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Long-term completion performance is important for the economic development of any field. As fields are now developed in environments that are capital intensive and increasingly technically challenging, new technologies are required for optimization of the completion design. Stand-alone reservoir simulators lack the required detail on the completion side, while stand-alone wellbore simulators do not have the long-term reservoir performance information available. Even the new class of coupled wellbore/reservoir simulators often lack comprehensive completion design capabilities. We have developed a fully-coupled black-oil wellbore/reservoir model which accounts for the necessary details for an optimized completion design. Specifically, the model couples ExxonMobil's proprietary reservoir simulator and a detailed completion hydraulics simulator such that the reservoir flow, wellbore tubing and annulus flows, and pressure fields are simulated simultaneously. In this paper, we compare different synthetic cases involving open-holes, pre-drilled liners, packers, and inflow control devices that demonstrate unique completion opportunities captured by using our modeling capabilities. We show that our model provides not only detailed information regarding the tubing and annulus flow and the associated pressure drops along the completion, but also the impact of different completion types on short- and long-term reservoir recovery. Our results show the significance of this new coupled approach in its ability to relate the reservoir performance and the flow dynamics through various completion types. |
