LEE- Petrol ve Doğal Gaz Mühendisliği-Doktora

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http://hdl.handle.net/11527/19424

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    Identifying the locations of observation wells for various boundary conditions for geothermal reservoirs
    (Lisansüstü Eğitim Enstitüsü, 2021) Öztürk, Ufuk ; Türeyen, Ömer İnanç ; 709853 ; Petrol ve Doğal Gaz Mühendisliği
    In the last two decades, the importance of renewable energy sources has increased due to global warming and environmental concerns. Having suitable geological conditions, Turkey's geothermal potential is high. In the last sixteen years, with new investments, the installed geothermal capacity of Turkey greatly increased. In the near future, geothermal energy can contribute more to the domestic energy needs and could be an important alternative energy resource for our country. In geothermal projects, optimum reservoir management is one of the most important aspects of sustainable production. It affects the project's economy and the sustainability of the resources. In order to manage the reservoir optimally, future predictions have to be made by using reservoir simulation techniques. In reservoir simulation, the volumetric average reservoir pressure is one of the most important data that can be obtained from the reservoir. One can use well tests or observation wells to determine the volumetric average reservoir pressure. This study aims to contribute to answering the best possible location for the observation well that represents the average reservoir pressure. The pressures observed from the observation well can then be used for reservoir engineering practices. In case the observation well location does not represent the average reservoir pressure behavior, reservoir engineering practices may lead to unreliable future performance predictions. Thus, placing an observation well at a place where actual volumetric average reservoir pressure can be recorded is crucial for the economic development of the geothermal reservoir. In this thesis, a numerical work is conducted to study the proper location of an observation well to be selected for different boundary conditions and various well configurations. In all examples a square-shaped reservoir is assumed and no-flow or constant pressure outer boundaries are used. The cases studied usually have either one production or reinjection well or a pair of them. Even though the results obtained in the studied cases show results from a single well or a pair of wells, they can be used to generalize to production and reinjection regions in a field. A production well can represent a production region (where all or most of the production wells in the system are located) or an injection well might represent an injection region. The results of this study provide decision maps for various boundary and well configurations from which the engineer may be able to determine qualitatively where to place the observation well. It is determined that in the case where there is a high reinjection ratio (most of the produced fluid is reinjected back into the reservoir) the effects of the outer boundary on the location of the observation well becomes negligible. The location of the observation well in such cases depends mostly on the configuration of how the production and reinjection wells are placed. Furthermore, it should also be noted that the location of an observation well may change depending on how the locations of production and reinjection wells change over time, and also on the production and reinjection amounts. It is important to note that the results obtained from this study should be interpreted qualitatively. A study that provides the proper locations of an observation well does not exist in the geothermal engineering literature. The original contribution of this study is to fill this gap which could be very important.