RECOVERY OF OIL FROM OIL SAND BY STEAM INJECTION.

Athabasca oil sand was studied. In experiments using the cylindrical linear flow model, steam is injected under constant pressure at 5. 0 kg/cm**2 from 150 degree C to 300 degree C. Eighty percent of the oil is recovered in the first 10 minutes after the start of injection. The maximum recovery is 59. 86% at 300 degree C. In experiments using the radial flow model, steam is injected at 200 degree C to 300 degree C under constant pressure at 5. 0 or 16. 0 kg/cm**2. The maximum production rate is obtained in the first 20 minutes after the start of injection and 60 percent of the oil is recovered. The maximum recovery is 50. 54% at 300 degree C under the lower pressure. Recovery increses to 56. 67% at 300 degree C under the higher pressure.