| Title | Potential Closed-loop Geothermal Power Generation Application for Non-commercial Well in Indonesia: A Preliminary Study |
|---|---|
| Authors | Daniel ADITYATAMA, M. Rizqi Al ASYARI, Azaria Haykal AHMAD, Dorman PURBA, Vicky Rai CHANDRA, Nadya ERICHATAMA |
| Year | 2023 |
| Conference | Stanford Geothermal Workshop |
| Keywords | unconventional, closed loop, geothermal, Indonesia, power generation, retrofit |
| Abstract | The current conventional geothermal power generation typically involves the extraction of geothermal fluid from the subsurface to the production facility on the surface. Therefore, a commercial geothermal production well needs to encounter high enough temperature, benign fluid, and sufficient permeability to allow the geothermal fluid to flow. However, sometimes the wells drilled may not find all those three criteria, e.g., high bottom-hole temperature but tight permeability. Such wells are often considered non-commercial wells, as they often cannot be used for the injection well. The closed-loop geothermal concept offers a solution to utilize such a well by extracting the heat only from the wellbore. It introduces external fluid flowing through a downhole heat exchanger to extract the heat to the surface, where the heat is converted into electricity. Apart from non-commercial well utilization, a closed-loop geothermal concept is touted to extract heat from hot dry rock (HDR) system, conventional two-phase or vapour dominated well, and declined geothermal system. This study provides an overview of closed-loop geothermal power generation, the types of closed-loop system and their associated technology, and their advantages and challenges. The potential application of a closed-loop geothermal system in Indonesia is assessed by a preliminary analysis of several non-commercial wells with high temperatures. The design concept, consideration, and challenges in technology and geothermal resources are also presented. This study is expected to provide a preliminary study of future potential closed-loop geothermal applications in Indonesia. |