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针对特高含水期开发阶段,对剩余油潜力通常采用的采出程度等几项指标具有一定局限性的问题,提出通过与油藏数值模拟相结合,以模型的网格节点为基本统计分析对象,以储层渗流理论为基础,围绕能更具现实意义的剩余可动油描述,根据含油饱和度变化与采出程度的理论关系,建立网格节点的剩余可动油数值的求解方法;其次,针对相同含油饱和度是不同物性储层的流体含油率存在差别的情况,应用分流相理论确定网格节点流体含油率的求解办法,并将其与剩余可动油量相关联,量化描述储量潜力的品质;进一步应用数理统计学的基本方法,以每个沉积单元为分析对象,综合油层平面发育程度,以沉积单元方差值量化表征网格节点平面分布状况。从而精细分析水驱剩余油潜力,更有利于指导特高含水期油田开发调整挖潜。
In view of the limitation of several indicators, such as the degree of recoverable normally used for the potential of remaining oil during the development stage of the ultra-high water-cut stage, the paper proposes that the mesh nodes of the model be used as the basic statistical analysis object by combining with numerical simulation of reservoir. , Based on reservoir seepage theory, around the more realistic description of the remaining movable oil, according to the theoretical relationship between the change of oil saturation and the degree of recovery, the method for solving the remaining movable oil number of grid nodes is established. Secondly , For the same oil saturation of oil reservoirs with different physical properties of oil reservoirs there are differences in the situation, the use of split-phase theory to determine the grid node fluid oil content of the solution, and associated with the remaining amount of movable oil, quantitative description of reserves Potential quality. The basic method of mathematical statistics is further applied. Taking each sedimentary unit as the analysis object, the planar distribution of the grid nodes is quantitatively characterized by the variance value of the sedimentary units by integrating the plane development degree of the reservoir. Therefore, the potential of residual oil in waterflooding can be analyzed carefully, which is more conducive to guiding the development and adjustment of potential oilfields in the period of ultra-high water cut.