Interfacial Tension Data and Correlations of Brine/CO2 Systems Under Reservoir Conditions

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIt has been long recognized that interfacial interactions (interfacial tension, wettability, capillarity and interfacial mass transfer) govern fluid distribution and behavior in porous media. Therefore the interfacial interactions between CO 2 , brine and reservoir oil and/or gas should have an important influence on the effectiveness of any CO 2 storage operation. As a model, the interfacial tension of the pure water-CO 2 system has been studied intensively. Nevertheless, to our knowledge, no interfacial tension (IFT) equilibrium data for brine-CO 2 systems are available at reservoir conditions for different salinities, temperatures and pressures.In this paper, we present experimental IFT brine-CO 2 data obtained at high pressures (45 to 255 bar), high temperatures (27 to 100°C) and different salt concentrations (5,000 to 150,000 ppm of NaCl) using the axi-symmetric drop shape analysis technique (ADSA) for a rising drop case. Special attention was paid in developing a procedure to achieve true thermodynamic equilibrium. The themodynamic conditions were selected in order to cover the most practical CO 2 storage cases of interest, liquid and supercritical CO 2 . A correlation was developped on the basis of the Parachor model, the salt effect and a regression fit of more than a hundred IFT experimental values obtained in this study. This correlation yields a Brine-CO 2 IFT prediction at reservoir conditions with a mean absolute deviation of 2.5%. We also present correlations to determine the IFT increase due to salt concentration. The existence of a plateau in the brine-CO 2 IFT values, independent of the temperature and the pressure and only dependent on the salt concentration, has been demonstrated from the experimental data for temperatures between 27 to 71°C and pressures above 150 bar. These pressure and temperature values can be easily found in many geological sites considered as prospects for CO 2 storage. The linear dependency of the IFT increase with molal NaCl concentration has also been demonstrated.

Experimental investigation of the CO2 sealing efficiency of caprocks

“…Chiquet et al (2007a) state that the maximum allowable CO 2 storage pressure may only exceed initial reservoir pressure by a fraction. Correlations of pressure and temperature with interfacial tension and wetting angle and their effect on CO 2 storage capacities have been investigated by Yang et al (2005), Chalbaud et al (2006Chalbaud et al ( , 2009 and Chiquet et al (2007a,b). In addition Shah et al (2008) demonstrated that the water-wettability of caprocks can vary in the presence non-wetting gas (CO 2 or H 2 S) and the mineral substance of the solid phase.…”

Interfacial Tension and Contact Angle Determination in Water-sandstone Systems with Injection of Flue Gas and CO2

“…Hence, this paper also deals with γ water,CO2 and γ water,flue gas at CO 2 storage conditions. Experimental data for the interfacial tension of pure water and brine against CO 2 at reservoir conditions have been reported by several authors (Chalbaud et al 2007, Chalbaud et al 2010, Chalbaud et al 2009, Chalbaud et al 2006, Chiquet et al 2009, Chun and Wilkinson 1995, Georgiadis et al 2010, Hebach et al 2002, Kvamme et al 2007, Nielsen et al 2012, Shariat et al 2011, Shariat et al 2012, Sutjiadi-Sia et al 2008, Yan et al 2001. Nonetheless, according to Hebach et.…”

Confining Properties of Carbonated Dogger Caprocks (Parisian Basin) for CO2Storage Purpose

“…The subjective choice of the tangents as well as the lack of data to convert the mercury based threshold P th for a CO 2 /brine fluid system makes the threshold capillary pressure value uncertain. The chosen values for the fluid pair properties are given in Table 2 and based on published data [13,14]. Another shortcoming of the mercury porosimetry approach is the lack of confining pressure.…”