Page 219 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

Application of Gas Wettability CHAPTER 6 203

Air
source
Pressure gauge

Drilling fluid
Filter screen and the support Casting
bed

FIGURE 6.6
Medium-pressure filter tester using visual casting bed.

14 Before hot aging
Invasion depth of mud (cm) 10
12
After hot aging
8

6
4
2
0
CMJ–2 LCM–8
Different additives
FIGURE 6.7
Comparison of the invasion depth of several kinds of film-forming agents (concentration 20%).
Note:
1. GPJ-08: The first generation product of film-forming agent developed by this project group, and has
been universally used in the field.
2. CMJ-2: Is universally used in China.

calculating the depth of invasion of drilling fluids into the casting bed, and
measures the depth of invasion of the amphiphilic polymer reservoir protect-
ing agent LCM-8 and other kinds of film-forming agents, as shown in Fig. 6.8.
It is obvious that the depth of invasion of LCM-8 is lower than that in the
samples compared, illustrating that LCM-8 forms a more compact and tough
membranoid substance on the casting bed (Fig. 6.7).

6.1.3.2.3 Compatibility
Sodium bentonite was used to prepare the base slurry at a concentration of
3
1.03 g/cm . Various film-forming agents at different concentrations were