Integration of a 3D Finite Element Geomechanics Model and Particle Accumulation and Bridging Criteria for Production and Flow Blockage Assessment

ABSTRACT: The study aims to develop an innovative geomechanics model capable of predicting wellbore failure and its impact on reservoir production, addressing the need for accurate assessments of blockage risks throughout a well's lifecycle. An advanced three-dimensional finite element model (FEM) is employed, incorporating elasto-plastic behavior and a novel algorithm for calculating the volume of failed rock. This model integrates historical production data, well loading variations, and drilling-induced changes in wellbore geometry to evaluate the likelihood of rock failure. The geomechanics model is combined with particle accumulation and bridging criteria to ascertain the conditions leading to production blockage. The model successfully predicts the conditions under which wellbore failure may occur and identifies critical thresholds for the accumulation of debris that could obstruct fluid flow. Findings indicate that wellbore failure and subsequent particle accumulation significantly depend on the cumulative effects of operational variables, such as mud weight and cyclic loading. This study introduces a state-of-the-art numerical approach that bridges the gap between geomechanical analysis and production impact assessment. The integration of FEM with particle bridging criteria constitutes a substantial advancement in forecasting and mitigating wellbore failure risks. The integrated methodology proposed by this research offers a comprehensive tool for risk assessment and decision-making regarding well completions and interventions. By providing a detailed understanding of wellbore failure mechanisms and their consequences, this approach enables the optimization of production strategies and the proactive management of well integrity, ensuring sustained reservoir access and preventing costly downtimes. Introduction Wellbore failure represents a significant risk to reservoir accessibility and producibility throughout the lifecycle of a well. Production of reservoir fluids can cause timedependent failure, leading to the disintegration of wellbore rock fragments and their flow with the reservoir fluid to the surface. These rock fragments can have severe abrasive effects on surface pipelines and production facilities. In more severe cases, the failed rock fragments and particles can accumulate downhole, blocking the flow pathway and essentially ceasing production. (Skelton et al., 1995). This negative phenomenon can be exacerbated by one or both of the following drilling-related scenarios: