页岩气水平井分段压裂优化设计方法——以川西页岩气藏某水平井为例  

An optimal design of multi-stage fracking for horizontal shale gas wells: A case study from the western Sichuan Basin

作　　者：郭建春[1] 梁豪[1] 赵志红[1] 王兴文[2] 林立世[2] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学 [2]中国石化集团西南油气分公司工程技术研究院

出　　处：《天然气工业》2013年第12期82-86,共5页Natural Gas Industry

基　　金：国家科技重大专项(编号:2011ZX05002-004-007HZ);四川省青年科技创新研究团队资助计划(编号:2011JTD0018);国家自然科学基金"页岩油藏网络裂缝导流模型研究"(编号:51374178)

摘　　要：页岩储层需要水力压裂才能获得理想的产能,压裂时在追求较大改造体积的同时也应注重形成与储层相匹配的缝网导流能力,以提高改造体积渗透率。基于Warren-Root模型,将压裂后形成的缝网考虑为高渗透带,利用等效渗流理论建立了等效高渗透带模型,在地质模型中利用体积及等效渗透率对压裂缝网进行表征,通过产能模拟并借助净现值理论对高渗透带长度、等效渗透率等参数进行优选,并以优选的高渗透带参数为目标,结合缝网模拟便可得到目标条件下的最优施工参数。针对川西页岩气藏某水平井使用该方法得到最优高渗透带长度为200～220m,最优等效渗透率为4～5mD。结合缝网模拟得到目标条件下的施工参数为:总液量为1 600m3,总砂量为53m3,平均砂比为10%,最高砂比为28%,施工排量为10m3/min。该设计为页岩气储层改造作业提供了技术支撑。Hydraulic fracturing treatment is a major technique stimulating the field of a gas shale reservoir. While a large stimulated volume is pursued, the fracture network conductivity should be controlled so well to match the reservoir that the permeability of the stimulated volume is improved. Based on the Warren-Root model and with the fracture network upon fracturing taken as the highpermeability zone, the equivalent high-permeability zone model was established by use of the equivalent seepage theory; secondly, the network was characterized in terms of volume and equivalent permeability in the geological model; thirdly, through performing capacity simulation while utilizing the net present value theory, such parameters were optimized as the length and equivalent permea- bility of the high-permeability zone~ and on this basis, optimal construction parameters were obtained under the objective condition combining the network simulation. In a case study from the western Sichuan Basin, the optimized high-permeability zone length ranged from 200 to 220 m, and the optimized equivalent permeability from 4 to 5 mD. Comhined with the network simulation, the construction parameters under the objective condition are： the total fluid volume of 1600 m^3 , the total sand volume of 53 m^2 , the average sand rate of 10%, the maximum sand rate of 28%, and construction displacement of 10 m^3/min. This design provides a tech- nical support for stimulating shale gas reservoirs

关 键 词：页岩 水平井 水力压裂 缝网 压裂设计 Warren Root模型 等效渗流理论 高渗透带 四川盆地 

分 类 号：TE37[石油与天然气工程—油气田开发工程]