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:
Sep. 27, 2022
Filed:
Jan. 15, 2019
Japan Agency for Marine-earth Science and Technology, Yokosuka, JP;
Nustar Technologies Pte Ltd, Singapore, SG;
Tomokazu Saruhashi, Yokosuka, JP;
Ikuo Sawada, Yokosuka, JP;
Masanori Kyo, Yokosuka, JP;
Takahiro Yokoyama, Yokosuka, JP;
Noriaki Sakurai, Yokosuka, JP;
Ryan Bo Jia Wee, Singapore, SG;
Chamal Jayanath Seneviratne, Singapore, SG;
Kim Kok Goi, Singapore, SG;
Sim Guan Teo, Singapore, SG;
Japan Agency for Marine-Earth Science and Technology, Yokosuka, JP;
NuStar Technologies Pte Ltd, Singapore, SG;
Abstract
A lock plug (A) is inserted into a plug installation position of an insertion hole () of a tool stem () connected to a drill string (), and when a fluid has flowed to the insertion hole (), a stopper () protrudes radially outward from a tool body () and is locked to a subsea wellhead () and an internal stopper () protrudes radially inward from the tool body () and is locked to the tool stem () in a lock state. An unlock plug is inserted into the plug installation position of the insertion hole (), and when the fluid has flowed into the insertion hole (), the stopper () is separated from the subsea wellhead () and the internal stopper () is separated from the tool stem () to release the lock state.