Uncertainty Assessment in Well Productivity Loss due to Formation Damage

Abstract

Uncertainties in productivity loss due to drilling induced formation damage are studied using a near-wellbore numerical simulator, which integrates laboratory data on formation damage testing. To quantify these uncertainties, experimental designs combined with the Response Surface Methodology are used to assess the impact of uncertain parameters on formation damage. This approach allows to identify the most influential parameters on well productivity loss and to estimate the risks of formation damage. A good control of the most sensitive parameters can limit productivity loss. This approach provides key recommendations for the selection of drilling fluid to maximize well performance.