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北京石油化工学院2026年研究生招生接收调剂公告
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李ruipenG

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[求助] 表面活性剂

ABSTRACT: Alkyl ether carboxylate is one type of surfactant that can produce ultralow interfacial tension (IFT) under highsalinity
and high-temperature conditions. In this paper, the influence of counterions on dynamic IFTs of fatty alcohol
polyoxyethylene carboxylate (C12EO3C) against alkanes has been studied. The effect of the temperature on the IFT has been
investigated. On the basis of our experimental results, one can find that the NaCl concentration has little effect on the IFT, while
divalent ions can reduce the IFT to an ultralow value. With the increasing CaCl2 or MgCl2 concentration, dynamic IFT passes
through a minimum at a particular salt concentration (“V” shape). Moreover, the stable value of IFT achieves an ultralow value
and also passes through a minimum at the same salt concentration. MgCl2 has a stronger tendency to achieve ultralow IFT than
that of CaCl2, while the addition of CaCl2 has a stronger tendency to partition surfactant molecules to the oil phase. Ultralow IFT
could also be achieved by improving the temperature because of the enhancement of oil solubility of the surfactant. An interfacial
model combining two mechanisms, partitioning the surfactant into the oil phase and decreasing the charge repulsive force
between interfacial surfactant molecules, responsible for the effect of the electrolyte on dynamic IFT has been provided. All
experimental results above can be explained well. Our studies are of great significance in designing ultralow IFT formulation for
the reservoir in a high temperature and with high-salinity formation water.

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