驱油方式对采出液破乳效果的影响

Effect of oil extraction methods on the demulsification of produced liquid

通过室内模拟试验评价了驱油方式对采出液化学破乳效果的影响。水驱、聚合物驱和三元复合驱采出液化学破乳效果之间存在明显差异,聚合物驱和三元复合驱采出液的热化学脱水效果好于水驱采出液,三元复合驱采出液破乳后的水相残余乳化油量大于水驱和聚合物驱采出液;三元复合驱工业化应用后,如果直接沿用已建水驱和聚合物驱采出液游离水脱除装置处理三元复合驱采出液,那么将使游离水脱除器放水的含油量大幅度上升,所以必须研制适应三元复合驱采出液,特别是弱碱体系三元复合驱采出液的高效破乳剂。

The effect of oil extraction methods on the demulsification of produced liquid were investigated in laboratory experiments in artificial crude oil emulsions. There are significant differences among the chemical demulsification performance of produced liquids products respectively by water flooding, polymer flooding and ASP （ alkali - surfaetant - polymer） flooding. The thermo - chemical dehydration performances of polymer flooding and ASP flooding produced liquids are better than water flooding produced liquid. There is more emulsified crude oil in produced water separated from ASP flooding product liquid than the produced water separated from water flooding and polymer flooding produced liquids. The oil carry - over in the FWKO （ free water knockout） effluent water is expected to go up dramatically if industrial - scale ASP flooding produced liquid is piped to the existent production facilities designed for water flooding produced liquid or polymer flooding produced liquids handing. It is thus necessary to develop new high - efficient demulsifiers for ASP flooding produced crude oil emulsions, especially for those produced crude oil emulsions by ASP flooding using weak alkalis.