| 摘要 |
Hydrocarbons are recovered from a subterranean hydrocarbon-bearing formation penetrated by an injection well and a production well by displacing hydrocarbons toward the production well using a drive fluid such as water thickened with polyacrylamide or partially hydrolyzed polyacrylamide alkoxylated with an alkylene oxide and, if desired, a small amount of a sulfonated, alkoxylated polyacrylamide, i.e., an N-substituted polyacrylamide having N-substituents of the formula: -(CH2CH2O)m-1CH2CH2SO3M, where m is an integer of from 2 to 5 and M is selected from the group consisting of hydrogen, sodium, potassium or ammonium. Optionally, the drive fluid can be saturated with carbon dioxide, nitrogen and/or natural gas at the injection pressure.
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