| Title | Simulation Framework for Analyzing Fluid–Drill String Interactions in Geothermal Well Drilling Under Novel Conditions |
|---|---|
| Authors | D. Lastiwka, A. Leakos, P. Fisico, T. Miguens |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | |
| Abstract | Reducing the cost of geothermal energy ($/MWh) requires drilling under extreme and previously untested conditions, such as high temperatures and deep formations. Existing drilling analysis and planning tools lack the modeling capabilities to accurately simulate these new operational environments. In response, Eavor Technologies has developed a modular, low-fidelity simulation framework tailored for geothermal drilling under novel conditions and with unconventional materials and fluids. This framework integrates several numerical modules to model key aspects of the drilling process. A one-dimensional (1D) compressible fluid flow finite volume method (FVM) module simulates primary flow variables of the drilling mud. A two-dimensional (2D) axisymmetric thermal finite element analysis (FEA) module predicts temperature distributions within the drill string. Mechanical behavior is captured using a six degree of freedom (6-DOF) beam FEA module that computes stresses and strains in the drill string. Thermal coupling between the mud and drill string is achieved via a two-way interaction model, while fluid-structure force coupling is handled through a one-way approach based on pressure-induced loading. By employing low-fidelity modeling strategies, the simulation achieves real-time or faster-than-real-time performance, enabling the creation of a digital twin of the drilling process. This allows for continuous prediction and monitoring of thermal and mechanical states throughout the operation. The framework provides a powerful tool for planning and risk assessment in geothermal drilling projects that push the boundaries of current engineering capabilities. |