| Title | Kamojang Geothermal Field: 10 Year Operation Experience |
|---|---|
| Authors | S. Sudarman, M. Boedihardi, Kris Pudyastuti and Bardan |
| Year | 1995 |
| Conference | World Geothermal Congress |
| Keywords | Kamojang geothermal field, operation experience, Indonesia |
| Abstract | The vapor dominated Kamojang geothermal field is located about 35 km south of Bandung, the capital city of west Jawa province. This first Indonesian geothermal field has been operated since 1983 and currently producing 140 The geothermal system is associated with Quaternary volcanic centres of about years old and appears to occupy the graben like structure. The reservoir has low gas content of less than 1 by weight and porosity of order 4-7% which is found at an average depth of 1200 m below the ground level. The field size is estimated to be about 21 with a potential of about 300 Up to the end of wells have been drilled within an area of 14 providing a total proven potential of 200 A total steam output of 1125 produced from 24 production wells with three makeup wells and three reinjection wells placed in the centre part of the reservoir is currently used to generate 140 capacity. Well output performance monitored during a ten year production period indicate an annual decline rate of approximately 3% which is considered low suggesting that the reinjection strategy is likely to be well decided. Three Mitsubishi turbine units used indicate high efficiency with an average capacity and load factors of 85% and 97.5% respectively during 10 year production period, eventhough the field faces a silica deposition problem. The total field installed capacity will be raised from 140 to 220 with the Kamojang extension area which is expected to be on line in 1997. This additional capacity will be supplied from wells with standard and big hole well completion of 10 3/4 inch liner. Well bore simulation studies shows that wells with this size are capable of producing steam of approximately twice greater that of standard size wells. |