Measuring and testing – Borehole or drilling – Downhole test
Patent
1984-12-27
1986-12-09
Levy, Stewart J.
Measuring and testing
Borehole or drilling
Downhole test
175 39, E21B 1200
Patent
active
046272763
ABSTRACT:
A method for measuring the wear of milled tooth bits during oilwell drilling uses surface and subsurface wellsite sensors to determine averaged values of penetration rate, rotation speed and MWD (measurements-while-drilling) values of torque and weight-on-bit to obtain a real time measurement of tooth wear, drilling efficiency and the in situ shear strength of the rock being drilled.
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T. M. Warren, Factors Affecting Torque for a Roller Cone Bit, Sep. 1984, pp. 1500-1508, "Journal of Petroleum Technology".
Burgess Trevor M.
Lesso, Jr. William G.
Levy Stewart J.
Raevis Robert R.
Schlumberger Technology Corporation
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