Description: A numerical simulation of the fluid production history at the Wairakei field has been performed in a two-dimensional vertical plane which passes through the principal features of the reservoir. A successful history match, in terms of the pressure decline in the system, was obtained. Details of that simulation have been reported elsewhere (Garg, et al., 1976) but the results are summarized herein for clarity. As is well known, substantial land surface subsidence has accompanied production at Wairakei. Both the location of the region of maximum subsidence and the character of the deformation are somewhat anomalous, in that the greatest subsidence occurred outside the production area and substantial evidence exists for non-linear rock behavior during production. The reasons for this peculiar behavior are discussed, and speculations are presented concerning the adequacy of existing subsidence-prediction techniques. 9 refs., 8 figs.
Date: December 1, 1976
Creator: Pritchett, John W.; Garg, Sabodh K. & Brownell, D.H.
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