Recovery of oil by low-pressure miscible gas injection
Patent
·
OSTI ID:6217856
An oil miscible gas, such as carbon dioxide, is injected into a subterranean oil reservoir to maintain a reservoir pressure near the critical pressure of the gas. Under predetermined conditions of temperature and pressure, the miscible gas-crude oil mixture exhibits a 3-phase vapor-liquid phenomena which enhances the recovery of oil from the subterranean reservoir. A miscible gas-rich liquid phase is formed between the oil-rich liquid phase and miscible gas-rich vapor phase and exhibits a density and viscosity intermediate between that of the oil and gas regions. This phenomenon creates a unique fluid distribution and mobility relationship which provides for a significant increase in the efficiency of the displacement of the oil from the gas-swept reservoir. (6 claims)
- Assignee:
- Cities Service Oil Co.
- Patent Number(s):
- US 3623552
- OSTI ID:
- 6217856
- Country of Publication:
- United States
- Language:
- English
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