基于灰色关联的逼近理想解排序法的煤层气井重复压裂选井——以沁水盆地柿庄南区块为例

针对煤层气井重复压裂选井研究较少的问题,利用灰色关联法求取影响煤层气井产量的各因素权重,在此基础上运用逼近理想解排序法(technique for order preference by similarity to ideal solution,TOPSIS)优选重复压裂井。选取储层物性、压裂施工等14个因素,定量计算14个影响因素对产量影响的权重,并将权重带到TOPSIS模型中对研究区块已进行重复压裂的6口井进行验证,根据6口候选井与理想解的贴近程度,确定了最具有潜力的2口井。优选出的重复压裂井压裂后实际产气效果与未被优选的重复压裂井产气效果相比,产气效果得到了明显的改善,证明了该方法的有效性,研究结果对煤层气重复压裂选井具有一定的借鉴意义。

Study on Multiple Fracturing Well Selection of CBM Wells based on TOPSIS Method of Gray Correlation---Taking the Case of Qinshui Basin Shizhuang South Block as Examples

In order to solve the problem of difficulty in selecting well for refracturing in CBM Wells, the grey correlation method is used to calculate the weights of various factors affecting the production of CBM Wells, and on this basis, the order method (TOPSIS) which is close to the ideal solution is used to select the multiple fracturing Wells. 14 factors such as reservoir physical properties and fracturing are selected. Quantitative calculation of the weight of 14 factors impact on the production, and the weight into the technique for TOPSIS to study blocks in the model has been validated in 6 Wells of repeated fracturing, according to the six candidate Wells and the degree of close to the ideal solution, identified the most promising 2 Wells. Compared with the unselected multiple fracturing Wells, the actual gas production effect of the optimized multiple fracturing Wells after fracturing is significantly improved, which proves that this method can effectively select the multiple fracturing Wells. This study has certain reference significance for the selection of coal bed methane multiple fracturing Wells.