This paper describes a coupled model between the reservoir simulator TOUGH2 and wellbore simulator GWELL. The goal is to provide increased capability in TOUGH2 to better model flow in geothermal systems containing wells with multiple feedzones. The model accounts for flow entering the wellbore from multiple feedzones at different depths and rock properties, with the fluid in different thermodynamic states.

As a result this approach facilitates a more accurate simulation of behavior of the geothermal reservoir being exploited. In addition, the input allows mesh refinement around the well using concentric rings of cells between the primary TOUGH2 cells and the wellbore model. The standard TOUGH2 input data is extended to support the new capability. Some sample problems are solved using coupled simulator and compared with the results obtained from the current deliverability model in TOUGH2.

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