为了研究非均质油藏内部渗流规律,反映不同开发阶段地层中流体流动规律及分布特征,揭示流场变化与储层特征间的内在联系。本文基于水动力学原理及流线簇方程,提出储层中波及范围内具有相似流动规律及储层特征的渗流区域为微观流动单元,建立流量贡献率、流动单元流量非均匀分布曲线和流量强度差异系数渗流数学模型,通过流动单元的区域流量对总产量贡献的大小进行划分,建立流动单元高速流动区与低速流动区的划分准则。通过对五点井网一个注采单元的模拟,结合流线簇方程进行表征,结果表明,高速流动区能量充足,其占整个流动单元面积的53.7%,提供了总流量的61.7%,为流量的主要贡献区域;低速流动区域占整个流动单元总面积的46.3%,只提供了总流量的38.3%。
This paper studies the seepage law in heterogeneous reservoir to find out the flowing law and distribution of fluids at different development stages for revealing the internal relations between flow field and reservoir characteristics. Based on hydrodynamics theory and streamline cluster equation, this paper proposes that the seepage region which has similar fluid flowing law and reservoir characteristics is a micro- flow unit. The seepage flow mathematical model of the contribution rate of flow (CRF), nonuniform distribution curve of flow units (NDCFU) and the difference coefficient of flow intension (DCFI) has been established, and the principle for dividing high and low velocity flow area is based on the flow contribution rate of flow units. Simulation of constantrate water flooding dynamics in an injection-production unit of the inverted 5-spot pattern and plotting by means of streamline cluster equation show that the high velocity flow area had sufficient driving energy, occupying 53.7% of the entire flow unit area, but providing 61.7% of the total flow, and contributing most to the production. The low velocity flow area occupied 46.3% of the entire flow unit area, but only provided 38.3% of the total flow.
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