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地层污染包括两种情况。一是压裂前井底附近地层受泥浆等的污染;二是压裂后裂缝壁面周围地层受压裂液的污染。本文从地层系数和填砂裂缝导流能力不均匀的基本情况出发,导出了水平裂缝压裂产率比的一般计算公式。然后应用于两种地层污染和加尾砂等实际情况,讨论和分析了压裂前地层污染对产率比估价的影响和压裂后地层污染对压裂效果的影响。与前人水平缝压裂产率比电模拟实验曲线进行比较,提出了本文方法的适用范围。
There are two types of formation contamination. First, before the fracturing of the formation near the bottom of the mud and other pollution; second is fractured fracturing wall fracturing fluid around the formation of pollution. In this paper, based on the basic situation of formation coefficient and uneven infiltration ability of sand fissure, the general formula of fracturing productivity ratio of horizontal fissure is deduced. Then it is applied to the actual situation of two kinds of formation pollution and tailing sand. The influence of the formation pollution before fracturing on the evaluation of the production rate and the effect of formation fracturing after fracturing on the fracturing effect are discussed and analyzed. Compared with the previous experimental results, the proposed fractal yield rate is higher than that of the electric simulation experiment curve, and the applicable scope of this method is proposed.