Abstract
High Frequency Torsional Oscillation (HFTO) is a particularly damaging vibration that is induced during drilling of prone formations with PDC bits. Adding damping has been found to be a proper method to mitigate HFTO. There are different damping mechanisms available and patented. In reality the damping is amplitude dependent (modal amplitude of the HFTO amplitude). Some downhole vibration damper tools (HFTO damper) are extremely nonlinear and have a dedicated dependency between the damping and the amplitude. The required damping is a very important information. With the required damping the length or radial dimensions of a HFTO damper, for example an inertia based damper tool close to the bit, are determined. Length and radial dimensions directly correlate to the costs of a damper tool. On the other hand, for a HFTO damper, the number of damper elements (such as inertia elements) in the damper tool correlate to the OPEX costs and could be reduced or adjusted if the amount of needed damping would be known.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Baker Hughes Company, "Determine HFTO damper utilization through amplitude dependent damping mechanism", Technical Disclosure Commons, (April 03, 2025)
https://www.tdcommons.org/dpubs_series/7961