基于适配关系的高含水油藏流场调控优化方法

Optimization method of flow field control in high water cut reservoir based on matching relationship

卜亚辉

BU Yahui

中国石化胜利油田分公司勘探开发研究院，山东 东营 257015

Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

文中以高含水油藏为研究对象，根据渗流力学原理分析了流场参数间的相互影响关系，明确压力场、速度场、饱和度场是流场表征的最佳物理量。建立了注采井间压力场、饱和度场三维曲面演化模型，分析了不同含水阶段两场演化规律；明确了水驱流场最理想状态并不是个别井点位置压力的提高，而是整个压力斜面的抬升，斜面斜率越大，流场驱替作用越好。提出了压力场与饱和度场适配关系定量评价方法，揭示了适配系数随开发演化的4个阶段。水驱开发是一个从“适配”到“失配”，经过流场调整后重建“适配”的反复过程；高含水油藏流场的压力场需要经常调整，以适应不停变化的饱和度场，才能取得更好的开发效果。通过批量数值模拟，建立了适配系数与累计产油量之间的相关性，并提出了一种基于适配系数的流场调控优化方法。该方法可通过较少计算量更快地获得较优的调控方案，经模型测试优化，效率提高40%以上。

Taking high water cut reservoir as the research object, according to the principle of seepage mechanics, the interaction relationship between flow field parameters is analyzed. It is clear that pressure field, velocity field and saturation field are the best physical quantities for flow field characterization. The three-dimensional curved surface evolution model of pressure field and saturation field between injection and production wells is established, the evolution laws of two fields in different water cut stages are analyzed, and it is clear that the best state of water drive flow field is not the increase of pressure at individual well points, but the rise of the whole pressure slope. The larger the slope, the better the displacement effect of flow field. The quantitative evaluation method of the matching relationship between pressure field and saturation field is proposed, and the four stages of the evolution of the matching coefficient with development are revealed. Water drive development is a repeated process from match to mismatch and then reconstruction of match after flow field adjustment. Therefore, the pressure field of high water content field needs to be adjusted frequently to adapt to the changing saturation field in order to achieve better development effect. The correlation between matching coefficient and cumulative oil production is established through batch numerical simulation, and a optimization method of flow field control based on matching coefficient is proposed. This method can obtain a better control scheme faster with less calculation, and the efficiency is improved by more than 40% through model test optimization.

10.6056/dkyqt202205019