Measuring and testing – Borehole or drilling – Downhole test
Patent
1986-08-28
1988-09-27
Levy, Stewart J.
Measuring and testing
Borehole or drilling
Downhole test
73659, 73660, 175 39, E21B 4500
Patent
active
047732636
ABSTRACT:
Information on tooth wear is obtained from the frequency distribution spectrum of a vibrational quantity influenced by the impact of cutter teeth on the bottom of a bore. For example, spectra may be obtained from the product of signals indicative of torque and torsional acceleration. Tooth wear is then indicated by the shift upwardly in frequency of peaks in the spectra. Other quantities which may be used, singly or together to enhance spectral information, are weight on bit, vertical acceleration, transverse acceleration, standpipe pressure. Abrupt changes in frequency distribution curves indicate abrupt occurrences such as broken teeth or stuck cones. A stuck cone is also indicated by unidirectional peaks in a plot of torsional acceleration against time.
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F. H. Deily et al., New Drilling-Research . . . Hole, Oil and Gas Journal, 1-8-68, pp. 55-64.
Lesage Marc
Sheppard Michael
Borst Stephen L.
Levy Stewart J.
O'Shea Kevin D.
Schlumberger Technology Corporation
Yawney Mary M.
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