Page 166 - Gas Wettability of Reservoir Rock Surfaces with Porous Media
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150 Gas Wettability of Reservoir Rock Surfaces with Porous Media
60,000
50,000
Resistivity, Ω.m 30,000 1%FC-1
40,000
20,000
10,000
Water-wetting
0
0 200 400 600 800 1000
Frequency, KHZ
80,000
70,000
60,000
Resistivity, Ω.m 40,000 2%FC-1
50,000
30,000
20,000
10,000
Water-wetting
0
0 200 400 600 800 1000
Frequency, KHZ
FIGURE 4.16
Changes in electrical resistance of cores caused by different saturated fluids.
gas-wetting alteration agent water solution entered into gaps of rock cores, the
nonconductive core skeleton reduced the cross-sectional area accessible for
current, and increased the length of conductive path at the same time.
Therefore, electrical resistance of cores is much higher than that of gas-wetting
alteration agent water solution of same volume.
4.3.1.2 EFFECT OF WETTABILITY ON ELECTRICAL RESISTANCE OF
SATURATED FORMATION WATER
4.3.1.2.1 Experimental Procedure
The core treated with gas-wetting alteration agent was dried for 24 hours at
100 C, and then placed in a core chamber for vacuuming for 3 4 hours. The
differential pressure was reduced to 20.1 MPa. The vacuum was run conti-
nuosly for 4 hours. Then, the water in the simulated formation layer was
pumped into the core chamber under 10 MPa saturated pressure. The satura-
tion process was maintained for 2 days. The core to be measured was scrubbed
