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Results of an initial study of possible reinjection patterns for the Cerro Prieto geothermal field, Baja California, Mexico are discussed. The numerical model and assumptions made are described, then the various cases studied are presented. The resulting data indicate what may be expected from different reinjection schemes and may provide useful guidelines for future reinjection operations at Cerro Prieto and other liquid-dominated geothermal fields. Under the assumptions adopted in these studies, the preliminary results suggest that reinjection of cold brines into the Cerro Prieto reservoir can be safely accomplished without a premature reduction in the temperature of the produced fluids. If the presently available wells, M-3, M-6, and M-7, and M-92, are used for injection, the productive life of the field is strongly dependent upon well M-7. The use of M-7 would probably limit undisturbed production to approximately 30 years; whereas, replacing M-7 by an injection well further away from the production area would lengthen the productive life of the field to over 50 years. (ERA citation 04:007905)