Method of analyzing vibrations from a drilling bit in a...

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

E - Fixed Constructions

21

B

340/124, 354/26

E21B 44/00 (2006.01) E21B 12/02 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1253231

ABSTRACT (Fig 2) METHOD OF ANALYZING VIBRATIONS FROM A DRILLING BIT IN A BOREHOLE Information on tooth wear is obtained from the frequency distribution spectrum of a vibrational quantity influenced by the impact of cutter teeth onthe bottom of a bore. In the illustrated example spectra are obtained from the product of torque and torsional acceleration and tooth wear is indicated by the shift upwardly in frequency of a pronounced peak occurring at T1 for a one eighth worn bit and at T5 for a five eighths worn bit. Other quantities which may be used, singly or together to enhance spectral inforamtion, 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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