Table 3: Start-up pressure gradient with different oil viscosities in different permeable sand packs

Temperature °C	Kg (10-3μm2)	Viscosity mPa.s	Min Start-up Pressure Gradient (MPa/cm)	Threshold Pressure (MPa/cm)	Max Start-up Pressure Gradient (MPa/cm)
60	8000	237600	0.5559	0.7544	1.1857
	2000	237600	0.8933	—	—
80	8000	25127.5	0.1997	0.2331	0.2842
	2000	25127.5	0.2173	0.2903	0.4534
	450	25127.5	0.4640	0.5714	0.9643
110	8000	2258.3	0.0138	0.0260	0.0553
	2000	2258.3	0.0200	0.2194	0.5500
	450	2258.3	0.0553	0.1608	0.6739
140	8000	365.12	0.0050	0.0074	0.0143
	2000	365.12	0.0160	0.0485	0.1130
	450	365.12	0.0253	0.0385	0.3293