Mathematical modelling of geothermal carbon dioxide production in a specific field in Turkey.

Kumsal, Beril
Turkey’s non-condensable gases production from geothermal fields is very high when compared to other countries’ average production values. A big predominance of these gases is generally carbon dioxide (CO2) and the origin of this CO2 is generally meteoric for the studied area as reservoir rocks are carbonate-dominated metamorphic rocks such as dolomitic marbles and marbles.The dissolution of calcite mineral within the reservoir rocks, where it equilibrates with water, results in CO2 release from the system. And this release occurs because of meteoric waters. When a field is put on production, a CO2 decline is observed during the production life time and this decline can be addressed in three different scenarios. First, re-injected brine does not include any CO2 as it is released to the atmosphere after production. When this brine reaches to the production wells due to the strong hydraulic connectivity, a sharp CO2 decline occurs in the reservoir. Second, there might be a weak hydraulic connectivity between the production and re-injection wells and a gradual CO2 decline may be observed with time due to the natural recharging. Last, a CO2 decline may occur as a result of a sharp pressure decline in an excessively producing well because of the water invasion that comes from the upper part/shallow part of the geothermal system and this sub-surface water has less amount of dissolved CO2 in it. This study aims to clarify modelling of CO2 declines for an Alaşehir geothermal field. It has been observed that CO2 declines show the best matches with the hyperbolic decline method introduced by Arp’s in 1945. In this study, the reasons of the observed declines in Alaşehir geothermal field showed that a strong hydraulic connectivity between the re-injection and production wells resulted in a sharp CO2decline. On the contrary, a gradual CO2 decline has been observed when there is a weak hydraulic connectivity between the wells.


Investigation of Large Scale Slope Failure Mechanisms and Numerical Modeling for the Safe Design of Slopes in a Lignite Mine
Tutluoglu, LEVEND; Karpuz, Celal (2008-07-24)
With about 9.3 billion tons of reserve, lignite is a major source for energy production in Turkey. Turkish Coal Enterprises (TKI) produces about 60% of the yearly lignite production capacity. Can Surface Lignite Mine which is planned to produce approximately 2.5 million tons of 3000 kcal/kg coal, will be one of the main production areas of TKI. Possibility of large scale slope failures and their negative effects on mining operations in large Can Lignite Surface Mine on the northwestern Turkey were the major...
Modelling of in situ combustion for Turkish heavy crude oil fields
Kök, Mustafa Verşan (1995-01-01)
Different models were used to determine the possibility of in situ combustion applications for heavy crude oil fields in south-east Turkey. In the first approach a one-dimensional model was developed, in which the frontal advance concept is combined with mass and energy balance equations with certain boundary conditions, limitations and assumptions. The recovery histories of three oil fields were determined; the highest recovery was obtained in field 2 with dry combustion and in field 1 with wet combustion,...
Safety assessment of limestone-based engineering structures to be partially flooded by dam water: A case study from northeastern Turkey
GÖKÇEOĞLU, CANDAN; Türer, Ahmet; Nefeslioglu, H. A.; TÜRER, DİLEK; Akgül, Çağla (2016-07-15)
Turkey has been faced with an escalating energy demand and recurring droughts within the last few decades. The construction of the BAGISTAS 1 Hydroelectric Power Plant Dam, one of the dams constructed in order to solve these problems, resulted in the partial submersion of a number of pre-existing railway bridges and retaining walls of the Divrigi-Ilic-Erzincan Railway System (NE Turkey). Before the accumulation of dam water, the structural safety of these 86-year-old infrastructures, which were constructed ...
Türkiye'deki Jeotermal Bölge Isıtma Sistemlerinin Gelişimi
Parlaktuna, Mahmut; Parlaktuna, Burak (2021-07-06)
Turkey is one of the few countries that has almost all possible applications of geothermal energy. Geothermal district heating has a relatively short history (since 1987) compared to other direct utilization but plays important economic, social and environmental roles in some towns. There are 18 geothermal district heating systems (GDHS), mainly in the Aegean region with resource temperatures between 57–145C. Current heating capacities of those systems are in the range of 570 to 37500 Residence Equivalent ...
Numerical analysis of deep twin excavations and boreholes for heavy oil production
Emci, M.E.; Öztürk, Hasan (2021-09-06)
© Published under licence by IOP Publishing Ltd.One of the plans for the production of Turkey's largest oil reserve, Bati Raman (1.85 billion barrels), is to use Mining-Assisted Heavy Oil Production (MAHOP). In this method, twin declines are excavated from the surface to the reservoir and a series of excavations (galleries) continue along the bottom of the reservoir. Fan-shaped steam injection and production holes are drilled in the reservoir from the crown of the galleries to use conventional Steam-Assiste...
Citation Formats
B. Kumsal, “Mathematical modelling of geothermal carbon dioxide production in a specific field in Turkey.,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Petroleum and Natural Gas Engineering., Middle East Technical University, 2020.