Fluid flow in rocks and porous media is an important aspect of many geomechanical and geological applications, such as groundwater flow, oil and gas extraction, and CO₂ sequestration. Modelling fluid flow through porous media involves solving coupled partial differential equations that describe the interactions between fluid pressure and rock deformation. FEM, often combined with other numerical techniques, is used to simulate these processes, providing insights into permeability, porosity, and the effect of fluid pressure on rock stability. Understanding fluid flow behaviour is crucial for optimising extraction processes and ensuring the stability of geological formations.