张磊,胡永全,张平,赵金洲,吴建光,孙晗森
ZHANG Lei,HU Yongquan,ZHANG Ping,ZHAO Jinzhou,WU Jianguang,SUN Hansen

• 1:西南石油大学油气藏地质及开发工程国家重点实验室
• 2:中联煤层气有限责任公司

摘要(Abstract)：

煤层气藏与常规砂岩气藏开发存在显著差别,压后生产特征及因素影响规律完全不同,沁水盆地各区块日产气量差异极大。综合考虑煤层气的解吸、扩散和渗流机理,建立了二维气/水两相的压裂煤层气井生产动态数学模拟模型,以1口实际井参数为例模拟分析了Langmuir体积、Langmuir压力、解吸时间、煤层压力、煤层裂隙渗透率和裂隙孔隙度对压裂煤层气井产量的影响规律。煤层气藏与砂岩气藏压后生产动态有明显区别,前者经历一定时间后还会出现产量第二峰值且该峰值可能大于产量第一峰值,产气量(含峰值产量)随Langmuir体积增加或Langmuir压力减小而增加,随煤层裂隙渗透率增加或裂隙孔隙度减小而增加。这些因素均会影响到峰值产量数值及其出现时间,研究结果对正确认识压裂煤层气井生产动态变化有重要意义。
There are significant differences in the developments of coalbed methane(CBM) and conventional sandstone gas reservoirs,and moreover the production characteristics and influencing factors after the fracturing are completely different,and furthermore the daily gas outputs of different blocks in Qinshui Basin vary seriously.Taking the CBM desorption,diffusion and osmosis mechanism into consideration,a two-dimensional and two-phase(gas and water) mathematical simulating model about the production dynamics of the CBM wells is established to analyze the impacting laws of Langmuir volume and pressure,desorption time,seam pressure,coalbed crack permeability and porosity on the productions of CBM wells.There are obvious distinctions between the production dynamics of CBM reservoir and sandstone gas reservoir after the fracturing:for the former,the second yield peak will appear after a certain development time,and moreover it may be higher than the first one,the gas production(including the peak production) rises with Langmuir volume increases or Langmuir pressure decreases,so does with the coalbed fracture permeability increases or fracture porosity decreases.All these factors affect the value and occurrence time of the peak production.The study achievements possess important significance for the correct understanding of the production performances of the fractured CBM wells.

关键词(KeyWords)： 沁水盆地;煤层气;数值模拟;生产动态;影响因素
Qinshui Basin;coalbed methane(CBM);numerical simulation;production performance;influencing/impacting factor

Abstract:

Keywords:

基金项目(Foundation): 国家重大科技专项“山西沁水盆地南部煤层气直井开发示范工程”(2011ZX05060)

作者(Author): 张磊,胡永全,张平,赵金洲,吴建光,孙晗森
ZHANG Lei,HU Yongquan,ZHANG Ping,ZHAO Jinzhou,WU Jianguang,SUN Hansen

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