Abstract
During the lifetime of an oil field, well integrity should be taken into account under the geomechanical perspective. This work shows the influence of geomechanical effects resulting from reservoir development over the integrity of a well, employing partially coupled fluid-mechanical simulations. This paper also presents a practical workflow, implemented in a GOCAD ambient as a plug-in, to perform the mesh building considering reservoir and adjacencies besides the data preprocessing for the geomechanical simulations. The submodeling technique was adopted to analyze the rock behavior around the well in a local model, and the casing response under the geomechanical effects observed in the global simulation. The well casing collapse was evaluated in the submodel by the von Mises criterion. The simulation results showed the importance of employing a rigorous fluid-mechanical methodology in well integrity analysis, once the stress states in the well region were fairly affected by the accounting of geomechanical effects, reflecting on the casing yielding onset. The developed tool for pre-processing and finite element mesh generation allowed to perform geomechanical analyses in a simple and intuitive way, allowing the employment of the coupling methodology in the routine of reservoir engineers.
