Page 204 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

188 Gas Wettability of Reservoir Rock Surfaces with Porous Media

180 Gas/water system Gas/oil system
160
140
Gas contact angle (º) 100
120

80
60
40
20
0
0–1 0–2 7–1 7–2 15–1 15–2
Rock sample number
FIGURE 5.19
Evaluation of gas wettability of treated cores in gas/liquid (water or oil) system.

Gas permeability before treatment
1600
Gas permeability after treatment
1500
Gas permeability (10 –3 μm 2 ) 1300
1400

1200

1100
1000
0–1 0–2 7–1 7–2 15–1 15–2
Rock sample number
FIGURE 5.20
Effect of gas wettability on gas permeability.
6. Rock sample 0 2 and 15 2 were saturated through vacuum pumping,
and the experimental procedure 2B5 was repeated.
7. Experimental data was collected and analyzed.

5.3.1.3 EXPERIMENT RESULT AND DISCUSSION

Gas permeability of core columns of every experimental group and the gas
contact angle of core slices were measured. The influence of gas wettability on
gas permeability and gas contact angle is as shown in Figs. 5.19 and 5.20.

From Fig. 5.19, it can be seen that gas wettability of blank rock samples is the
poorest. As concentration of the gas alteration agent solution increases, the gas