Britannica
Sources used in this answer
- heavy oil and tar sand - In situ combustion
- heavy oil and tar sand - Heavy oils
- petroleum production - Enhanced recovery
- petroleum production - Thermal methods
- petroleum production - Secondary recovery: injection of gas or water
- coal utilization - Advanced combustion technologies
- heavy oil and tar sand - Economic and technical constraints
Why is water injected with air during some in situ combustion projects?
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heavy oil and tar sand
Major oil fields of the Arabian-Iranian basin region.
In in situ combustion projects, a modified form of forward combustion involves injecting cold water alongside air to recover heat that remains behind the burning front.1
This air-water combination serves two primary purposes:
* It improves the efficiency of the process by recovering residual heat from the reservoir.1
* It minimizes the total volume of air required for injection and reduces the amount of in-place oil that must be burned to sustain the combustion front, typically limiting this consumption to between 5 and 10 percent.1