有水气藏单井水侵阶段划分新方法  

New Method of Aquifer Influx Status Identification for Single Well in Gas Reservoir with Aquifer Support

作　　者：李勇[1] 李保柱[1] 夏静[1] 张晶[1] 郭凯[2] 胡云鹏[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气股份有限公司天然气与管道分公司,北京100007

出　　处：《天然气地球科学》2015年第10期1951-1955,共5页Natural Gas Geoscience

基　　金：国家科技重大专项项目'高压气藏高效安全开发技术研究'(编号:2011ZX05015-002)资助

摘　　要：对有较强边底水能量气藏的开发来说,最担心的问题就是气井见水。气井见水会对地面工程处理造成麻烦,同时也会大大降低气井产能及气藏采收率。目前国内外使用的气井见水时间预测方法,常会因实际气藏非均质性等问题影响导致预测结果与实际情况偏差较大。在前人研究基础上,提出了一种采用气井实际产量及压力数据绘制的3种诊断曲线进行气井水侵阶段划分的新方法,通过3种诊断曲线均可将气井的生产划分为3个阶段——未水侵期、水侵初期及水侵中后期。通过该方法对现场实际井进行判断分析,可准确识别气井水侵阶段,确定有水气藏气井见水顺序,评价结果更符合实际情况,为后期气井产量调配提供了依据,保证了气田高效开发。For gas reservoirs with strong bottom or edge aquifer support,the most important thing is to avoid aqui- fer breakthrough in gas well. Because water production in gas wells not only results in processing problems in sur- face facilities, but also explicitly reduces well productivity and reservoir recovery. And there are lots of researches on prediction of water breakthrough time, but they are not practicable because of reservoir heterogeneity. This paper provides a new method with 3 diagnostic curves to identify aquifer influx status for single gas well,which is based on well production and pressure data. The whole production period of gas well can be classified into 3 periods based on the diagnostic curves：no aquifer influx period, early aquifer influx period, middle-late aquifer influx period. This new method has been used for actual gas well analysis,which can accurately identify gas well aquifer influx status and the water breakthrough sequence of all wells in the same gas field. And the evaluation results are very useful for well production rate optimization and gas field effective development.

关 键 词：气藏 水侵阶段 诊断曲线 划分方法 产量不稳定分析 

分 类 号：TE331.1[石油与天然气工程—油气田开发工程]