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. 26, 2002
Filed:
Feb. 13, 2001
Harold Sreshta, Houston, TX (US);
Eric F. Drake, Galveston, TX (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
The present invention is a new method for forming a high density hard facing rod. The rod is particularly suitable for hardfacing downhole tools including both fixed cutter and rolling cutter drill bits, bias pads for downhole rotary steerable systems, and stabilizers, and for other types of tools requiring strong and wear resistant hardfacings. The method includes the steps of: preparing a powder mix comprising carbide and metal powders, a fugitive binder, and other additives to render a moldable rheology; forming the powder mix into a powder core encased with a metal sheath to form a core-sheath assembly; and isostatically compacting the core-sheath assembly to densify the core to at least 65% of theoretical density and mechanically attach the sheath. The core fugitive binder along with residual volatile constituents may be thermally removed with or without vacuum, reducing, or inert environment prior to weld application of the composite rod.