The Encyclopedia of Empire
The Encyclopedia of Empire
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帝国百科全书
DOI：
10.1002/9781118455074.wbeoe246
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Jackson A
中科院分区：
文献类型：
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作者：
Jackson A
室内实验和矿场试验表明，通过控制矿化度水驱(CSW)过程中注入的卤水成分的改变，可以提高碳酸盐岩油藏的采收率。然而，对CSW的了解仍然很少，也没有方法预测最佳的CSW组成。这项工作首次证明，CSW过程中提高石油采收率(IOR)与矿物-水和油-水界面上Zeta电位的变化密切相关。我们报道了只有当卤水组成的变化引起油-卤水界面和矿物-卤水界面之间的排斥静电力时，才会在CSW过程中发生IOR的实验。在设计最佳CSW组成时，必须确定两个界面上Zeta电势的极性。提出了一种新的实验方法，实现了这一点。结果还首次表明，在与碳酸盐岩储层相关的条件下，油-水界面的Zeta电位可能为正。对于任何CSW模型来说，一个关键的挑战是解释为什么不总是观察到IOR。在这里，我们认为，使用常规(稀释)方法处理CSW的失败可能是由于未被识别的带正电的油-水界面造成的。
Laboratory experiments and field trials have shown that oil recovery from carbonate reservoirs can be increased by modifying the brine composition injected during recovery in a process termed controlled salinity water-flooding (CSW). However, CSW remains poorly understood and there is no method to predict the optimum CSW composition. This work demonstrates for the first time that improved oil recovery (IOR) during CSW is strongly correlated to changes in zeta potential at both the mineral-water and oil-water interfaces. We report experiments in which IOR during CSW occurs only when the change in brine composition induces a repulsive electrostatic force between the oil-brine and mineral-brine interfaces. The polarity of the zeta potential at both interfaces must be determined when designing the optimum CSW composition. A new experimental method is presented that allows this. Results also show for the first time that the zeta potential at the oil-water interface may be positive at conditions relevant to carbonate reservoirs. A key challenge for any model of CSW is to explain why IOR is not always observed. Here we suggest that failures using the conventional (dilution) approach to CSW may have been caused by a positively charged oil-water interface that had not been identified.