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首页> 美国政府科技报告 >Low Interfacial Tension and Miscibility Studies for Surfactant Tertiary Enhanced Oil Recovery Processes. Final Report, December 1980-September 1981
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Low Interfacial Tension and Miscibility Studies for Surfactant Tertiary Enhanced Oil Recovery Processes. Final Report, December 1980-September 1981

机译：表面活性剂三次强化采油过程的低界面张力和相容性研究。最终报告，1980年12月至1981年9月

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The main purpose of this project is to develop an improved basic understanding of how ultralow interfacial tensions arise in oil-brine-surfactant systems. Such tensions must be achieved and maintained during tertiary oil recovery processes if they are to be successful. The effects of temperature and of divalent ion concentration on the structure of aqueous surfactant solutions have been determined. As temperature increases, the salinity range where liquid crystalline phases exist is narrowed. At sufficiently high temperatures the liquid crystal melts and only isotropic phases are observed. These are an aqueous phase and, when partial immiscibility of alcohol and brine occurs, an alcohol-rich phase as well. The effect of divalent ions on aqueous solution structure is basically the same as that of monovalent ions, but smaller quantities of divalent ions are needed to bring about the same phase changes. In the particular system studied addition of one mole of Ca exp +2 was equivalent to addition of about 11.5 moles of Na exp + . The model of drop size in microemulsions has been extended to include the effects of drop dispersion. A hard sphere model was used to describe dispersion effects. With dispersion, drop size is slightly smaller for both oil-continuous and water-continuous microemulsions than predicted by the previous analysis which considered film properties alone. Further work on the proposed scheme for reducing microemulsion sensitivity to salinity changes is included in an Appendix. (ERA citation 07:049211)

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