Method of determining drill bit wear

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

1989-03-27

1990-05-29

Tokar, Michael J.

Measuring and testing

Borehole or drilling

Downhole test

175 39, E21B 4700

Patent

active

049285211

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 the periodicity and the state of wear of the drill bit is derived from the 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 the fundamental frequency.

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SPE Paper No. 16660-"The Effects of Quasi-Random Drill Bit Vibrations Upon Drillstring Dynamic Behavior", by E. Skaugen, Sep. 27-30, 1987, Dallas TX.

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