| Abstract |
There are five in the world of unique and complex vapor dominated system, mainly one in the Geyser (U.S.A.), Lardarllelo (Italy), Matsukawa (Japan) and two Kamojang and Derajat in Indonesia. History or future performance of steam production from vapor dominated geothermal system can be predicted using onedimensional (i.e., lumped - parameter) or complex three-dimensional reservoir model. The objective of this study is to simulate the response of the system using a lumped - parameter model. The lumped - parameter is a simple model of reservoir simulation which consist of single reservoir block feed by a recharge flow proportional to pressure drop. The lumped - parameter model is an ideal for vapor dominated reservoirs that have produced the steam at least one third to one half of field lifetime. This study have been done to predict the reservoir performance such as pressure depletion, steam rate or deliverability of steam in vapor dominated reservoirs where the material balance for the gas was adopted. The basic principle of the lumped - parameter model assumes that a reservoir has some average properties of fluid and rock***) |