In 1984 a detailed three-dimensional well-by-well model was developed for the Olkaria geothermal field in Kenya. The model was calibrated against the production history of the field over the period 1977 through 1983, using porosities and permeabilities as adjustable parameters. During this p~riod two 15-MWe Units WCE put on-Yie at Okark the third 15 MWe Unit commenced operation in March 1985. The numerical model was used to predict the performance of the Olkaria wells and these predictions have been compared with the observed well behavior for the period 1984 to 1987. In general. the model predictions show satisfactory agreement with the observed well behavior, especially for those wells that had production histories exceeding two years. The predicted steam ram for most of the wells were accurate to within 1 kgls for the period considered and the steam rate decline was well predicted by the model. Some di&nnces between the observed and predicted total flow rates and enthalpies of individual wells wen seen, especially in those .wells with large enthalpy variation or unoRhodox inmaes in total flow rate. The model also predicted that 3 make-up wells would be nctded by the end of 1987, which is consistent with the observed decline in total steam rates.

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