Method of analyzing vibrations from a drilling bit in a borehole

Details Method of analyzing vibrations from a drilling bit in a borehole Method of analyzing vibrations from a drilling bit in a borehole

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.

REFERENCES:
patent: 2985829 (1961-05-01), Swift
patent: 3345867 (1967-10-01), Arps
patent: 3703096 (1972-11-01), Vitter, Jr. et al.
patent: 3714822 (1973-02-01), Lutz
patent: 3774445 (1973-11-01), Rundell
patent: 3782190 (1974-01-01), Pittman
patent: 4150568 (1979-04-01), Berger et al.
patent: 4549431 (1985-10-01), Soelinah
F. H. Deily et al., New Drilling-Research . . . Hole, Oil and Gas Journal, 1-8-68, pp. 55-64.

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