Drill string vibrations
The existence of substantial vibrations in the drillstring have caused much trouble time during drilling in slim (and conventional) holes. Minimising drillstring vibrations during the drilling of slim and conventional holes means that the dynamic components of the loads in the drillstring are reduced, with the following consequences:
- The peak loads can be reduced reducing twist-offs, etc.
- The cumulative fatigue loads are reduced, giving longer component life.
- The dynamic loads on the formation are reduced. These loads can contribute to borehole instability and washouts.
- The predictability . . .