油藏各向异性对鱼骨井结构影响的数值模拟研究  

Numerical Study of the Effect of Reservoir Anisotropy on Fishbone Well Structure

作　　者：范乐宾[1,2] 刘月田[1,2] 顾少华[1,2] 顾文欢[1,2] 廖恒杰[1,2] 敖坤[1,2] 

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

出　　处：《石油钻探技术》2011年第5期68-73,共6页Petroleum Drilling Techniques

基　　金：国家科技重大专项之课题"复杂油气田地质与提高采收率技术"(编号:2009ZX05009)部分研究内容

摘　　要：鱼骨井由于能增加泄油面积而提高油井产能,因此在油气田开发中得到了越来越广泛的应用。由于油藏各向异性对鱼骨井结构的影响规律非常复杂,常规求解鱼骨井产能的解析方法中很少考虑油藏各向异性的影响。为此,采用将各向异性地层中鱼骨井等价到各向同性地层中的方法,建立了鱼骨井在平面各向异性地层中的结构变化模型。并据此讨论了两种特殊情况下,各向异性强度对鱼骨井结构的影响规律:鱼骨井主井筒与最大渗透率方向平行时,主井筒长度最小,分支角之和最大;鱼骨井主井筒与最大渗透率方向垂直时,主井筒长度最大,分支角之和最小;各向异性强度越大,对于鱼骨井长度越有利,但对鱼骨井分支角之和的不利空间区域越大;分支角越小,各向异性对鱼骨井长度的影响越大。Fishbone wells have been widely used in oil and gas development because they can increase the drainage area and improve well productivity.The analytical method to calculate the productivity of fishbone well seldom considers the effect of reservoir anisotropy due to its complexity.Using the method of fishbone well in anisotropic formation which is equivalent to that in anisotropic formation,a fishbone well structural model has been established for the isotropic formations.Two special cases the wellbore direction parallel and perpendicular to the direction of maximum permeability were discussed.The effect of anisotropy on fishbone well was analyzed.The results show that when fishbone well is parallel to the direction of maximum permeability,the wellbore length is the smallest and the summation of branch angles is the largest;when it is perpendicular to the direction of maximum permeability,the wellbore length is the largest and the summation of branch angles is the smallest.The length of fishbone well is longer with greater anisotropy,while the unfavorable region to branch angle will be larger.The effect of anisotropy on wellbore length is higher with smaller branch angle.

关 键 词：鱼骨井 非均质油藏 各向异性 渗透率 数学模型 

分 类 号：TE312[石油与天然气工程—油气田开发工程]