Discrete Fracture Network Modelling And Numerical Simulation For Fractured Low Permeability Reservoirs With CO₂ Injection

Fractured low permeability reservoir is a kind of important reservoir. The development of the fractured low permeability reservoir makes the numerical simulation for this kind of reservoir more important. The difficult of the numerical simulation for fractured low permeability reservoirs with CO₂ injection lies in two aspects: the Characterization of fractures and the flow simulation of CO₂ within fractures. The description model of fractures includes: Discretemodel and Continuous model. This papercan be divided intotwoparts: Discrete Fractures Network Modeling and Dual Media Numerical Simulation for Fractured Low Permeability Reservoirs with CO₂ Injection. At the first part, the Discrete Fractures Network is built by combing the large scale discrete fractures network and the small scale discrete fractures network, the large scale discrete fractures network is got by using the Ant Trace Algorithm, and the small scale discrete fractures network can be stochastically generated based on the statistic probability model of different fracture properties, which come from the analysis of image logging, finally the Discrete Fractures Network is transformed to be EquivalentPorous Mediumthrough Oda method. At the second part, the dual media compositional numerical model is used to simulate the porous media flow of CO₂ within fractured reservoir, all factors that may affect the effect of this EOR method is analyzed through the Orthogonal experiment method, and the best CO₂ injectionprogram is found.