Abstract
The invention can be used to measure the rotational moment of inertia of drill bits around their center of rotation. The knowledge of the rotational moment of inertia of the bit is significantly important for the accurate prediction of the torsional eigenfrequencies (e.g. High-Frequency Torsional Oscillation (HFTO)) and mode shapes of the bottom hole assembly (BHA) and/or the drill string by simulation. Precise prediction of the torsional eigenfrequencies is for example required for optimal placement of HFTO-damper tools to efficiently mitigate HFTO. In addition, it is required for the estimation of critical torsional loads within the BHA (dynamic torque, tangential acceleration). This also supports tools for health-monitoring and predictive maintenance.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Baker Hughes Company, "Measurement of rotary bit inertia by trifilar pendulum method", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/8529