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

Multiple Fracturing Well Selection of Coalbed Methane Wells Based on Technique for Order Preference by Similarity to Ideal Solution Method of Gray Correlation:Taking the Case of Qinshui Basin Shizhuang South Block as an Examples

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。

In order to solve the problem of difficulty in selecting well for multiple fracturing in coalbed methane wells,the grey correlation method was used to calculate the weights of various factors affecting the production of coalbed methane Wells.On this basis,the technique for order preference by similarity to ideal solution(TOPSIS)was used to select the multiple fracturing wells.14 factors such as reservoir physical properties and fracturing were selected.Quantitative calculation of the weight of 14 factors impact on the production was conducted,and the weight into the technique for TOPSIS to study blocks in the model was validated in 6 wells of multiple fracturing.According to the six candidate wells and the degree of close to the ideal solution,the most promising 2 wells were identified.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.The research findings certain reference significance for the selection of coal bed methane multiple fracturing wells.