Page 69 - Gas Wettability of Reservoir Rock Surfaces with Porous Media
P. 69
Evaluation Methods and Influencing Factors CHAPTER 2 53
FIGURE 2.16
Screenshot of the goniometry.
150
Wetting angleθ (º) 100 Wetting angle of n-hexadecane
50
Wetting angle of water
0
10
0 2 4 6 Wetting angle of intermediate kerosene 12
8
Zony 18740 concentration (wt%)
FIGURE 2.17
Change rule of liquid contact angle with variation in Zonyl8740 concentration.
polarize the fluorine atom in Zonyl8740, and polarity of fluorinated chains is
less than that of hydrocarbon chains, which makes the hydrophobic effect of
fluorinated chains stronger than that of hydrocarbon chains and keeps fluori-
nated chains oleophobic (hydrocarbon compounds). Hence as Zonyl8740
concentration increases, fluorine-containing groups on the solid surface grow
and σ water , σ n2hexadecane , and σ kerosene increase—i.e., hydrophobicity and oleo-
phobicity are enhanced.
