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Analysis of drillstring dynamics using an angular rate sensor

  • US 10,480,304 B2
  • Filed: 10/12/2012
  • Issued: 11/19/2019
  • Est. Priority Date: 10/14/2011
  • Status: Expired due to Fees
First Claim
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1. A downhole drilling vibration analysis method, comprising:

  • drilling a borehole with a drilling assembly having at least one angular rate sensor;

    determining angular positions of the drilling assembly about a circumference of the borehole while drilling downhole;

    measuring instantaneous angular rates of the drilling assembly with the at least one angular rate sensor while drilling downhole;

    analyzing changes of the measured instantaneous angular rates occurring at least at a plurality of the determined angular positions of the drilling assembly about the circumference of the borehole by determining, at which of the angular positions of the drilling assembly about the circumference of the borehole, decrease in the instantaneous angular rates occurs, the decrease being indicative of a sticking of the drilling assembly at the determined angular position; and

    determining that torsional vibration is occurring during drilling based on the analysis.

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