Analyzing toolface velocity to detect detrimental vibration...

Details Analyzing toolface velocity to detect detrimental vibration... Analyzing toolface velocity to detect detrimental vibration...

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 7/00 (2006.01) E21B 12/00 (2006.01)

Patent

CA 2725976

A downhole drilling vibration analysis involves measuring orientation data in at least two orthogonal axes downhole while drilling with a drilling assembly. For example, two orthogonal magnetometers can be used. A toolface of the drilling assembly is determined using the measured sensor data, and velocity (RPM) values for the toolface for a plurality of revolutions of the drilling assembly are determined. From these determined values, a coefficient of variation for the toolface velocity (RPM) values for the revolutions of the drilling assembly is calculated. When a pattern in found in the toolface velocity (RPM) and/or the calculated coefficient of variations exceed one or more thresholds, the processing device determines that detrimental vibrations are occurring in the drilling assembly.

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