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• W2414405128 abstract "Since the geothermal industry began developing, numerous geothermal models have been published. The simulator FloWell, developed at the University of Iceland in 2012, is one of the latest addition to the bundle of geothermal models. FloWell is a wellbore simulator designed to model liquid, two-phase and superheated steam flows in geothermal wells. FloWell is considered a very simple simulator, user-friendly and computationally inexpensive. It has been coupled with the reservoir simulator TOUGH2 with good results and is now being incorporated into iTOUGH2 to enable direct use of wellhead production data for model calibration. In order to thrive in the fast developing industry and to stay up-to-date, it is vital that the development of FloWell is a continuous process. This paper discusses the enhancement and further verification of FloWell. During the initial development some general assumptions had to be made for simplification, such as simulations were restricted to wells with a single feedzone and for a single diameter value. In this paper the feasibility and implementation of adding these features to FloWell are discussed. Furthermore, a new interface of FloWell is introduced, improving the ease of use of the simulator. Lastly, an inverse analysis with iTOUGH2PEST is performed for parameter estimation in FloWell in order to assess which factors have the most impact during wellbore simulations. 1. INTRODUCTION Geothermal energy is classified as a renewable resource and has the potential of contributing greatly to sustainable energy use in many parts of the world. The energy is generated and stored in the Earth. The main source of the heat is the radioactive decay of unstable isotopes within the mantle and the crust and also some of the heat stored in the Earth is from the formation of the planet. Heat flows continuously from Earth's core to the surface, heating rocks and groundwater, and from the surface it is lost to the atmosphere. In terms of the human life time, the geothermal energy available is virtually inexhaustible, if used in a sensible manner (Carella, 2001). Monitoring the behavior of a geothermal reservoir and wells over time leads to a greater understanding of the resource's nature and allows extensive databases of geophysical parameters to be created. Mathematical models are developed on the basis of these databases. These numerical models are one of the most important tools in geothermal resource management. They can be used to extract information on the condition of geothermal systems, predict reservoir behavior and estimate production potential (Axelsson, 2003). With the growth of the geothermal industry, computer models of geothermal systems have become more sophisticated. The geothermal industry began accepting the concept of geothermal simulations in the 1980s. During that time, a great deal of pioneering work was published, but the lack of computer power forced the pioneers to simplify the geometry in their models so computational meshes could be created. As the computer power available increased more complex simulators emerged, producing more accurate results than their predecessors (O’Sullivan et al., 2001)." @default.
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• W2414405128 date "2015-01-01" @default.
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• W2414405128 title "The Wellbore Simulator FloWell - Model Enhancement and Verification" @default.
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