| 摘要 |
1. A method of treating a formation around a wellbore extending from a hydrocarbon-bearing zone comprising the steps of interrupting production from the hydrocarbonbearing zone; introducing into the hydrocarbon-bearing zone a foam forming composition comprising a surfactantin-oil solution; and resuming production from the hydrocarbon-bearing zone. 2. Method according to claim 1, wherein the surfactant concentration in the solution is between 0.5 and 5 per cent by volume. 3. Method according to claim 1 or 2, wherein the surfactant used is a polymeric compound having good solubility in oil, but low solubility in water. 4. Method according to any one of claims 1 to 3, wherein the surfactant is a non-ionic surfactant. 5. Method according to any one of claims 1 to 4, wherein the molecular weight of the surfactant varies in the range of 5,000 to 20,000. 6. Method according to any one of claims 1 to 5, wherein the surfactant is selected from polyesters prepared from acrylates, methacrylates and other vinyl ethers, or siloxanes. 7. Method according to claim 6, wherein the surfactant is a fluoroaliphatic polyester that contains fluoroacrylate derivates. 8. Method according to claim 7, wherein the surfactant is FLUORAD FC-740.
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