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:
Feb. 05, 1991
Filed:
Jul. 17, 1989
John D Deane, Houston, TX (US);
Craig R Ivie, Houston, TX (US);
Camco International Inc., Houston, TX (US);
Abstract
A rotary drill bit (10) has three roller cutters (20A, 20B and 29C) mounted thereon for rotation with a plurality of cutting elements (26) arranged in concentric annular rows (28A, 28B, 28C, 28D) thereon. A high velocity drilling fluid is discharged from nozzle orifices (40, 42, 52) and the orifices are sized and positioned so that more hydraulic energy is directed against the cutting elements (26) in the gage row (28D) than against the cutting elements (26) in the remaining rows (28A, 28B, 28C). The drilling fluid impinges the cutting elements (26) on the leading side of the roller cutters (20A, 20B, 20C) immediately prior to engagement of the cutting elements (26) with the bore hole bottom (30) and then sequentially strikes the bore hole bottom formation at or closely adjacent the juncture (35) of the horizontal bottom portion (32) with the vertical side portion (34).