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:
Aug. 02, 2011
Filed:
Jun. 12, 2008
William Malcolm Calhoun, The Woodlands, TX (US);
Hector Ulpiano Caicedo, Houston, TX (US);
Russell Thomas Ewy, San Ramon, CA (US);
William Malcolm Calhoun, The Woodlands, TX (US);
Hector Ulpiano Caicedo, Houston, TX (US);
Russell Thomas Ewy, San Ramon, CA (US);
Chevron U.S.A. Inc., San Ramon, CA (US);
Abstract
A method for predicting the rate of penetration (ROP) of a drill bit drilling a well bore through intervals of rock of a subterranean formation is provided based on determined relationships between a bit-specific coefficient of sliding friction μ and mechanical efficiency EFFand confined compressive strength CCS over a range of confined compressive strengths CCS. Confined compressive strength CCS is estimated for intervals of rock through which the drill bit is to be used to drill a well bore. The rate of penetration ROP is then calculated utilizing the estimates of confined compressive strength CCS and those determined relationships.