致密气藏压裂水平井产能分析及压裂优化设计  

Productivity Analysis and Fracturing Design Optimization of Fractured Horizontal Well in Tight Gas Reservoirs

作　　者：孙元伟[1] 程远方 时凤霞[1] 王艳丽[1] 印树明[1] SUN Yuanwei;CHENG Yuanfang;SHI Fengxia;WANG Yanli;YIN Shuming(School of Petroleum Engineering,Shengli College,China University of Petroleum,Dongying,Shandong 257061,China;School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学胜利学院油气工程学院,山东东营257061 [2]中国石油大学石油工程学院,山东青岛266580

出　　处：《新疆石油地质》2018年第6期727-731,共5页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(51574270);教育部长江学者和创新团队发展计划(RT1086)

摘　　要：致密气藏储集层渗透率低,孔喉细小,储集层流动条件极差。基于应力敏感性对致密储集层渗透率的影响,建立了致密气藏水平井压裂渗流模型,得到考虑井筒储集效应的无因次压力拉普拉斯空间半解析解。在验证模型正确性的基础上,绘制水平井分段压裂产能变化曲线,对产能影响因素进行分析并设计正交试验,以确定主控因素。研究结果表明:压裂参数中裂缝间改造区域渗透率对产能影响最大,裂缝长度次之,裂缝条数最小。基于该模型对胜利油田某致密气藏储集层压裂进行了优化设计,实例计算结果表明,研究区块在裂缝半长为140 m,裂缝密度为6条/km时,尽量增大裂缝间改造区域渗透率可以获得最佳产量。研究结果对致密气藏水平井压裂设计具有一定的指导意义。Tight gas reservoirs are characterized by low permeability, narrow pore throats and extremely poor flowing conditions. Based on the influence of stress sensitivity on reservoir permeability, this paper establishes a new mathematical flow model for horizontal well fractur.ing in tight gas reservoirs and then obtains semi.analytical solutions of dimensionless pressure considering wellbore storage effect through Laplace transform. Based on the verification of the validity of the model, the productivity vs. time curves are plotted for staged fracturing in horizontal wells, the factors influencing productivity are analyzed and orthogonal experiment is designed to determine the main controlling factors. The results show that when the fracture half.length is 140 m and the density of fractures is 6 per 1000 m, the optimum production can be obtained by increasing the permeability of the stimulated area. The conclusion is of guiding significance for the design of horizontal well fracturing in tight gas reservoirs.

关 键 词：致密气藏 水平井 应力敏感性 正交试验 产能分析 压裂优化设计 

分 类 号：TE122.14[石油与天然气工程—油气勘探]