关键词: 窜流通道, 渗透率变化, 数值模拟, 注水冲刷, 参数计算

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.

Key words: channeling, permeability variation, numerical simulation, injection water flooding, parametercalculation