Propose Model of Gathering System Optimization on Unit-G4 Geothermal Power Plant

Udi Harmoko (Department of Physics, Faculty of Sains and Mathematics, Diponegoro University, Semarang,)
Sorja Koesuma (Department of Physics, Sebelas Maret University, Surakarta,)
Joko Windarto (Department of Electrical Engineering, Faculty of Engineering, Diponegoro University, Semarang)
Asep Yusup Burhanudin (Master of Energy, Diponegoro University, Semarang,)

INDONESIAN JOURNAL OF APPLIED PHYSICS
Vol 15, No 1 (2025): April

The nature of geothermal heat is a decrease in pressure, temperature, and steam flow. Based on Exaquantum observation data, one of the geothermal power plants in West Java experienced a reduced steam supply for the Geothermal Power plant (GPP) Unit-G4, which decreased production capacity. This study aims to analyze the existing conditions and make models and simulations on the optimum Steam Gathering System (SGS) at GPP Unit-G4.  The stages in this research are modelling using Aspen Hysys software on the existing conditions of SGS as a basis for finding alternative optimum solutions. The second stage was to design a model and simulation by interconnecting the K-21X production well with the PL-X05 production.  Furthermore, the simulation of adding steam by 25%, 50%, 75%, and 100% in the interconnection process was carried out. Existing steam gathering modelling and simulation results show that the deviation between actual steam field parameters is ≤ 2% (can be used as a simulation baseline). The modelling and simulation results of adding steam from the K-21X production well to the PL-X05 production well are optimum at 100% and 75% steam addition. From the simulation, adding 25% and 50% steam cannot be applied because the net power does not reach the unit rate capacity of 60.856 MW.