Study On Characteristics Of Gas Tracer Diffusion Between Wells In Heavy Oil Reservoir

Gas tracer starts to be used relatively late in the development of our country,and it is now often used in the interpretation of the miscible flooding reservoir.For the heavy oil reservoir using steam flooding,the method of interpretation is immature.In order to further understand the distribution of remaining oil saturation and the production dynamic in the heavy oil reservoir using steam flooding,and to adjust the injection-production plan handily,this paper establishes a model which is suitable for the heavy oil reservoir using steam flooding.This paper introduces the common chemical gas tracer used in the oil field and the main differences between the gas tracer and the liquid.Then the screening method of the gas tracer is established for the heavy oil reservoir in this paper,and the main function of gas tracer in heavy oil reservoirs is introduced followed by.Based on the understanding of the movement of gas tracer in reservoir and the mechanism(including the distribution and the stagnation)of the gas tracer showed in the physical experiment,assuming that the gas tracer reaches to the equilibrium distribution very quickly in the two-phase system,considering the flow of gas tracer in reservoir field,the diffusion equation is built at the existence of the distribution and the stagnation with the mass diffusion theory as a foundation,and the slug flow is considered followed in a specific discussion.In this paper,the influence of the migration velocity of the oil is counted in based on the construction of the equation of the slug flow.The actual well network is composed of single flow pipe.Through the launched slug flow equation,the breakthrough model of the well is established corresponding to the gas tracer.In case of the breakthrough model with the influence of the oil migration velocity,CMG software is applied to analysis the conceptual model,which is verified by the mathematical model built above.The successful results show that the breakthrough model has a good fitting and a widely practical value.