Page 125 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

Gas-wetting Alteration Agent and Gas-wetting CHAPTER 3 109

FIGURE 3.17
Effect of concentration of polymer emulsion MPEG-b-F08 on contact angle in capillary rise.

FIGURE 3.18
Effect of concentration of polymer emulsion MPEG-b-F07on contact angle in capillary rise.

polymer, when the concentration was 10%, the contact angles of gas/water
system and oil/gas system were at a maximum of 103.56 and 79.03 degrees,
respectively. In the capillary treated with MPEG-b- F07 polymer, when the
concentration was 10%, the contact angles of gas/water system and oil/gas sys-
tem were at a maximum of 118.31 and 77.98 degrees, respectively.

3.3 MECHANISM OF CORE GAS WETTABILITY
ALTERATION
3.3.1 Experimental Study of Mechanism of Core Gas
Wettability Alteration
1. Distribution of fluorine elements on the film surface of fluorinated acry-
late copolymer
In the two-component copolymer system, e.g., one component is the fluoride-
free part and the other is the fluorine-containing part. According to Gibbs
absorption formula, it can be seen that if component 1 has lower surface