Abstract
The produced water of Nahran Omar oil fields used for isolated the biosurfactant produce Candidacruzi which enhanced by using carbon and nitrogen sources, the biosurfactant production was followedby measuring the oil spreading, emulsification activity, oil collapse and cleaning oil contaminatedvessels. The crud biosurfactant was able to spreading the oil (24) mm with (8%) emulsification activityand oil collapse of (++) the result of cleaning oil contaminated vessels revealed the recovered of oilfrom the wells of vessels. Under optimization of carbon and nitrogen sources the results revealed thatthe largest oil displacement was (9) mm with dextrin the maximum emulsification power was ( 92.8%and 92.5% ) for lactose and fructose respectively, these results demonstrated the high potential ofemulsifiers produced by C. cruzi that can play an important role in application in enhance oil recovery
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