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:
Mar. 24, 2015
Filed:
Jan. 12, 2013
Ying Xin Yang, Chengdu, CN;
Lian Chen, Chengdu, CN;
Min Lin, Chengdu, CN;
Zhu Pei, Chengdu, CN;
Hai Tao Ren, Chengdu, CN;
Ying Xin Yang, Chengdu, CN;
Lian Chen, Chengdu, CN;
Min Lin, Chengdu, CN;
Zhu Pei, Chengdu, CN;
Hai Tao Ren, Chengdu, CN;
Southwest Petroleum University, Chengdu, Sichuan, CN;
Abstract
A composite drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body (1) with at least one bit leg (3), at least one scraping-wheel (2) set with a cutter-row (4), and a set of cutters fixed thereon. The scraping-wheel (2) is mounted for rotation on the corresponding bit leg (3) with a large angular deflection α in the range of 20°≦|α|≦90°. The cutters on the scraping-wheel break rock by means of successive scraping, forming a cross-cutting area on the bottomhole accompanied by the cutters on the fixed cutting unit, thus achieving high rock-breaking efficiency, even wear, high cooling performance, and a longer service life for the cutters, bearings and the drill bit.