Contribution to well mechanical history modeling prior abandonment

摘要

Well abandonment is a key issue considering the long term integrity of CO2 storage sites. In this study, we model the mechanical status of a well prior its abandonment to identify any zone Of weakness that may affect the well integrity allowing unexpected fluids migration. We first state on wellbore stresses just after drilling and completion using a 2D reservoir model. Then, we model in 3D the stress evolution at wellbore considering pore pressure fluid variations. The final state of stress of each material is then compared to its failure envelop to assess the risk of having damaged materials.