Surface deposition from fluid flow in a porous medium |
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Authors: | Graham J Weir Stephen P White |
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Institution: | (1) Applied Mathematics, The New Zealand Institute for Industrial Research and Development, PO Box 31-310, Lower Hutt, New Zealand |
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Abstract: | The changes to porosity and permeability resulting from surface deposition and early dissolution in an initial rhombohedral
array of uniform spheres are studied. Very rapid decreases in permeability result from early deposition, with 48 percent reduction
predicted in permeability from 8 percent reduction in porosity. After deposition has caused about a 1 percent increase in
the radii of the spherical array, relative permeability reductions vary approximately as the square of relative changes in
porosity. These theoretical results are matched with experimental data of Itoi et al. and Moore et al. on deposition of silica. Satisfactory results are obtained in some cases, but for other cases a more complex model of the
porous medium is needed. |
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Keywords: | deposition geothermal fields silica fluid flow |
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