On The Studies About The Synergistic Mechanisms Of SCC Action For Heavy Oil

The steam/carbon dioxide/chemical catalysis composite stimulation technology is not yet used in oil field site, its synergistic effect and synergistic mechanisms are not clear, cannot provide guidance for the design of process parameters. Based on this, on the basis of analysis mechanisms of steam stimulation technology, carbon dioxide technology, catalytic cracking technology, the paper by relevant physical model, using laboratory research method, studies about the synergistic mechanisms of SCC action for super heavy oil. First, under a separate action,studied the super-heavy oil steam/CO₂/catalyst static viscosity reduction evaluation and mechanism of action. Second, through CO₂ and catalyst under different composite way static viscosity effect experiment analysis found that: adding CO₂ into catalytic reactions, CO₂ inhibits the catalytic reaction of WGSR, the hydrogen production decreased; acidic environment formed by CO₂ aqueous can promote the polymerization of the acid; extraction of light components of the role of CO₂ significantly reduced the effect of cracking. Oil samples dissolved CO₂ after catalytic found: due to reduced heavy hydrocarbon component content of oil sample after catalysis, light hydrocarbon components increase, CO₂ solubility can increase 10²0m3/m3, viscosity reduction rate increased to 94.6%, higher than the rate of viscosity reduction of 84% saturated with CO₂ alone 10.6%. Third, focus on the steam/Carbon dioxide/catalyst, under the effect of improving stimulation oil recovery of the three complex factors affecting. The results showed that: Carbon dioxide + isolation steam + catalyst + replace steam injection slug is the best way for EOR; Steam injection rate increases, it enhanced roles of seepage agitation, promoting contacted and mixed with carbon dioxide, catalysts and crude oil in porous media; The main mechanisms of enhanced oil recovery under different temperatures, in the low temperature conditions（<200℃）, EOR mainly based on the expansion of steam heat and the role of viscosity reduction of dissolved CO₂, under high temperature conditions（>200℃）, EOR mainly based on steam thermal and catalyst cracking role and the role of CO₂ free gas. Finally, the above analysis and laboratory experiments, explore the composite stimulation of heavy oil SCC synergistic role of viscosity reducing and mixing with mass transfer mechanisms for EOR. For field application provides some theoretical guidance.