Page 217 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

Application of Gas Wettability CHAPTER 6 201

FIGURE 6.1
Amphiphilic polymer LCM-8. 20.0

Accumulated percentage composition (%) 90.0 18.0 Section percentage (%)
100.0

80.0
16.0
14.0
70.0
60.0
12.0
50.0
10.0
40.0
8.0
30.0
6.0
20.0
4.0
10.0
0.0
0.0
0.1
0.0
10.0
1.0
Grain size distribution (µm) 100.0 2.0
FIGURE 6.2
Grain size distribution of LCM-8.
The median particle diameter of reservoir protecting agentLCM-8 was 0.31 μm,
the average grain diameter of volume was 0.33 μm, and the average grain
diameter of area was 0.27 μm.
6.1.3.2 PERFORMANCE EVALUATION OF LCM-08
6.1.3.2.1 Film-Formation
Scanning electron microscopy was used to analyze images before and after
film-formation on the surface of filter paper, sides of filter paper, and sand-
stone surface, as shown in Figs. 6.3 6.5. Good film-formation of amphiphilic
polymer reservoir protecting agent LCM-8 was observed on the filter paper
and sandstone surfaces.

6.1.3.2.2 Plug Forming Property
A medium-pressure filter tester using visual casting bed was adopted (see
Fig. 6.6). This device evaluates the filtrate reduction property of the system by