The aquathermolysis of Shengli extra-heavy oil during steam stimulation was studied by using anamphiphilic molybdenum chelate-aromatic sulfonic iron as catalyst for the reaction in this papers. The laboratory experiment shows that the viscosity reduction ratio of heavy oil is over 97.15% at 200°C, 24 hr, 0.2 % catalyst solution. The viscosity of upgraded heavy oil is changed from 524.5Pa·s to 14.95mPa·s at 50°C. The chemical and physical properties of heavy oil both before and after reaction were studied by using Fourier transform infrared (FT-IR) spectroscopy, gas chromatography/mass spectrometry (GC-MS), elemental analysis (EL). The percentage of saturate aromatic and H/C increased, and resin, asphalt and S, O, N decreased after the aquathermolysis. The changes of the composition and structure of the heavy oil can lead to the viscosity reduction and improve the quality of heavy oil. It has shown that the mechanism of aquahtermolysis is discussed further. We found the new mechanism of catalyst not only broken C-S bond, but also broken C-O and C-N bonds, and accelerated the reaction of aquathermolysis. The results are very useful for the popularization and application of the new technology for the insitu upgrading of heavy oil by aquathermolysis.

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