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Numerical Simulation of Production and Subsidence at Wairakei, New Zealand

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.
Partner: UNT Libraries Government Documents Department

Development of New Geothermal Wellbore Holdup Correlations Using Flowing Well Data

Description: Geothermal well performances depend primarily on four factors: reservoir pressure, permeability, temperature and wellbore size. The ability to predict both the quantity of fluid that can be produced and its thermodynamic state (pressure, temperature, enthalpy, gas content, salinity, etc.) is essential for estimating the total usable energy of a geothermal resource. Numerical reservoir simulators can be utilized to calculate the thermodynamic state of the fluid in the reservoir when it enters the wellbore. To compute the fluid properties as it travels up the wellbore to the well-head given certain reservoir conditions the use of a wellbore simulator is needed. This report contains new correlations for flowing geothermal wells to accurately estimate produced fluid properties.
Date: March 1, 2004
Creator: Garg, Sabodh K.; Pritchett, John W.; Alexander, James H. & Renner, Joel
Partner: UNT Libraries Government Documents Department

A Study of Production/Injection Data from Slim Holes and Large-Diameter Wells at the Okuaizu Geothermal Field, Tohoku, Japan

Description: Discharge from the Okuaizu boreholes is accompanied by in situ boiling. Analysis of cold-water injection and discharge data from the Okuaizu boreholes indicates that the two-phase productivity index is about an order of magnitude smaller than the injectivity index. The latter conclusion is in agreement with analyses of similar data from Oguni, Sumikawa, and Kirishima geothermal fields. A wellbore simulator was used to examine the effect of borehole diameter on the discharge capacity of geothermal boreholes with two-phase feedzones. Based on these analyses, it appears that it should be possible to deduce the discharge characteristics of largediameter wells using test data from slim holes with two-phase feeds.
Date: June 1, 2002
Creator: Renner, Joel Lawrence; Garg, Sabodh K. & Combs, Jim
Partner: UNT Libraries Government Documents Department