Page 123 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

Gas-wetting Alteration Agent and Gas-wetting CHAPTER 3 107

Table 3.14 Measuring the Contact Angle of Liquid on Core P27

Rock Sample Contact Angle ( ) Surface Energy (mN/m)
Water Oilfield Sewage Crude Oil
Untreated 1.69 1.56 35.76 71.17
MPEG-b- F06 126.53 112.32 76.61 7.95
MPEG-b- F08 128.86 125.40 104.19 6.97
MPEG-b- F07 111.77 110.86 113.32 15.44

Table 3.15 Measuring the Contact Angle of Liquid on Core PJ2
Rock Sample Contact Angle ( ) Surface Energy (mN/m)

Water Oilfield Sewage Crude Oil
Untreated 1.84 4.43 22.37 71.16
MPEG-b- F06 126.34 122.04 92.59 8.08
MPEG-b- F08 133.20 120.66 96.28 5.78
MPEG-b- F07 112.46 108.55 104.79 15.04

Table 3.16 Measuring the Contact Angle of Liquid on Core Khotan No.4
Rock Sample Contact Angle ( ) Surface Energy

(mN/m 21 )
Water Oilfield Sewage Crude Oil
Untreated 0.70 0.75 36.83 71.19
MPEG-b- F06 126.94 118.50 95.40 7.79
MPEG-b- F08 106.06 115.19 100.79 18.61
MPEG-b- F07 126.10 110.51 103.51 8.27

2. Gas-wetting alteration characterization of fluorine-containing amphiphi-
lic block polymeremulsion
In this section, different cores were treated with fluoro-mono-
methacrylate (F06), F07 and F08, and macromolecule initiator MPEG
with synthesized polymer solution, at a mole ratio of 400:1, among
which, the treatment concentration of MPEG-b-F06 was 35 vol%, and
that of MPEG-b- F08 and MPEG-b- F07 was 10 vol%. The treatment
lasted 6 hours. After the cores were dried naturally at room temperature,
the contact angles of distilled water, oilfield sewage, hexadecane and
crude oil weremeasured separately. The treatment result ofcore P27 is
shown in Table 3.14.
Treatment result of core PJ2 is shown in Table 3.15.
Treatment result of core, Khotan No.4 is shown in Table 3.16.