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Influence of steam/water relative permeability models on predicted geothermal reservoir performance [electronic resource] : a sensitivity study

Published:
Albuquerque, N.M. : Sandia National Laboratories, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 7 : digital, PDF file
Additional Creators:
Sandia National Laboratories
United States. Department of Energy. Office of Scientific and Technical Information
Access Online:
www.osti.gov

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Summary:
The objective of the present effort was to conduct a sensitivity study, using the SHAFT code, to demonstrate the influence of various RPMs (relative permeability models) on predicted geothermal reservoir performance. A basic model devised to accomplish this goal was one which would allow each of the four noted saturation limits to be specified (input) independently; k{sub L}(s) and k{sub G}(s) were then modeled as having a linear dependence on s between these specified limits. A one-dimensional problem was chosen for study. An infinite porous reservoir containing liquid water at p₁ = 10.4 bars and T₁ = 180°C was connected to a permeable stratum initially at the same pressure and temperature. The stratum was assumed to be bounded above and below by layers of impermeable rock. Heat conduction from these layers to the stratum was neglected. At time (t) zero, a well-bore was joined to the stratum, i.e., a boundary condition of p₂ = 1.06 bars was specified at the stratum exit. The transient problem was then solved for p(x,t), T(x,t) and s(x,t) until a steady-state solution was achieved. In all cases, a short region of liquid water flow, followed by an extended region of two-phases, steam/water, flow was predicted to occur. Reservoir performance or output was quantified by the product of the total, steady-state, mass flux (W) and the mixture enthalpy (H) at the stratum exit (i.e., into the well). All such steady-state convective energy fluxes (WH) were non-dimensionalized by the product (WH{sub REF}) predicted to occur at the same location for a reference case RPM. The reference case utilized is one which possessed no trapped phases, while still maintaining the stated linear dependence of k{sub L} and k{sub G} on s. (MHR)
Subject(s):
Note:
Published through SciTech Connect.
01/01/1980.
"sand-80-2633c"
" conf-801233-1"
6. annual workshop on geothermal reservoir engineering, Stanford, CA, USA, 16 Dec 1980.
Eaton, R.R.; Reda, D.C.
Funding Information:
AC04-76DP00789
View MARC record | catkey: 14387003