Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2011-08-02
2011-08-02
Nghiem, Michael P (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C073S152440
Reexamination Certificate
active
07991554
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 EFFMand 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.
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Caicedo Hector Ulpiano
Calhoun William Malcolm
Ewy Russell Thomas
Chevron U.S.A. Inc.
Le Toan M
Merchant & Gould
Nghiem Michael P
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