Secondary recovery
Patent
·
OSTI ID:6432540
In this improved waterflooding process, a water- mobility modifying agent is deposited in the formation prior to injection of the floodwater. The viscosity modifier is dissolved in the water present in the formation, thereby effecting an increase in its viscosity with resultant reduced mobility. Water is injected into the formation, causing displacement of a substantial portion of the oil to the production wells. As the injected water advances through the formation, low mobility water is present at the water-oil interface. Thus connate oil is displaced from the formation directly by a bank of water of reduced mobility, which in turn is displaced by the injected water. The viscosity modifier is injected as a fine dispersion in a non-solvent carrier liquid, which is liquid miscible with the connate oil. (16 claims)
- Assignee:
- Union Oil Co. California
- Patent Number(s):
- US 3336977
- OSTI ID:
- 6432540
- Country of Publication:
- United States
- Language:
- English
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