Upgrade and Viscosity Reduction of Extra-Heavy Oils by Aquathermolysis
In the course of steam injection, the synthetical function of water and heat cause the crude oil physical change and chemical reaction of aquathermolysis. The CO and H<,2>O produced in the aquathermolysis can be change into H<,2>. The content of saturated hydrocarbon and aromatic hydrocarbon of stratum oil are increased by the hydrodesulfurizing reaction between H<,2> and super viscous oil, so the modification and viscosity reduction of crude oil could be advanced. The catalyst has definite stimulation for the aquathermolysis of crude oil. The amount of H<,2> produced by water-gas is less in the process of crude oil catalytic aquathermolysis reaction, which can not satisfy the requirement of super viscous oil hydrodesulfurizing reaction. If the hydrogen donor is added into the reaction system, it could supply the H<,2> required in the crude oil hydrodesulfurizing reaction. It could also restrain the condensation and coke trend in the process of aquathermolysis. Furthermore, it can accelerate the forward reaction of hydrodesulfurizing and enhance the crude oil aquathermolysis. An aquathermolysis technique using hydrogen donors was studied for the upgrade and viscosity reduction of extra-heavy oils via a steam injection process. The effect of adding hydrogen by hydrogen donors in aquathermolysis reactions has been analyzed through experiments. The experimental results indicate that the combination of hydrogen donors and catalysts, their types and dosage have a great impact on the aquathermolysis reactions at simulated steam injection conditions. Among the hydrogen donors tested, tetralin was found to be the best for the aquathermolysis reaction of the oil studied. The combination of tetralin and nickel sulphate (as a catalyst) has a synergic effect to the reactions. The content of S in the oil has a great effect on the aquathermolysis reactions;high S content can promote thermolysis reactions. Influence of reaction, temperature, duration and addition of water in aquathermolysis reactions have been analyzed through experiments. The dosage of 5％~10％ tetralin as hydrogen donor and 0.08％~0.10％ nickel sulphate as catalyst was found to be a proper combination to facilitate the aquathermolysis reactions of extra- heavy oil from Shengli Binnan oilfield, and 10％~30％ water content (mass％ to oil) is appropriate for the oil system studied. The aquathermolysis experiments under a simulated reservoir condition of steam injection process, using the extra-heavy oil samples from Shengli Binnan oilfield, show that the viscosity of the oil can be reduced more than 70％ after the aquathermolysis reaction via mixing the hydrogen donors and catalysts. The contents of asphaltene and sulfur in the oil were also reduced, while the H/C ratio of the oil increased after the reactions.
Z. X. Fan J. X. Wang S. R. Ren
China University of Petroleum, Dongying 257061, China
国际会议
首届世界重油大会(The Technical Sessions of the First World Heavy Oil Conference)
北京
英文
1138-1139
2006-11-12（万方平台首次上网日期，不代表论文的发表时间）