基于多方法融合的低产低效气井优选

Optimization of Low-Production and Low-Efficiency Gas Wells Based on Multi-Method Fusion

随着致密气田的深入开发,低产低效井逐年增加,已经成为制约气田开发的关键问题之一。以苏里格气田某区块30口气井为研究对象,引入产量贡献率作为动态分类指标,运用气井产量贡献率累计分布曲线的类分割点将气井划分为4类。以纵向合采砂体数、有效砂体厚度、孔隙度、渗透率和含气饱和度等参数作为静态评价指标,采用熵权-理想点法,对气井进行静态分类。基于动态和静态分类结果,引入自相关距离判断异常值点,进行低产低效气井优选。研究表明,Ⅰ、Ⅱ、Ⅲ、Ⅳ类气井的储层质量依次变差,累计产量依次减小;4口气井为低产低效井,优选结果符合生产实际。该研究成果可为气田进一步挖潜的选井、选层提供一种新的技术途径。

With the further development of tight gas fields,low-yield and low-efficiency wells are increasing year by year,which has become one of the key problems restricting the development of gas fields.Taking 30 gas wells in a block of Sulige gas field as the research object,this work introduced the production contribution rate as the dynamic classification index,and divided the gas wells into four categories by using the class split point of the cumulative distribution curves of gas well production contribution rate.The number of longitudinal co-exploited sand body,effective sand body thickness,porosity,permeability and gas saturation were used as static evaluation indexes,and the entropy weight-ideal point method was utilized to classify gas wells.Based on the dynamic and static classification results,the autocorrelation distance was introduced to judge the abnormal points and optimize the low production and low efficiency gas wells.Results show that the reservoir quality of class Ⅰ,Ⅱ,Ⅲ and Ⅳ gas wells deteriorates successively,and the cumulative production decreases successively.Four gas wells are low-production and low-efficiency wells,and the optimized results are in line with the actual production.The research results can provide a new technical way for well selection and layer selection for further exploration of gas fields.