Abstract
The phenomena in an oil reservoir during the super-wet combustion were experimentally investigated and evaluation of the super-wet combustion as an EOR from a technical point of view was carried out.First of all, the formation of stable wet oxidation reaction zone was experimentally confirmed in a combustion tube, when the ratio of oxygen and water injection rates were appropriately set. The result shows that two different types of flooding mechanism exists and oxygen/water injection ratio dominates the phenomena. That is to say, when much oxygen is supplied, the temperature goes up to the saturation temperature of water and generates steam which easily flows in a gas phase. In this case, steam flood may be the dominant mechanism to displace oil. On the other hand, the displacement of oil by hot water may be the major mechanism, if oxygen supply is not sufficient to generate much steam.Secondly, from the technical viewpoint, feasibility of both mechanisms for EOR was discussed. As a result, in the case of both types of flood, steam and hot water, it was found that the incremental oil recovery was 15-30 percent of the original amount of oil in the reservoir. This result shows that the super-wet combustion is a possible EOR technique.
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