| Title | Kawah Kamojang pilotiInjection test: Production monitoring evaluation and numerical reservoir modelling study to support Kamojang injection optimization program |
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| Authors | F.H. Abdurachman, S. Hendriana, B.L. Riandari, P. Hastuti, F. Pasaribu |
| Year | 2023 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Kamojang, Pilot Injection Test, Reservoir Management, Injection Optimization, Production Monitoring, Reservoir Numerical Modelling |
| Abstract | Injection optimization strategy is an essential component of geothermal resource management, as it plays a pivotal role in ensuring the security of steam supply. Presently, Kamojang geothermal field continues to produce at full capacity at 235 MW from about 515 kg/s of steam production and giving an excess of 95 kg/s condensate to reinject. Condensate injection in the Kamojang field began in 1978, corresponding with the initiation of commercial production and to date the condensate injection strategy in the field is predominantly focused on the central area. Superheat, as a potential threat to the security of Kamojang steam supply, is periodically monitored using surface superheat measurements. The monitoring program has observed a steady rise in superheat levels since 2017, with the most notable increase in superheat reaching up to 10℃. This increase is particularly evident in wells located in the vicinity of Kawah Kamojang area in the northeastern part of Kamojang. Several initiatives are currently being undertaken to counter the propagation of superheat. One such initiative is the injection pilot test in Kawah Kamojang area. There are currently 6 production wells and 1 non-commercial well in Kawah Kamojang area. The sole inactive well, situated in the northernmost part of Kawah Kamojang was selected as the injector candidate where the pilot injection test was conducted over a duration of 2 months. A surveillance program was established to monitor the production of wells and the surface superheat in order to observe the responses of the reservoir to the pilot injection test. The collected data is used to evaluate the impact of injection changes on the reservoir. The numerical reservoir model of Kamojang was employed to demonstrate the substantial extension of the steam supply forecast following the pilot injection scenario and to help determine the next step in the Kamojang injection optimization program. |