure plugging while drilling. The composition contains a bridging agent, a nano-plugging agent, a rheological modifier, a bionic wall bracing agent, and a bionic shale inhibitor, wherein, the bridging agent is a weak-crosslinked copolymer, in which the content of cross-linker structures is 0.1-1 wt. %; the nano-plugging agent is modified nanometer silicon dioxide particles; the rheological modifier is a dimer acid-organic amine copolymer; and the bionic wall bracing agent is carboxymethyl chitosan with a dopamine-derived base group grafted on its main chain. With a synergistic effect among the bridging agent, the nano-plugging agent, the rheological modifier, the bionic wall bracing agent, and the bionic shale inhibitor in the composition provided in the present invention, the water-based drilling fluid containing the composition as additive can attains an excellent plugging effect in a drilling process.