| Title | Generating Heat from Unused and Abandoned Wells with the Advanced/Enhanced Geothermal System Technology |
|---|---|
| Authors | Murat KARADAS, Mansur MUSTAFAOGLU, Seymur GULIYEV, Selim TUNA, Alptug GUR, Ilker KIRCA, Mustafa AKKOYUN, Ahmet KARABIYIK, Gulcan KARADAS |
| Year | 2023 |
| Conference | Stanford Geothermal Workshop |
| Keywords | enhanced geothermal system, advanced geothermal system, abandoned wells, unused wells, down hole heat exchanger, heat production, electricity generation, CFD, finite element method, closed loop. |
| Abstract | Geothermal resources are one of the leading renewable energy resources in terms of power and heat generation in the 21st century. Geothermal power plants convert underground thermal heat into electrical power. Due to cracks in rock structures, magma rises closer to the surfaces or due to high thermal conductivity of the rock layers temperatures of the rocks closer to the surface rises warmer than the average values. If water penetrates through cracks in rocks or porous rock structures, they will be warm enough to generate electrical power or heat generation. Warm geothermal water is extracted by drilling wells to earth crust. This type of systems where geothermal water resource is naturally existed are called conventional geothermal systems. In zones where hot dry rock is existed without water resources, it is still possible to generate power by sending water from outside to underground and reclaim heated water for heat and use it for power generation. This type of systems is called Advanced/Enhanced Geothermal Systems (AGS/EGS). Advanced/Enhanced Geothermal systems are currently being tested to obtain the temperature in the shallow depths of the wells that cannot be used by many developed countries of the world. Advanced/Enhanced Geothermal systems are an attractive possibility for the development of baseload, carbon-free electricity generation due to wider availability of such resources. However, generating electricity from AGS/ EGS requires a reasonable cost and further technological advances that will reduce installation costs and/or increase the rate of energy recovery. The technology of the first and deepest Advanced/Enhanced Geothermal System in Türkiye has been developed by Geo Energy Holding. Geo Energy Holding is improving its knowledge base on AGS/EGS and accelerating its efforts to generate electrical energy by further improving its experience in down-hole heat exchanger applications. In geothermal wells with shallow depths (2500 m and shallower), which are not suitable for production and injection, it is aimed to bring them into energy production with the Advanced/Enhanced Geothermal System method. To produce heat and electrical energy from these geothermal wells, optimal method was chosen among the open and closed systems of the deep well heat exchanger (DWHE). The theoretical calculations of the DWHE method and its practical application is introduced in this paper. |