The research of crude oil and its polar fractions oil-water interfacial film dilational viscoelasticity has important significance to know the stability of crude oil emulsion. By interfacial expansion rheological determinator, the Gudao Crude oil and its fractions dilational viscoelasticity under different pH worth and dilational frequency was examined. The end result exhibits that the dilational modulus of Asphaltene, Resin, Crude oil and Oil fraction decreased step by step underneath completely different dilational frequency and pH value, which has a relationship with polar groups within the crude oil and its Petroleum Refining Equipment fractions. When pH worth was different, crude oil and its fractions dilational modulus and dilational frequency was related. Dilational modulus elevated with the increases of dilational frequency, but rising amplitudes have been different. Underneath the identical pH value, dilational viscosity and phrase angle of Crude oil and its fractions had been decreased with the rise of dilational frequency. The affect diploma on completely different fractions was completely different, the influence degree of Oil fraction of dilational viscosity and phrase angle was small, Asphaltene was large. The dilational elasticity of Crude oil and its fractions elevated with the increase of dilational frequency. Beneath completely different dilational frequency, the dilational modulus of Crude oil, Resin and Asphaltene elevated with the rise of pH value, and it had no affect on dilational modulus of Oil fraction. The whole dilational elasticity tendency of Crude oil, Resin and Asphaltene was enhance, while dilational elasticity of Oil fraction decreased with the increases of pH worth. The variation of dilational elasticity and phrase angle of Crude oil and its fractions was comparatively advanced.

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