Effect of CO2 phase on contact angle in oil-wet and water-wet pores

A statistical analysis of the effects of pressure, temperature and salinity on contact angles in CO 2 –brine–quartz systems

“…This may be related to the CO 2 behaviour becoming non-ideal at 10 MPa (Dickson et al, 2006), at which point there is significant miscibility between the phases (Sutjiadi-Sia et al, 2008), and suggests that there may be more to the pressure effect than just the phase of the CO 2 . We also note that, unlike the results of Dickson et al (2006) and Sutjiadi-Sia et al (2008), the recent experiment of Li and Fan (2015) using a CO 2 -brine-glass system reported no trends in contact angle from pressure increases, though a large jump in contact angle was evident when CO 2 phase changed from gas to liquid (at 20 • C) or gas to supercritical (at 40 • C); their contact angles are similar to those of Espinoza and Santamarina in displaying no pressure trends but a marked increase in contact angles in brine (circa 40 • ) relative to water (circa 30 • ).…”

Uncertainty in fault seal parameters: implications for CO<sub>2</sub> column height retention and storage capacity in geological CO<sub>2</sub> storage projects

“…With pressure rising from 10 to 15 MPa, θ increases up to 10° on quartz surfaces, while an increase of temperature from 50°C to 70°C at 10 MPa leads to an increase in θ of 15° (Sarmadivaleh et al, 2015). The CO2 state also seems to influence the contact angle in oil-wet pores with θgas < θsc (Li and Fan, 2015). Additionally, the wettability of rocks may shift towards more hydrophobic the longer it is exposed to a CO2brine mixture (Wang and Tokunaga, 2015).…”

Effect of chemical structure of organics on pore wetting

“…Due to lack of a technique for directly measuring the contact angle in a small pore, the pore wetting is often simply estimated by the contact angle measured on a flat substrate (Ameri et al, 2013;Bharatwaj et al, 2007;Broseta et al, ϱ 2012;Chiquet et al, 2007;Jung and Wan, 2012;Wang et al, 2012;Yang et al, 2008), which might be relevant in some cases but deserves to be assessed (Gomez et al, 2000;Kim et al, 2012). Thus, we used an experimental apparatus recently used in our laboratory (Li and Fan, 2015;Li et al, 2013;Li et al, 2014) to directly measure the contact angles of pure organics in a single glass capillary. This paper systematically examines the effects of functional group (-OH, -NH 2 , -COOH) and the length and structure of alkyl chain of pure amphiphilic organic compounds on their contact angles in a glass pore.…”

“…In this study, the contact angles of a range of organic compounds were directly measured in a glass micron-sized pore by the pore contact angle measurement technique we recently used (Li and Fan, 2015;Li et al, 2013;Li et al, 2014). We investigated the effect of chemical structure of organics on glass pore wetting in terms of functional group, alkyl chain length and chain structural isomer.…”