应用模糊综合评判和灰色关联度分析评价水平井多级压裂效果

水平井多级压裂是低渗透和非常规油气田开发的有效技术手段,其压后产能评价问题已成为相关研究的热点和难点.水平井多级压裂压后产能的各项影响因素之间关系复杂,通过常规理论分析量化研究困难,压裂效果很难准确预测.本文提出应用模糊综合评判和灰色关联度分析相结合的方法,对多级压裂水平井的压裂效果进行评价.首先运用灰色理论分析影响压裂效果的各因素之间的灰色关联度,计算各影响因素在综合评判中的权重值,再结合模糊综合评判方法,对多级压裂井压后效果进行预测评价.通过目的区块24口多级压裂水平井压后效果评价与实际生产情况对比,表明模型计算准确率达到95.8%,评价结果准确可靠.

Evaluating Multistage Fracturing Effect of Horizontal Wells Using Fuzzy Comprehensive Evaluation and Grey Relational Grade Analysis

Multistage fracturing of horizontal wells is an effective technique for developing low permeability and unconventional oil and gas resource.Evaluating its production capacity after fracturing has become a hot and difficult issue in related research field.The relationship between production capacity after fracturing and the affecting factors is complex,and conventional theoretical analysis quantitative research is difficult.Fracturing effect is difficult to predict accurately.In this paper,the fracturing effect of multistage fracturing is evaluated by the method of combining fuzzy comprehensive evaluation and grey relational grade analysis.Firstly,analyze the grey relational grade of the effects that affacts fracturing effect using grey theory,and calculate the weight value of the different effect factors in comprehensive evaluation.Secondly,predicting and evaluating the fracturing effect by combining fuzzy comprehensive evaluation method.Comparing the fracturing effect evaluation for 24 horizontal wells with actual production situation,showing that the accuracy rate of the model is 95.8%,the evaluation results are accurate and reliable.