| 摘要 |
Oil is recovered simultaneously from all phases of a surfactant-produced crude oil or simultaneously from the middle and upper phases of such an emulsion by acidizing the emulsion with a mineral acid, preferably nitric acid. Following the acidation step, the oil is rendered relatively noncorrosive by the use of a neutralization step which incorporates a demulsifier to prevent the reformation of subsequent emulsions. Polyalkyloxyamines are particularly useful as both neutralizers and demulsifiers. The process of the present invention is useful in the demulsification of crude oil emulsions produced by surfactant floods utilized in secondary and tertiary oil recovery techniques. The invention is particularly beneficial in the treatment of such emulsions produced by micellar or micellar-polymer flooding of oil reservoirs.
|
