Advanced Drillstring Dynamics System Integrates Real-Time Modeling and Measurements

摘要

This paper presents a newly developed drillstring dynamicsrnsystem designed to avoid resonance and to reduce vibrations.rnThe system integrates real-time dynamics modeling with realtimerndownhole vibration data to provide accurate modelingrnresults and data analyses. Unlike conventional BHA dynamicsrnsoftware that is run for well planning or post-run analysis, thisrnsystem uses real-time data (e.g., WOB, inclination, DLS) tornproduce real-time updates of critical rotary speeds. Thernupdates are then displayed along with the rotary speed to showrnif the rotary speed is too close to one of the predicted criticalrnrotary speeds. In addition, the modeling results can berncompared with actual real-time downhole vibration data torncorroborate the actual downhole condition. This paper willrnshow why real-time modeling is more accurate than thernconventional stand-alone modeling. Field runs of the newrnsystem in the GOM have demonstrated the accuracy ofrnmodeling is critical in avoiding harmful vibrations.