澳大利亚中煤阶煤层气水平井产气峰值特征及影响因素研究  

Australia mid coal rank CBM horizontal well gas peak rate feature and influencing factors study

作　　者：孙华超[1] 夏朝辉[1] 李陈[1] 耿愿 胡云鹏[1] 

机构地区：[1]中国石油勘探开发研究院,北京市海淀区100083

出　　处：《中国煤炭》2015年第3期132-135,共4页China Coal

基　　金：国家重大专项--海外重点风险项目勘探综合配套技术(2011ZX05029)

摘　　要：煤层气水平井产气峰值大小及到来时间是产能高低的重要标志,由于国内缺乏具有较长稳定产气历史的煤层气田而鲜有相关研究。以澳大利亚M煤层气田为研究对象,首先分析了峰值大小和到来时间的分布特征,发现峰值大小与峰值到来前的平均日产气呈现极好的相关性,且高产井峰值到来时间基本都低于600天。其次,通过数值模拟研究,得出含气饱和度、割理孔隙度、储层厚度、解吸时间、含气量和渗透率对峰值大小的影响依次增大;而峰值到来时间仅受解吸时间及割理孔隙度影响显著。研究成果为项目后续的单井产能评价工作奠定了基础。The peak gas rate and the time it reaches are two important indications for coal bed methane （CBM） well gas production curve. While in China, there is few corresponding stud- ies because of no long-time production CBM gas fields. This paper takes M CBM gas field of Aus- tralia as research object. Firstly, the peak gas rate and the producing time before it comes of pro- duction wells are researched, it is found that the peak gas rate shows very excellent accordance with the average daily gas rate before it gets to the peak, which gives people important inspiration for CBM well productivity evaluation. Secondly, numerical simulation method is taken to further study influencing factors of the peak gas rate and the time it reaches. The results show that the influencing sensitivity intensity from strong to weak is permeability, gas content, desorption time, net coal thickness, cleat porosity and gas saturation. The time when peak gas production reaches is only markedly influenced by the value desorption time and cleat porosity, The research results can be served as firm foundation for the whole project＇s subsequent EUR evaluation.

关 键 词：煤层气 产气峰值 影响因素 

分 类 号：TE37[石油与天然气工程—油气田开发工程]