Abstract
The axial thermal expansions and pore volume contractions of water-saturated Berea, Bandera, and Boise sandstones under stress have been determined as functions of temperature. The samples were subjected to a constant confining stress of 20.7 MPa and pore pressure of 6.9 MPa while being heated from 35°C to 175°C. Resultant decreases in the porosities were 4.4, 3.8, and 3.1 percent for Bandera, Berea and Boise sandstones, respectively. The effect of a variation in stress on Boise sandstone was also investigated. It was found that by decreasing the confining stress to 13.8 MPa the porosity reduction was decreased to 2.6 percent.
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