Modelling the dynamic behaviour of a complete drilling tool assembly

摘要

The dynamic behaviour of at least a drill bit and a section of drill string are determined using a numerical model. Interactions between the drill bit, drill string, rock formation, drilling fluid and the above surface assembly are all incorporated, allowing the method to be used to design and optimise drilling systems via an iterative approach. The model output may be converted into a visual representation of the drilling process. Parameters that can be simulated and used to measure drilling performance include the rate of penetration, weight on bit, rate of wear of bit and deviation from the desired drill path. The numerical calculations may be performed using a finite element model.