| 摘要 |
1,116,320. Secondary recovery. MARATHON OIL CO. 22 Nov., 1966 [22 Nov., 1965], No. 52184/66. Heading E1F. Oil is recovered from subterranean formations using as an injection liquid a microemulsion of an external phase of liquified petroleum gas and higher molecular weight hydrocarbons and a surfactant and water. Water is usually used as the drive liquid but nitrogen CO 2 or natural gas may be used.
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