重复压裂候选井多级模糊决策方法

重复压裂是油气田开采后期增产稳产的一个重要措施。但是，目前的重复压裂效果不很理想，具体表现在：压裂后增产幅度小，含水上升，产量递减速度快，有效期短，有效率低。因此有必要对重复压裂候选井进行优选。而影响重复压裂效果的因素众多，可以分为：地层物性、产能、原油物性、工程因素四大类。而每一大类中又可细分为很多影响因素。因此，常规的单一目标函数方法不能用于该类问题。将系统工程理论中的层次分析法和多级模糊决策方法结合起来并应用于重复压裂候选井的评判上，对中原油田的7口井进行了优选。实践表明：该方法克服了以往重复压裂候选井选层的盲目作法，并且综合考虑了候选井的多个影响指标，因而更加合理。

Refracturing Candidate Well Multilevel Fuzzy Decision Method

Refracturing is an important measure to increase and stabilize production at the later stage of oil/gas field development.However,the current refracturing effect is not very ideal,with the following manifest: small production increase after fracturing,water cut increase,fast production decline,short effective period and low efficiency.Therefore,it is necessary to optimize the refracturing candidate wells.There are many factors to affect the effect of refracturing,classified into four categories: formation property,production capacity,oil property,and engineering factors.Each category can be subdivided into many influential factors.Therefore,the conventional single target function method can not be used in this type of issue.By combining hierarchical analysis with multilevel fuzzy decision making method in system engineering theory in the judgement of refracturing candidate wells,seven wells in Zhongyuan Oil Field are optimized.The practice indicates that this approach can overcome the blindness of the conventional refracturing candidate wells layer selection and can integrate many influential indexes of the candidate wells,thus is more reasonable.