Analyzing and forecasting the performance of water drive gas reservoirs

Abstract

The manner of estimating water drive gas reservoir recovery can vary considerably. Several mathematical models have been developed for estimating water influx in petroleum industry, but the current paper will address the application of Fetkovich aquifer model to predict the gas reservoir performance considering the pressure changes that gradually occur within the aquifer and between the aquifer and reservoir. The applicability of this model has proven to be extremely useful in estimation of initial gas resources, aquifer volume and its parameters, confirming the producing mechanism but also forecasting the production performance of the gas reservoir. The authors will highlight through some case studies, the importance of the water influx analysis and prediction, in particular for natural gas reservoirs, which subsequently allows for adequate planning in optimizing the reserves' recovery.

Archives of Mining Sciences

“…Because natural gas extraction is a highly complex process, there is a need to develop calculation algorithms which use more or less advanced mathematical models. The aim is to properly evaluate reservoir parameters and credibly forecast further production [4,5]. reservoir-drive mechanisms have to be considered as a fundamental part of the algorithms, including not only the primary gas drive mechanism but also some more complex ones connected with the changes in pore volume resulting from the influx of water into the reservoir [6,7].…”