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依据低渗透油藏菱形反九点压裂井网不同流动区域的流动规律,建立了反映压裂开采过程物理本质的三区模型,推导出了考虑启动压力梯度的基质非达西渗流、椭圆渗流和裂缝非线性流动的三区两相渗流数学模型。研究表明:裂缝越长,累积产量越高,含水率增加越快;裂缝的导流能力越低,其累积产量越小,含水率也越小,随着导流能力的增加,累积产量的增加幅度变小;注水井排与裂缝的夹角对产量的影响不大;井排距对产量影响明显,对压裂井应采取较大的井排距。
A three-zone model reflecting the physical nature of the fracturing and mining process was established based on the flow patterns in different flowing areas of the diamond-shaped anti-nine-point fracturing well in low permeability reservoirs. Non-Darcy flow and elliptic flow were deduced considering the starting pressure gradient. And three-zone two-phase seepage flow mathematical model of nonlinear crack propagation. The results show that the longer the fractures, the higher the cumulative production, the faster the moisture content increases. The lower the conductivity of fractures, the smaller the cumulative production and the smaller the water content. With the increase of diversion capacity, the cumulative production increases The smaller the amplitude is; the angle between the injection well row and the crack has little effect on the yield; the well spacing has a significant effect on the yield and a larger well spacing should be adopted for the fracturing well.