Page 239 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

Application of Gas Wettability CHAPTER 6 223

The evaluation illustrates that the compatibility of trapezoid protection agent
A, formation water and modification water is suitable.

6.3.2.2.2 Compatibility Evaluation of Trapezoid Protection Agent
A and Crude Oil
The trapezoid protection agent A with 6% concentration was prepared with
modification water, and the compatibility data is as shown in Table 6.15.
It can be seen from the experimental data that the compatibility of trapezoid
protection agent A and crude oil is good, and the formed oil-water phase
emulsion is stable and difficult to break.

6.3.2.3 MEASUREMENT OF ANTISWELLING RATE
The antiswelling rate of trapezoid protection agent A was measured and the
experimental results areas shown in Fig. 6.16.
It can be seen from the antiswelling evaluation that for the trapezoid protec-
tion agent A, the antiswelling rate is up to 80% at 6% concentration. In addi-
tion, changes in antiswelling rate are gentle, within 6%B10%. Therefore,
while injecting water, 6% working concentration of trapezoid protection agent
A is recommended (Table 6.16).

Table 6.15 Compatibility Experiment of Trapezoid Protection Agent A
and Crude Oil

Formulation Break Dehydrating Phenomena
Time (h) Amount (mL) Observation
Oil Water
Phase Phase
Oil 25 mL 1 6% trapezoid 1 0 Black No
protection agent A25 mL 30 0 Black No
60 0 Black No

Table 6.16 Experimental Results of Antiswelling Effects of
Trapezoid Protection Agent A
Concentration (%) Antiswelling Rate (%)
2 60.4
4 71.8
6 82.5
8 83.4
10 85.2