涪陵页岩气X井裂缝网络参数对产能的影响  

Influence of fracture network parameters on productivity of shale gas well X in Fuling block

作　　者：侯腾飞[1] 张士诚[1] 马新仿[1] 邵俊杰[1] 李栋[1] 贺雨南 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249

出　　处：《深圳大学学报（理工版）》2016年第4期409-417,共9页Journal of Shenzhen University(Science and Engineering)

基　　金：国家重点基础研究发展计划资助项目(2013CB228004);国家自然科学基金资助项目(51504266)~~

摘　　要：通过水平井缝网压裂技术实现涪陵地区页岩气藏的页岩气商业规模化开采.结合岩石力学分析和油藏数值模拟,对水平井缝网形态学、裂缝密度、裂缝方位和裂缝非均匀铺砂等进行研究.结果表明,裂缝方位与井筒夹角为90°时产气量最大;网络裂缝等长时气井采出程度最高,两边长中间短的裂缝形态次之,储层改造体积小的裂缝形态压裂效果最差;同样的改造区域,裂缝密度越大,压裂效果越好,压裂时需沟通微裂缝,形成网络裂缝;非均匀铺砂对页岩气井产能影响大,高浓度均匀铺砂比低浓度均匀铺砂产能高,非均匀铺砂产能居于两者之间,模拟显示每条裂缝产气量差异较大.Commercial shale gas production is achieved by using horizontal network fracturing techniques in the Fuling shale gas reservoir. Combining pock mechanics analysis and numerical reservoir simulation, we investigate the effects of horizontal fracture network morphology, fracture density, fracture orientation and uneven proppant distribution on the performance of well productivity. The results show that the gas well with equal-length fractures has the highest value of recovery factor, followed by the case with longer fractures on sides but shorter in the middle. Moreover, the worst fracturing performance is achieved for the fracture pattern with the smallest SRV （stimulated- reservoir volume）. The largest gas production rate is obtained when the angle between fractures and wellbore becomes 90°. In the same stimulated block, fracturing performance can be enhanced for the cases with higher fracture and micro-fractures density that are connected to develop fracture network. Furthermore, the case of uneven proppant distribution has significant influence on well productivity in shale gas which is higher than that of the uniform proppant distribution at low concentration but lower than that of the uniform proppant distribution at high concentration. This paper provides important guidance for the development of multistage fracturing in the Fuling block.

关 键 词：水力压裂 页岩气 缝网形态 裂缝密度 裂缝方位 非均匀铺砂 油井产能 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]