Numerical Investigative Modeling of Changes Within the Patuha Geothermal Reservoir and Its Production Sustainability Und
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Original Paper
Numerical Investigative Modeling of Changes Within the Patuha Geothermal Reservoir and Its Production Sustainability Under Two Different Conversion Technologies Heru Berian Pratama ,1,2,4 Sutopo,1,2 Jonathan Sharon Widiatmo,1 and Ali Ashat1,3 Received 29 November 2019; accepted 5 September 2020
An integrated numerical modeling of reservoir and power plant thermodynamics is proposed to assess the Patuha geothermal field development strategy. Power plant technologies, namely as dry-steam cycle unit (DSCU) and integrated geothermal combined-cycle unit (IGCCU), were selected for field development strategy options. TOUGH2 was used to simulate the effects of these technologies on reservoir production sustainability. The selection of power plant technology and field production strategy clearly affects the performance of the reservoir. The simulation results show that the IGCCU is less sustainable if hot fluid is produced only from the steam zone. However, the energy extraction from the brine zone is proven advantageous to maintain the steam zone pressure. In addition, higher injection rates into the brine zone from IGCCU power plant can yield to higher electrical power generation than DSCU. KEY WORDS: Reservoir model, Power plant thermodynamic model, Dry-steam cycle, Integrated combined cycle, Sustainability, Patuha geothermal field.
INTRODUCTION The Patuha geothermal field is located in Bandung and Cianjur Districts, West Java Province, Indonesia. The field is operated by PT Geo Dipa Energi (GDE) and it has been generating 55 MW of electricity since 2014. Raharjo et al. (2016) said that Patuha is a volcano-hosted vapor geothermal systems along with Karaha Talaga-Bodas (Nemcˇok 1
Geothermal Engineering MasterÕs Program, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia. 2 Geothermal Engineering Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia. 3 Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan. 4 To whom correspondence should be addressed; e-mail: [email protected]
et al. 2007; Prabata et al. 2019; Sutopo et al. 2019), Wayang Windu (Bogie et al. 2008), Kamojang (Suryadarma et al. 2010) and Darajat (Intani et al. 2020) in West Java, Indonesia. However, Layman and Soemarinda (2003) and Elfina (2017) stated that Patuha is divided into two zones with a 220–260 °C productive reservoir. The Patuha Geothermal System consists of three reservoirs associated with the area of Kawah Putih, Kawah Ciwidey, and Kawah Cibuni (Ashat et al. 2019a). The Patuha is a vapordominated reservoir with a steam zone above the deep liquid reservoir. Therefore, it is a unique type of reservoir since both reservoirs (steam and liquid) exist simultaneously. Most of the production wells are in the steam zone, but several wells also hit the liquid zone. The fact that is steam zone and brine reservoirs exist simultaneous
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