基于PEBI网格加密的水平井分段压裂模拟  

Simulation of staged fracturing for horizontal wells based on PEBI grid refinements

作　　者：吴军来[1,2] 刘月田[1,2] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京昌平102249 [2]中国石油大学(北京)石油工程学院,北京昌平102249

出　　处：《大庆石油学院学报》2010年第6期53-57,63,共6页Journal of Daqing Petroleum Institute

基　　金：国家科技重大专项(2009ZX05009-004-03)

摘　　要：针对有些模拟水力压裂井方法过于简单,不能表征压裂井的流动特性问题,通过分析模拟水力压裂井的表皮因子法、直角网格加密法和PEBI网格加密法,提出利用PEBI网格加密技术建立直井—水平井压裂模型,同时结合试井解释理论,推导出水平井压裂多裂缝时会出现双径向流,验证直井压裂时存在明显的线性流和双线性流动特性.结果表明:水平井压裂成单缝时,中部压力下降比端部快,容易水淹;水平井压裂形成多缝时,随着压裂缝数量的增加,缝间距离减小,裂缝间的相互影响作用明显;早期压力下降快,由径向流转为双径向流的时间变早,试井曲线上出现早期曲线向下移动.Many methods of fractured well representation in simulation model are known,some of them are too simple to be used in simulation model because they do not represent a fractured well behavior.By comparing three methods of hydraulic fracture representation,we put forward the establishment PEBI grid refinement technology to build vertical-horizontal fractured model.Combined with test interpretation theory,we arrived at the conclusion that horizontal wells with multi-fracture can result in bi-radial flow,and verified that the vertical well fracturing presents obvious linear flow and bilinear flow characteristics.The results show that when horizontal well fracturing produces single crack,the middle part pressure drops faster than the ends,and easily flooded;when horizontal well fracturing produces more cracks,with the number of fracture increase,the distance between fractures becomes smaller,the interaction between the cracks obvious,pressure drops quickly in the early,the time change early from radial flow to the bi-radial flow,so well testing curve moves down earlier.

关 键 词：分段压裂 水平井 PEBI网格 双径向流 数值模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]