Preparation of Oil-Based Foam Gel with Nano-SiO₂ as Foam Stabilizer and Evaluation of Its Performance as a Plugging Agent for Fractured Shale

Table 1

Experimental parameters.

Experiment number	Inflow velocity (mL/s)	Temperature (°C)	Annulus pressure (MPa)	Sand diameter (mm)	Whether to add plugging agent	Core diameter/length(mm)	Porosity (%)	Permeability (10^-3 m^2)
1	1	80	6	0.850	No	25/50	6.2	1.790
2	1	80	6	0.850	Yes	25/50	6.2	1.790
3	2	80	7	0.850	No	25/50	5.4	0.981
4	2	80	7	0.850	Yes	25/50	5.4	0.981
5	1	80	6	0.425	No	25/50	4.8	0.869
6	1	80	6	0.425	Yes	25/50	4.8	0.869
7	2	80	7	0.425	No	25/50	4.6	0.808
8	2	80	7	0.425	Yes	25/50	4.6	0.808
9	1	80	6	0.180	No	25/50	4.4	0.782
10	1	80	6	0.180	Yes	25/50	4.4	0.782
11	2	80	7	0.180	No	25/50	4.2	0.691
12	2	80	7	0.180	Yes	25/50	4.2	0.691