Article history: For a low-permeable water-saturated cap-rock, interfacial tension between CO and connate water and Received 14 October 2015 interfacial interactions among reservoir rock, connate water and CO system are major parameters to Received in revised form 28 March 2016 evaluate the capillary sealing characteristics of the cap-rock. Moreover, the amount of CO which is 2, Accepted 2 April 2016 trapped by capillary forces, depends on the wetting properties of the reservoir rock. In this work, contact Available online 14 April 2016 angles of a water/shale system with CO were determined at high pressures and a constant temperature of 318 K and at a salinity of pure water and 1 M NaCl. To prevent neglecting the di-electrical and petro- Keywords: physical properties of natural rocks, all experiments have been performed using natural shale surfaces Interfacial tension without any chemical treatment. In addition, to describe the wetting properties of the shale at different Contact angle temperatures, surface-free-energy analysis based on the modiﬁed equation of state (EOS) is used. The Surface-free-energy analysis results show that the contact angle of a CO /water/shale system increases with decreasing temperature. Natural shale 2 High pressure and temperature However, the change of contact angle with
International Journal of Greenhouse Gas Control – Elsevier
Published: Jun 1, 2016
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