Numerical investigation of production behavior of deep geothermal reservoirs at super-critical conditions

Numerical investigation of production behavior of deep geothermal reservoirs at super-critical... Numerical simulations have been performed to predict pressure transients in deep geothermal reservoirs at sub- and super-critical temperatures. First, pressure drawdown and buildup tests of reservoirs with different initial conditions were simulated. The calculated pressure responses are dominated by non-linear changes of fluid kinematic viscosity and compressibility. The pressure of a super-critical zone is shown to cause complex behavior. Short- and long-term production tests in both unbounded and bounded reservoirs were then simulated. Unbounded and bounded reservoirs exhibit very similar short-term production behavior near or above the critical temperature (375–400°C). Unbounded reservoirs of low transmissivity ( kh = 1 darcy-meter) exhibit long-term production behavior that depends on whether the reservoir is sub-critical (300–375°C) or super-critical (400°C); substantial increases in flowing enthalpy and declines in feedpoint pressure occur at early times in the super-critical reservoir. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geothermics Elsevier

Numerical investigation of production behavior of deep geothermal reservoirs at super-critical conditions

Geothermics, Volume 27 (5) – Aug 14, 1998

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Publisher
Elsevier
Copyright
Copyright © 1998 Elsevier Science Ltd
ISSN
0375-6505
eISSN
1879-3576
D.O.I.
10.1016/S0375-6505(98)00041-8
Publisher site
See Article on Publisher Site

Abstract

Numerical simulations have been performed to predict pressure transients in deep geothermal reservoirs at sub- and super-critical temperatures. First, pressure drawdown and buildup tests of reservoirs with different initial conditions were simulated. The calculated pressure responses are dominated by non-linear changes of fluid kinematic viscosity and compressibility. The pressure of a super-critical zone is shown to cause complex behavior. Short- and long-term production tests in both unbounded and bounded reservoirs were then simulated. Unbounded and bounded reservoirs exhibit very similar short-term production behavior near or above the critical temperature (375–400°C). Unbounded reservoirs of low transmissivity ( kh = 1 darcy-meter) exhibit long-term production behavior that depends on whether the reservoir is sub-critical (300–375°C) or super-critical (400°C); substantial increases in flowing enthalpy and declines in feedpoint pressure occur at early times in the super-critical reservoir.

Journal

GeothermicsElsevier

Published: Aug 14, 1998

References

  • An approach through similarity analysis.
    Duckler, A.E.; Wicks, M.III; Cleveland, R .G.

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