疏松砂岩储层窜流通道平面分布规律研究
Study on Two Dimensional Channeling Distribution of Unconsolidated Sandstone Reservoir

摘要： 国内大部分高含水油田，注入水窜流现象较为严重，已成为影响油田高效开发的主要矛盾，对窜流通道形成后渗透率场的计算与描述显得尤为迫切和重要。目前窜流通道参数计算方法，只能计算得到注采井点的渗透率数值，不能计算得到注采井间的渗透率分布状况，并且目前窜流通道渗透率计算方法没有将室内实验结果、数值模拟结果和油藏工程方法结果有效结合起来。以国内某高含水油田为例，通过长期注水冲刷实验，模拟了窜流通道的动态形成过程，归纳出了储层岩石注水冲刷倍数与渗透率之间的关系式。在常规数值模拟计算方法的基础上，将渗透率变化规律模型引入到数值模拟计算中，建立了计算窜流通道平面分布的新方法。以海上某油田的地质模型为基础，计算得到了该油田目前状态的窜流通道渗透率平面二维分布规律。综合对比动态数据法、概率密度模型法、经验公式法和示踪剂测试结果，证明本方法得到的结果真实可靠。
Abstract: The injection water channeling phenomenon is more serious in most of the high water cut oil fields. The injection water channeling phenomenon has become the main contradiction in the effective development of the oil field. The channeling formation permeability calculation and description method are particularly urgent and important. At present the channeling permeability calculation methods can only calculate the channeling permeability at injection and production well point, cant get the channeling permeability distribution between injection production wells. The calculation method is relatively isolated, and there is no effective combination of the experimental results, the numerical simulation results and the reservoir engineering method results. In this paper, through the longterm water injection experiment, the dynamic formation process of the flow channel is simulated. And the relation formula between the water injection erosion ratio and the permeability of the reservoir is concluded. On the basis of the conventional numerical simulation method, the permeability variation law model is introduced into the numerical simulation calculation, and a new channeling distribution of unconsolidated sandstone reservoir is established, and the two dimensional distribution of permeability in the current state of the oil field is obtained. By comparing the dynamic data method, the probability density model method, the empirical formula method and the tracer test results, the results of this method are proved to be reliable