考虑应力敏感性的页岩气产能预测模型  

Productivity Prediction Model of Shale Gas Considering Stress Sensitivity

作　　者：邓佳[1] 朱维耀[1] 刘锦霞 张贞[1] 马千[1] 张萌 邓凯 马丽[5] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国石油集团长城钻探工程有限公司测井技术研究院,北京100176 [3]中海石油海南天然气有限公司工程部,海南洋浦578101 [4]海洋石油工程(珠海)有限公司,广东珠海519055 [5]中国石油天然气股份有限公司华北石化分公司,河北任丘062552

出　　处：《天然气地球科学》2013年第3期456-460,638,共6页Natural Gas Geoscience

基　　金：国家重点基础研究发展计划("973")项目"中国南方海相页岩气高效开发的基础研究"(编号:2013CB228002)资助

摘　　要：根据页岩气储层中气体的成藏机制及流动机理,综合考虑了解吸—吸附作用和应力敏感性对页岩气藏产能的影响,建立了考虑解吸、扩散及渗流综合作用的页岩气稳态流动模型,在不同边界条件下对控制方程进行求解,得到页岩气储层的压力分布及产能方程,分析了不同解吸量对地层压力和产量的影响,解吸量越大,地层压力下降越慢,产量和压力平方差呈线性关系。在此基础上建立了考虑应力敏感性的产能方程,分析结果表明随着渗透率变异系数的增大,储层的应力敏感性越强,产量逐渐减小,要合理控制压差,以防对储层造成损害。此模型对页岩气生产和后续研究具有重要指导意义。According to the gas accumulation mechanism and flow mechanism of shale gas reservoir,a math- ematical model of shale gas productivity prediction was established, considering the effect of desorption, dif- fusion and seepage flow in shale gas reservoir. The pressure distribution and productivity equation were ob- tained by solving the controlling equation under different boundary conditions. The results show that, the more the desorption quantity is,the slower the formation pressure decrease. The production and the pres sure square difference are linearly correlated. The productivity prediction model considering stress sensitivi ty was solved with new pseudo-pressure function. Production decreases with the increase of stress sensitivi- ty of shale gas reservoir,which guide that controlling the pressure difference reasonably is able to protect the reservoir from damage. The productivity prediction model in this paper provides a theoretical founda- tion for shale gas reservoir evaluation and development design.

关 键 词：页岩气 解吸 产能预测 数学模型 应力敏感性 

分 类 号：TE37[石油与天然气工程—油气田开发工程]