| Because of the specialty of the super Ultra-heavy oil property of the Liaohe oilfield Shu 1 block, the production declines rapidly after the huff and puff in the development of this block and the annual production decline rate is 20% or so. According to the problems of the high huff runs and worsing development effect in the middle-late stage of this Ultra-heavy oil reservoir, we developed"carbon dioxide + sulfonate + steam combined stimulation technology", and the application of this technology has formed certain scale in this block and the effect is notable. But there are still some theory deficiencies, we eagerly need to systematically study its production increase mechanism in order to combine with this block's development characteristics to optimize the scope of the selection of the oil wells and the operation parameters and also to guide the on site operation with this theory and to further enhance the application effect. This article starts with the reservoir characters,oil property,actual production conditions and other factors of this block, with the study of physical simulation and numerical simulation, to finally optimize the oil wells'selection scope and technology parameters and based on this we can guide the on site application and enhance the measure effect.Through the physical simulation test and the study of the production increasing mechanism of carbon dioxide combined huff, we want to find the key factors of this tech effect. The result of the test indicates that there are three combined huff mechanisms: enhancing the reservoir producing degree,decreasing the oil viscosity,dissolution displacement effect.With the consideration of the characters of the reservoir, the numerical simulation study was carried out. The reservoir heating efficiencies by steam and by carbon dioxide combined huff,cycle production and economic benefit were also forecasted, therefore the best injection mode and volume,late stage production and other kinds of technical parameters...
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