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根据射孔完井的渗流特点,利用有限元方法建立了三维单相非稳定渗流的数值模型,有限元方程组的求解是在曙光1000大型并行机上利用区域分解法进行的。利用非稳定渗流方程进行油田射孔产能的研究,克服了稳定渗流方程的局限性和外边界的不确定性。通过各种射孔方案的计算,给出了射孔深度、射孔半径、射孔密度、射孔相位、污染程度和厚度、压实程度和厚度等射孔参数对油井产能影响的曲线,这些结果对油田制定射孔方案具有一定的指导意义。
According to the percolation characteristics of perforation and completion, a numerical model of three-dimensional single-phase unsteady seepage was established by using finite element method. The solution of finite element equations was performed by using the area decomposition method in Dawning 1000 large-scale parallel machine. The study on perforation capacity of oilfields by using the unsteady seepage equation overcomes the limitations of the steady seepage equation and the uncertainty of the outer boundary. Through the calculation of various perforation schemes, curves of perforation parameters such as perforation depth, perforation radius, perforation density, perforation phase, pollution degree and thickness, compaction degree and thickness on well productivity are given The results have certain guiding significance for the formulation of perforation schemes in oilfields.