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. 14, 2021
Filed:
Oct. 31, 2020
Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, CN;
Southwest Petroleum University, Chengdu, CN;
Guorong Wang, Chengdu, CN;
Yang Tang, Chengdu, CN;
Xin Jing, Chengdu, CN;
Qingyou Liu, Chengdu, CN;
Shouwei Zhou, Chengdu, CN;
Xushen Li, Zhanjiang, CN;
Lin Zhong, Chengdu, CN;
Qingping Li, Zhanjiang, CN;
Yufa He, Zhanjiang, CN;
Zhong Li, Zhanjiang, CN;
Yanjun Li, Zhanjiang, CN;
Hexing Liu, Zhanjiang, CN;
Jianglin Zhu, Zhanjiang, CN;
Jiang Lu, Zhanjiang, CN;
Leizhen Wang, Chengdu, CN;
Abstract
The present invention relates to a combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation, including a joint, an outer cylinder connected to the joint by thread, a nozzle I mounted in the outer cylinder, a mechanical locking mechanism, a blade telescoping mechanism, an end cap connected to the outer cylinder by thread, a seal ring IV mounted to the end cap, and a nozzle II mounted in the end cap by threaded connection. The present invention achieves integrated operation of conventional drilling and draw-back expanding, which can effectively solve the problems that the existing hydrate drill bit cannot drill a large borehole, cannot mechanically lock an extending position of the blade to stabilize the size of the borehole, and a single crushing method is inefficient.