Towards an understanding of the drilling process for fossil fuel energy: A continuum-discrete approach

During the drilling process, drill operators constantly adjust drilling parameters depending on a number of geo-tribological factors. The optimization of these parameters is typically based on trial-and-error field data from previous wells. As a step toward elucidating some of the underlying physics which affect the drilling process, the current work introduces a continuum-discrete approach which has the potential to predict rock wear rates. This model predicts how changes in rock strength, drilling fluid viscosity, drill bit angular velocity, and weight-on-bit affect the rate-of-penetration. Predictions from the model show qualitative agreement with experimental findings and field data.

► An original modeling framework is presented to simulate rotary drilling.
► The model provides a qualitative prediction for rate-of-penetration.
► The model captures the effect of friction between the drill bit and the rock.
► The model simulates the debris removal from the cutting interface.