Abstract of the paper ``Effective-stress rules for pore-fluid transport in
rocks containing two minerals''
When an oil field is being pumped down, the in situ hydrostatic pressure
decreases and permeability also decreases in response. Possibility of
controlling this process depends on knowing the correct effective-stress rule
for permeability in the field. Although some effective-stress analysis
for permeability has been published previously, the work
summarized here is the first to use scaling rules to establish general results.
Data on the pore-pressure dependence of fluid permeability for some rocks
cannot be explained using any equivalent homogeneous porous medium. However,
deformation measurements on both high porosity sandstones and low porosity
granites have been explained adequately in terms of
an equivalent two-constituent model of porous rocks, for which exact results
relating constituent moduli to macroscopic effective moduli have been
discovered.
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