KS油田高含水后期调剖堵水选井

KS油田开发进入高含水期后,注水井调剖是常用的稳油控水措施,但是在选井决策方面,存在指标界限不易选择、权重数值不易量化等问题.针对上述问题,筛选出能够较准确反映水窜特征的单井指标、井间指标和静态指标,构建基于多项式核函数、径向基核函数和Sigmoid核函数的新型核函数,并基于函数形式优化模糊聚类方法,提高拟合精度和预测...

Selection of Wells for Profile Control and Water Plugging in Late High-Water Cut Stage in KS Oilfield

In the late high-water cut stage in KS oilfield, profile control in water injection wells is a common measure to stabilize oil production while controlling water production. However, it is difficult to decide index limits and quantify weight values when selecting water wells. This study screened single-well, interwell and static indicators that can accurately reflect the characteristics of water channeling, developed a new kernel function based on polynomial kernel function, radial basis kernel function and Sigmoid kernel function, and optimized the fuzzy clustering method to improve the accuracy of fitting and prediction. Then a special fuzzy clustering method was proposed for selecting wells for profile control in the late high water-cut stage in KS oilfield. It can improve the recognition rates of sample set and detected set for selected wells. The new decision-making method for selecting wells for profile control has been applied to KS oilfield, and 3 wells were selected from 22 water wells for profile control. Significant oil increasing and water reducing effects have been achieved.