A Modified Non- Isothermal Lumped Parameter Model in Porous Media for Geothermal Reservoirs

Abstract

Abstract This paper presents a method to predict geothermal performance along production life using a lumped parameter model that has considered mass balance, heat changes, and porous media flow in geothermal reservoirs. Furthermore, the lumped model provides more information on the characteristics of geothermal reservoirs. This paper focuses on developed and combined Satman’s model on mass balance and Schilthuis’s model on material balance for oil reservoirs. This paper can calculate heat and mass balance for the non-isothermal condition with pressure and temperature changes, unlike previously published papers. Besides, this paper also includes Darcy’s equation to change the “tank” concept of lumped to be porous media as an actual reservoir condition. Thus the production mass rate can be calculated. The model developed can be used for performing history matching, “quick count’ of numerical simulation due to there is calculation well by well, if those combined, can determine an entire reservoir with a simple calculation. On the other hand, this method reduces the complexity of numerical calculation. Therefore, new lumped is expected to be an alternative for application in geothermal reservoirs.