Physical properties of rocks

Experimental–numerical study of heat flow in deep low-enthalpy geothermal conditions

Accompanying the increased emphasis on using the "solid earth" as a repository for waste as well as a source of fluids is the increased need for prediction of effects of these planned stresses on porous media. To fully describe the state of a fluid in a porous media it is necessary to specify: a) the pressure of the fluid, b) the composition of the fluid and e) the energy contained in the fluid. To describe and thus predict the flow and compositional variation of a fluid in porous media in time and space it is necessary to specify: a) the distribution of parameters affecting flow in the space of interest, b) initial conditions of pressure, composition and temperature or enthalpy, c) sources and sinks affecting flow and chemical variation in time and space, and d) boundary conditions. Presented in this paper are tabulations of data on porosity and permeability factors pertinent to flow; and distribution coefficients and dispersivity factors pertinent to chemical variation. Reported porosities vary from 0.000 to 87.3%, permeabilities range from "too low to measure" to 8.1 cm/sec. Because of the uncertainties of factors affecting laboratory determined dispersivities and distribution coefficients, only field based values are reported for these parameters.

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Physical properties of rocks; porosity, permeability, distribution coefficients, and dispersivity

Geomechanical aspects of reservoir thermal alteration: A literature review

Permeability variations in Berea and Vosges sandstone submitted to cyclic temperature percolation of saline fluids

Experiments designed to measure the intrinsic permeability of hydrological porous mediums have shown that in certain cases the permeability itself varies with tem- perature and is not constant, as was previously assumed. For cemented quartz mediums permeabilities were found to vary by as much as 0.5% per degree C over the temperature span (20-60oC) reported in this experimental study. Similar measurements with vitrified mediums showed no appreciable temperature coefficient of permeability. As a by-product of the investigation a characteristic length parameter, in terms of the laminar (permeability) and inertial flow coefficients, has been used to define a modified Reynolds number for all porous mediums. This length parameter appears to be directly proportional to the mean pore dimension as determined from porosimetry measurements. The data obtained from all samples have been found to correlate well in graphical form and are presented in a generalized friction

http://mastercomputer.persiangig.com/document/Paper_Download/Page-1/15.pdf

David B. Greenberg

Papers

Intrinsic Permeability of Hydrological Porous Mediums: Variation With Temperature