Simulation of geothermal reservoirs with high amount of carbon dioxide

Download
index.pdf
2018
Küçük, Serhat
Show full item record
381
views
212
downloads
Geothermal energy is always attributed as a sustainable and environmentally friendly source of energy. But in some cases, amount of the greenhouse gas emissions from geothermal fields become a big issue. Kızıldere Geothermal Field, one of the most important and large scale geothermal fields of the world, is a subject of these issues, experiencing excess amount of CO2 production rates and a rapid decline in the reservoir pressures. This study aims to construct a numerical model of the Kızıldere Geothermal Field and predict the consequences of potential/possible future operations. Petrasim interface is used for the creation and the visualization of the model, as well as preparation of the simulation input files. EOS2 fluid property module of TOUGH2 simulation codes is used for the numerical simulation of the geothermal model. The natural state model of the field is obtained by running the simulation for a long time until the reservoir parameters are reached to stabilized conditions. In order to test the model, static pressure and temperature data of 53 wells, as well as dynamic pressure data of 15 observation wells are matched with the simulation results, within an error range of 10%, and the model is validated with a great accuracy. Based on the validated model, different reinjection scenarios under two different strategies are carried out. In the first strategy, production rates are kept constant in exchange for the wellhead pressures, while wellhead pressures are kept constant by adjusting the production rates in the second strategy. The results of different scenarios show that the current reinjection plan of the field restricts to have higher impacts on the reservoir pressures by higher reinjection rates. Results also show that Kızıldere Geothermal Field can be used as a sink for greenhouse gases (especially CO2), which have positive effects on the reservoir management purposes beside the environmental benefits.
Geothermal engineering., Geothermal resources., Carbon dioxide.
http://etd.lib.metu.edu.tr/upload/12622772/index.pdf
https://hdl.handle.net/11511/27684
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Geochemical modeling of NCG injection in a geothermal well using doublet well model
İlgin, Buğrahan; Akın, Serhat; Erol, Selçuk; Department of Petroleum and Natural Gas Engineering (2021-7-29)
Geothermal energy is regarded as an environmentally friendly source of energy. However, the amount of non-condensable gases (NCG), which are co-produced with brine, are significantly high in the geothermal fields of Turkey. To overcome the NCG emission produced by power plants, which is mainly CO2, one of the efficient methods is re-injecting the captured NCG into the reservoir. The ultimate aim of the reinjection is to mineralize CO2 in the reservoir as carbonate minerals. In this thesis, a reactive transp...
Evaluation of geothermal potential of Turkey using GIS based multi criteria analysis
Öztürk, Şafak; Kaymakcı, Nuretdin; Department of Geological Engineering (2019)
Geothermal energy could meet more than the world’s energy need. However, a very small amount of this energy is utilized by humanity, due to drilling and exploration costs for deep resources. Therefore, prospective studies have great importance in order to reduce the cost for exploration and utilization of geothermal energy. In this study Geographic Information System (GIS) based geothermal assessment techniques are used to determine the promising areas in Turkey. GIS is a combination of three features; oper...
Design of Electrical Submersible Pump system in geothermal wells: A case study from West Anatolia, Turkey
Aydın, Hakkı; Merey, Şükrü (Elsevier BV, 2021-5-12)
Geothermal is defined as one of the renewable and sustainable energy sources. The sustainability of geothermal wells is highly dependent on the pressure drive mechanism and non-condensable gas (NCG) content of the produced geothermal fluid. Pressure decline and decline of non-condensable gases are commonly observed in geothermal production wells, which is unfavorable for wells’ lifetime. Electrical Submersible Pumps (ESP) are one of the solutions for extending the lifetime of geothermal wells. In this study...
Numerical modeling of Edremit geothermal field
Günay, Emre; Karahanoğlu, Nurkan; Department of Geological Engineering (2012)
The purpose of this study is to examine the geothermal potential, sustainability, and reinjection possibility of Edremit geothermal field. In order to investigate this, a numerical model consisting of a hot and cold water aquifer system is established. A two dimensional cross sectional model is set to simulate this geothermal system. Different pressure and temperature values are applied to the nodes at the boundaries to perform a steady state calibration which minimizes the computed results and observed val...
Application of non-market economic valuation method to value the environmental benefits of geothermal energy in monetary terms
Horasanlı, Erol; Alp, Emre; Department of Environmental Engineering (2010)
Determining environmental economic benefits of geothermal energy is difficult since there is no market for all environmental goods and services related to it. In order to determine and measure the market price of non-market goods and services, non-market valuation methods are used. Since intangible benefits do not have monetary values, non-market valuation techniques are applied to estimate them. Non-market valuation methods are important tools for policy makers in the cost and benefit analysis and environm...
Citation Formats
S. Küçük, “Simulation of geothermal reservoirs with high amount of carbon dioxide,” M.S. - Master of Science, Middle East Technical University, 2018.
METU IIS - Integrated Information Service open@metu.edu.tr