A New Model For Calculating Oil-water Relative Permeability Of Fracture Network System

Now with people's growing demand for energy,the focus and recognition degree of fractured carbonate reservoir development is also increasing.And it is well known that the matrix permeability of fractured reservoir is low,and the horizontal and vertical heterogeneity is strong,so that it makes the huge difference of seepage characteristics and the mechanism of seepage is very complex,so it is too difficult to obtain the relative permeability data.And the oil-water two-phase relative permeability curve of fracture formation is regarded as the one of the most key parameters of the reservoir evaluation and oil-gas field development.Although some scholars have put forward some methods of calculating relative permeability,there is no study of oil and water relative permeability for complex fracture network system.Therefore,this thesis in view of the research of the relative permeability curve for the complex fractured reservoir has very realistic significance.In this thesis,the main study object is the calculate model of the relative permeability curves for the fractured reservoir.And considering the basic equation of fluid motion,together with the Darcy's law and the Newton's law of viscosity,this thesis aims to present a set of the new calculate model of oil-water relative permeability about the fracture network system by using the theory of permeability synthesis method of reservoirs.The research results obtained are mainly as follows:(1)According to the basic equation of fluid motion,this thesis has presented the calculate model of oil-water relative permeability of the single fracture,and based on the experimental results to correct the model,at the same time analyzes the influence factors.(2)According to the calculate model of oil-water relative permeability of the single fracture,together with the Darcy's law and the theory of permeability synthesis method of reservoirs,this thesis has presented the calculate model of oil-water relative permeability of the parallel combined fracture system,and then analyzes the influence factors.(3)According to the calculate model of oil-water relative permeability of the single fracture,together with the Darcy's law and the theory of permeability synthesis method of reservoirs,this thesis has deduced the calculate model of oil-water relative permeability of the parallel and inclined fracture system and many layers fracture system,and then analyzes the influence factors.In this thesis,through the in-depth study of the calculate model of oil and water relative permeability curve about different network system,has made clear the influence of various factors to the oil-water percolation mechanism in fracture system,meanwhile it also provides theoretical guiding about the oil and water flow law in the complex fracture reservoir.