Influential Factors And Technical Limits Of Layered Thermal Recovery In Heavy Oil Reservoir

In multilayer general steam injection production of heavy oil reservoir,because of the existence of interlayer difference,interlayer interference phenomenon will appear,new layer and old layer also have difference in using.In addition,there is obvious contradiction between high and low permeability layer,injecting steam has uneven distribution,too.Layered thermal flooding can overcome the problem of inequality using caused by the contradiction of different layers,which is significant for the development of multilayer heavy oil reservoir.According to the above problems,this paper made the following research: Firstly,through the analysis of the typical wells with layered thermal fooding,the effected factors and the problems need to pay attention to have been determined.Secondly,simulation analysis of the interlayer interference has been made,and the main cause and the key of the interlayer contradictions have been concluded.Thirdly,the limition of adaptabilitiy of layered thermal recovery has been determined in both single factor and comprehensive factors by using n?merical simulation method.Fourthly,injection parameter optimization of thermal recovery has been calculated with a specific optimization method.The research results show that flow interference exists when layerd thermal recovery method is used because of the resistance of the interlayer filtrational difference.What's more,heat interference also exists because of the thermal conductivity.The presence of these interferences causes the uneven distribution in general steam injection.In this thesis,the conclusion of the adaptability with two aspects is more universal.In addition,the method of the injection-production parameters optimization based on double objective optimization is more practical.