An Experimental Investigation of the Permeability of Kayenta and St. Peter Sandstones to Hypersaline Brine in the Temperature Interval 70 to 90 C at 10. 3-MPa Confining Pressure

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Author: Piwinskii, A.J., Netherton, R.
Description:Permeabilities of 10.2 cm in length, 2.5 cm in diameter Kayenta (porosity, 20.7, plus minus 1.66 percent) and St. Peter (porosity, 13.6, plus minus 0.13 percent) sandstones to Magmamax No. 1 brine containing suspended solids were determined from 70 to 90C at 10.3-MPa confining pressure. Measurements were performed without filters, with one 10 micro-meter filter, and with two 10 micro-meter filters inserted upstream of the core sample. In all cases, there was a dramatic decrease in permeability within the first hour of flow or few hundred pore volumes of flow through the core. Experiments conducted without filters or with one filter yield permeabilities that represent both the rock and the 2 to 3 mm amorphous silica-iron layer on the top face of the core. The experimental results show that if the Salton Sea Geothermal Field (SSGF) were composed of porous, sedimentary formations similar to Kayenta sandstone, long-term injection of unmodified Magmamax brine would not be feasible. In the case of acidified brine, most of the permeability decline may result from the mobilization of calcite. this resource also goes by the id: oitGHC_0127-01.
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