Title:

Validation and Comparison of Different Models of the Wairakei Geothermal Reservoir

Authors:

Michael L. Sorey, Lara Ju Fradkin

Geo Location:

Wairakei, New Zealand; Taupo Volcanic Zone

Conference:

Stanford Geothermal Workshop

Year:

1979

Session:

Modeling

Language:

English

File Size:

543KB

View File:

Abstract:

Records of pressure, temperature, and mass and energy discharge for the Wairakei geothermal field in New Zealand have been available since 1953. However production began in 1958 and today Wairakei remains as one of the few liquid-dominated systems to be exploited for electrical power. Numerous types of conceptual and mathematical models have been developed to describe the significant features of the Wairakei field under natural and exploited conditions. On the whole, most existing models have yielded results which are reasonably compatible with the observed pressure versus discharge response, be they 0, 1, or 2 dimensional. In such a situation, the choice of model to be used for prediction of future response or for analysis of optimum field management procedures is a difficult task. In this paper we concentrate on the zero-dimensional, or lumped parameter models of the Wairakei reservoir and use system identification techniques to find the best analytical expression for the average pressure response. We show that the corresponding conceptual model may be interpreted as a slow-drainage model in which portions of the reservoir where two-phase conditions develop serve mainly as source of liquid for the underlying single-phase region from which most of the production is obtained. A more detailed discussion of these techniques and comparisions with the results obtained from other lumped and distributed parameter models will be given in a forthcoming paper by Fradkin and Sorey (to be submitted to Water Resources Research).


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