tailieunhanh - Streaming Potential in Unconsolidated Samples Saturated with Monovalent Electrolytes

In this work, the measurements of the streaming potential for four unconsolidated samples (sandpacks) saturated with four monovalent electrolytes at six different electrolyte concentrations have been performed. From the measured streaming potential coefficient, the empirical expression between the streaming potential coefficient and electrolyte concentration is obtained. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 1 (2018) 14-24 Streaming Potential in Unconsolidated Samples Saturated with Monovalent Electrolytes Luong Duy Thanh1,*, Rudolf Sprik2 1 Thuy Loi University, 175 Tay Son, Dong Da, Hanoi, Vietnam Van der Waals-Zeeman Institute, University of Amsterdam, The Netherlands 2 Received 30 July 2017 Revised 22 September 2018; Accepted 22 September 2018 Abstract: The streaming potential coefficient of liquid-rock systems is theoretically a very complicated function depending on many parameters including temperature, fluid concentration, fluid pH, as well as rock parameters such as porosity, grain size, pore size, and formation factor etc. At a given porous media, the most influencing parameter is the fluid conductivity or electrolyte concentration. Therefore, it is useful to have an empirical relation between the streaming potential coefficient and electrolyte concentration. In this work, the measurements of the streaming potential for four unconsolidated samples (sandpacks) saturated with four monovalent electrolytes at six different electrolyte concentrations have been performed. From the measured streaming potential coefficient, the empirical expression between the streaming potential coefficient and electrolyte concentration is obtained. The obtained expression is in good agreement with those available in literature. Additionally, it is seen that the streaming potential coefficient depends on types of cation in electrolytes and on samples. The dependence of the streaming potential coefficient on types of cation is qualitatively explained by the difference in the binding constant for cation adsorption on the silica surfaces. The dependence of the streaming potential coefficient on samples is due to the variation of effective conductivity and the zeta potential between samples. Keywords: Streaming potential coefficient, zeta potential, porous media, sands. 1. Introduction The streaming potential is induced by