Abstract
This paper presents a newly developed drillstring dynamics system designed to avoid resonance and to reduce vibrations. The system integrates real-time dynamics modeling with real-time downhole vibration data to provide accurate modeling results and data analyses. Unlike conventional BHA dynamics software that is run for well planning or post-run analysis, this system uses real-time data (e.g., WOB, inclination, DLS) to produce real-time updates of critical rotary speeds. The updates are then displayed along with the rotary speed to show if the rotary speed is too close to one of the predicted critical rotary speeds. In addition, the modeling results can be compared with actual real-time downhole vibration data to corroborate the actual downhole condition. This paper will show why real-time modeling is more accurate than the conventional stand-alone modeling. Field runs of the new system in the GOM have demonstrated the accuracy of modeling is critical in avoiding harmful vibrations.
