Thermal injection process for recovery of heavy viscous petroleum
Patent
·
OSTI ID:7363932
A method is claimed for recovering heavy viscous petroleum from a subterranean formation penetrated by an injection well, said method comprising: injecting a heated fluid comprising steam and a heated non-condensable gas into the hydrocarbonaceous subterranean formation through the well to elevate the temperature of the heavy viscous petroleum contained therein for increasing its mobility, said heated fluid being injected into the formation at a predetermined initial injection rate under a pressure below the formation fracture gradient pressure until the heated fluid injection rate diminishes to a predetermined level; discontinuing the injection of the heated fluid into the formation and substantially immediately injecting a heated non-condensable gas into the formation through the well to drive heat outwardly through the formation from the well to prevent formation blockage of movement of the heated fluid through the formation, said heated non-condensable gas being injected into the formation at a pressure below the formation fracture gradient pressure continuously until the injection rate thereof reaches a predetermined desired level; and repeating these steps in sequence until said formation and petroleum contained therein are heated to a predetermined extent.
- Assignee:
- Carmel Energy, Inc.
- Patent Number(s):
- US 3948323
- OSTI ID:
- 7363932
- Country of Publication:
- United States
- Language:
- English
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