壬基酚聚氧丙烯醚硫酸盐-Na2CO3-桩西原油体系的油-水动态界面张力

 合成了壬基酚聚氧丙烯醚硫酸盐(NPPS)表面活性剂。以NaCl质量分数0.5%的盐水为模拟地层水， 分别配制了NPPS、Na₂CO₃及Na₂CO₃-NPPS复配物与桩西原油的混合体系，测定了体系的油-水动态界面张力。结果表明，单独使用Na₂CO₃或NPPS都无法使盐水-桩西原油体系的油-水界面张力降到0.01mN/m以下。采用NPPS与Na₂CO₃复配，协同效应明显，当体系中Na₂CO₃的质量分数大于0.35 %时，仅需质量分数0.0025 %的NPPS，体系油-水界面张力即可以降至10 ^-4 mN/m以下。

DYNAMIC INTERFACIAL TENSION OF OIL-WATER IN NONYLPHENOL POLYOXYPROPYLENE ETHER SULFATE-Na2CO3-ZHUANGXI CRUDE OIL SYSTEM

Abstract: Nonylphenol polyoxypropylene ether sulfate(NPPS), a candidate surfactant for enhanced oil recovery, was synthesized. Dynamic interfacial tensions of oil-water were examined in the systems of NPPS，Na2CO3 and Na2CO3-NPPS combinational, respectively, with Zhuangxi crude oil, into which 0.5% NaCl (mass fraction) was added to imitate Zhuangxi formation water. It is found that interfacial tension of oil-water could not reach 10-2 mN/m in the Na2CO3-Zhuangxi crude oil system or NPPS-Zhuangxi crude oil system. NPPS was of a good synergistic effect with Na2CO3, and only 0.0025 % (mass fraction) NPPS was needed to lower interfacial tension of oil water to 10 4 mN/m in the system of Na2CO3-NPPS-Zhuangxi crude oil when more than 0.35 % mass fraction of Na2CO3 was added.