Assessing the Needs to Incorporate Completion Details in a PetroleumReservoir Simulation Model

摘要

Most of the current research and commercial reservoir simulators lack the capability to handle complex completiondetails like perforation tunnels in a simulation study. In most common applications, the simplified handling ofcompletion complexity in reservoir simulations is not expected to introduce significant error in simulation results. However,it has been found that under certain circumstances, especially in high rate wells that have become more and morecommon in deepwater oil and profilic gas development, exclusion of the complex completion details in a reservoir simulationmodel would lead to nontrivial errors. New equations have been proposed to assess the needs to incorporate completiondetails in a reservoir simulation study based on the understanding of the fluid flow in a formation, the fluid flowalong a wellbore and the fluid flow through perforation tunnels if exist. A series of sensitivity studies with different completionoptions under different flow and reservoir environments has been conducted to provide some guidance to improvewell performance prediction through reservoir simulation. Impacts of key parameters like perforation density, perforationdiameter, perforation length, wellbore length, borehole diameter, well completion configuration, well placement, reservoirpermeability, reservoir heterogeneity, pressure drawdown, etc, have also been investigated.