Method of determining drill bit wear

Details Method of determining drill bit wear Method of determining drill bit wear

E - Fixed Constructions

21

B

349/35

E21B 12/02 (2006.01) E21B 44/00 (2006.01) G01H 1/00 (2006.01) G05B 19/4065 (2006.01)

Patent

CA 1298394

Abstract A method is provided for determining the state of wear of a multicone drill bit. Vibrations generated by the working drill bit are detected and converted into a time oscillatory signal from which a frequency spectrum is derived. The periodicity of the frequency spectrum is extracted. The rate of rotation of at least one cone is determined from said periodicity and the state of wear of the drill bit is derived from said rate of cone rotation. The oscillatory signal represents the variation in amplitude of the vertical or torsional force applied to the drill bit. To extract periodicity, a set of harmonics in the frequency spectrum is given prominence by computing the cepstrum of the frequency spectrum or by obtaining an harmonic-enhanced spectrum. The fundamental frequency in the set of harmonics is determined and the rate of cone rotation is derived from said fundamental frequency.

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