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. 14, 1985
Filed:
Nov. 01, 1982
John S Childers, Greenville, TX (US);
Paul E Pastusek, Houston, TX (US);
Reed Rock Bit Company, Houston, TX (US);
Abstract
A rotary drill bit comprising a bit body having a chamber therein adapted to receive drilling fluid under pressure, a plurality of nozzles in communication with the chamber for exit of the drilling fluid, and a plurality of depending legs at its lower end, each having a bearing journal. The bit further includes a plurality of roller cutters, one for each leg, each cutter comprising a generally conical cutter body rotatably mounted on the bearing journal of the respective leg, and a plurality of cutting elements thereon. Each nozzle has an orifice in a position below the top of an adjacent roller cutter but above the central axis of the respective bearing journal at its inner end with respect to the bit body. In addition, each nozzle directs the fluid to flow in the direction opposite the direction of rotation of the bit, with the flow being generally tangent to the cutter body of the adjacent roller cutter, and thereafter impinging portions of the bottom of the well bore immediately forward of the adjacent roller cutter, whereby the drilling fluid cleans these portions of the well bore bottom and the cutting elements immediately prior to their engagement for enhanced drill bit cutting action.