Advanced Drilling Dynamics Sensor Allows Real-Time Drilling Optimization, Damage Prevention and Condition Monitoring of RSS and LWD BHAs

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Abstract
This paper outlines the development and field deployment of the latest drilling dynamics sensor and validation of two preventative maintenance algorithms. The papers prime focus is torsional dynamics and the insight gained through the application of a novel angular rate gyro. The unique abilities of this sensor to measure angular rotation rate are used to characterize four distinct modes of torsional vibration. Downhole data is also shown which proves instantaneous reverse rotation of the bit against the rock face can occur when severe high frequency torsional vibration is present. The paper validates a new metric dedicated to detecting high frequency torsional dynamics. This metric, when used in combination with a unique Torsional Dynamics Indicator and downhole frequency analysis measurement, allows real-time determination of the mode and damaging nature of all types of torsional vibration. This knowledge is vital in order for appropriate mitigation strategies to be followed and for downhole tool damage to be understood. Preventative maintenance schemes for vibration and hole curvature are discussed and case studies show how these objective metrics can be used to track downhole conditions to (1) determine when downhole conditions exceed recommended guidelines, (2) investigate the effectiveness of vibration mitigation strategies and (3) objectively quantify differences in the downhole drilling environment.

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