Oil recovery process using an unhydrolyzed polyacrylamide and partially hydrolyzed polyacrylamide mobility control agent
A design criterion for an optimum flooding process to recover increased amounts of oil in secondary recovery methods, is to have the mobility of the displacing fluid about equal to or less than that of the combination of the formation fluids (hydrocarbon and interstitial water) within the reservoir. This has been accomplished by injecting into the waterflood a single agent to effect a reduction in mobility. Generally, this agent is a partially hydrolyzed, high molecular weight polyacrylamide. Improved mobility control is achieved by injecting an aqueous solution of unhydrolyzed polyacrylamide and partially hydrolyzed polyacrylamide into the oil-bearing formation.The result of the injection of this aqueous solution is a substantial increase in production of petroleum from subterranean formations. (6 claims)
- Assignee:
- Marathon Oil Co.
- Patent Number(s):
- US 3743018
- OSTI ID:
- 5378525
- Country of Publication:
- United States
- Language:
- English
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