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Thermal Expansion Behavior of Porous Rocks under Stress

  • Roy F. Greenwald
  • Paul I. Ashqar
  • Wilbur H. Somerton

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.

Keywords

Thermal Expansion Pore Volume Pore Pressure Effective Stress Porous Rock 
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Copyright information

© Purdue Research Foundation 1982

Authors and Affiliations

  • Roy F. Greenwald
    • 1
  • Paul I. Ashqar
    • 1
  • Wilbur H. Somerton
    • 1
  1. 1.University of CaliforniaBerkeleyUSA

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