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GL2330-
1976, Muhammadu Aruna, PhD thesis, Stanford University, Department of Petroleum Engineering

Abstract:

The standard procedurle for determining the permeability of porous media according to API Code Mo. 27 is based on the fundamental assumption that: as long as viscous flow prevails, the absolute permeability of a porous medium is a property of the medium, and is independlent of the fluid used in its determination, slip effect being taken into account in the case of gas flow. Absolute permeability has, therefore, been traditionally measured at room conditions, with the assumption that it changes only with overburden pressure and not with temperature. Results obtained at room temperature may then be used to predict performance at reservoir conditions after correction for reduction by stress effects. Although this assumption is true for most fluids, results of recent absolute permeability measurements of water flow through porous media at high temperatures and high overburden pressures differ from room condition values. Not only was the absolute permeability to water at high confining pressure lower than that to other fluids used at room temperature, but also, there was a significant permeability reduction at temperatures. An existing permeameter was modified to enable flow of different fluids through separate flow lines. Distilled water, a white mineral oil, nitrogen and 2-octanol were the fluids used, and tests were carried out on natural consolidated sandstones and unconsolidated silica sand. With the exception of water, the absolute permeabillities of the cores to other fluids showed little or no temperature dependence. †The reduction in permeability to water with temperature increase was attributed to interaction between water and silica. In the case of water flow through geothermal systems or in thermal recovery processes which cause large changes in formation temperatures, the effect of temperatures on absolute permeability should be considered in engineering calculations.



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