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依据低渗透油田压裂开发过程中流体在不同流动区域内的不同流动特征建立了基质渗流区、裂缝控制区及裂缝的三区物理模型.建立了三区耦合理论模型:基质渗流区内依据平面径向非定常渗流规律建立了考虑启动压力梯度的非达西渗流模型;裂缝控制区内依据扰动椭圆建立了基质-裂缝耦合的椭圆渗流模型;裂缝内依据二项式渗流模型建立了高速非线性流动模型,推导出了低渗透油藏不同压裂井网两相渗流数学模型.试验区不同压裂井网开发效果分析表明:菱形反九点井网的开发效果最佳,其次是矩形井网、正反九点井网,正五点井网开发效果最差.
Based on the different flow characteristics of fluids in different flow areas during the fracturing development of low permeability oilfields, the physical model of the three zones of the seepage zone, the crack control zone and the fractures is established. A three-zone coupling theory model is established: A non-Darcy flow model considering the start-up pressure gradient is established, and a matrix-fracture coupled elliptical seepage model is established according to the perturbed ellipse in the fracture control zone. According to the binomial model, a high-speed non-linear Flow model, the mathematic model of two-phase seepage in different fractured well patterns of low permeability reservoirs has been deduced.The analysis on the effect of different fractured well patterns in the pilot area shows that the diamond reverse nine dot pattern is the best, followed by the rectangular pattern , Positive and negative nine well pattern, positive five well pattern development effect is the worst.