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. 27, 2003
Filed:
Mar. 02, 2001
Gary M. Thigpen, Kingwood, TX (US);
Carl W. Keith, Houston, TX (US);
Varel International, Inc., Carrollton, TX (US);
Abstract
A drag type casing mill/drill bit for down hole milling of a casing window and lateral drilling of a bore hole in an earth formation comprises a bit body adapted to be rotated in a defined direction. The bit body includes an operating end face having a plurality of radially extending blades formed as a part of the operating end face of the bit body. A plurality of primary cutting elements are individually mounted in pockets in one of the plurality of blades. In addition, a plurality of secondary ridge structures are mounted to each of the plurality of blades interspersed with the plurality of primary cutting elements in a pattern such that as the bit body rotates the secondary ridge structures contact the casing or the earth formation thereby protecting the primary cutting elements and allowing continuous substantially smooth casing milling and earth formation drilling.