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This paper presents an alternative form of IPR, called in this study “Gas Dynamic IPR” (GDIPR), and compares it with the performance of conventional Inflow Performance Relationships (IPR) for gas reservoirs. The main objective of the GDIPR is to provide a simple but robust IPR solution for gas wells under transient conditions for the early and late life of gas reservoirs. Conventional IPR models are often not able to capture transient effects for the late life of gas reservoirs. The GDIPR solution, on the other hand, can be used for the cases of buildup and drawdown tests (early life), and for the modeling of transient liquid loading phenomena in gas wells (late life). The GDIPR is compared to conventional IPR models in two case studies. The comparison analysis show that the conventional IPR models do not provide reliable results, while the GDIPR is in agreement with the solution from discretized reservoir models. The GDIPR technique is computationally less expensive than discretized reservoir models, and is able to capture both the transient well behavior and the steady-state solution, for early and late life of gas reservoirs. |
