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:
May. 11, 2021
Filed:
Dec. 03, 2020
Applicant:
China University of Petroleum (East China), Qingdao, CN;
Inventors:
Zhiyuan Wang, Qingdao, CN;
Jianbo Zhang, Qingdao, CN;
Baojiang Sun, Qingdao, CN;
Wenqiang Lou, Qingdao, CN;
Xiaohui Sun, Qingdao, CN;
Zheng Liu, Qingdao, CN;
Shikun Tong, Qingdao, CN;
Assignee:
CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao, CN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 44/06 (2006.01); E21B 41/00 (2006.01); E21B 47/008 (2012.01); E21B 47/07 (2012.01); E21B 47/08 (2012.01); E21B 47/047 (2012.01);
U.S. Cl.
CPC ...
E21B 44/06 (2013.01); E21B 41/0099 (2020.05); E21B 47/008 (2020.05); E21B 47/047 (2020.05); E21B 47/07 (2020.05); E21B 47/08 (2013.01); E21B 2200/20 (2020.05);
Abstract
An active control method and system for wellbore pressure in open-cycle drilling in marine natural gas hydrates. The system comprises a drilling system, a drilling fluid injection system, and a data processing system for conducting the drilling operation.