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. 23, 2000
Filed:
Mar. 25, 1998
Steven Taylor, Cheltenham, GB;
Camco International (UK) Limited, Stonehouse, GB;
Abstract
A drag-type drill bit for drilling holes in subsurface formations comprises a bit body having an end face and a shank for connection to a drill string, a number of blades upstanding from the end face of the bit body and extending outwardly away from the central axis of rotation of the bit, a number of cutters mounted on each blade, and a number of nozzles in the bit body for delivering drilling fluid for cooling and cleaning the cutters. The blades include primary blades which, at their outer ends, are spaced apart around aperipheral gauge portion of the bit, and secondary blades which are spaced circumferentially between adjacent primary blades, each secondary blade having an outer end which terminates at a location inwardly of the gauge portion of the bit. Each primary blade and associated secondary blade may be equivalent, in terms of their combined contribution to the cutting profile, to a single blade which extends continuously from the centre of the bit body to the gauge, but the separation of the blades facilitates the flow of drilling fluid over and between the blades. Also, the increased number of blades may enhance the stability of the drill bit and reduce vibration.