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页岩气体积压裂水平井试井解释新模型
徐中一,方思冬,张彬,刘银山,刘华,戴城
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(1.中国石化石油勘探开发研究院,北京100083;2.中国石油长庆油田分公司对外合作部,陕西西安710018;3.陕西延长石油(集团)有限责任公司研究院,陕西西安710065)
摘要:
体积压裂已经成为非常规油气藏有效开发的关键,建立能够表征复杂裂缝网络的试井解释模型非常重要。考虑体积压裂形成的复杂裂缝网络,基于正交缝网假设,建立了体积压裂水平井试井解释新模型。运用Laplace变换获得了模型的解析解,利用数值模拟在验证解析解准确性的基础上,分析了缝网参数对试井典型曲线特征的影响规律。结果表明:所建立的解析模型能够准确表征复杂裂缝网络,其计算结果准确,适用于体积压裂水平井试井解释;体积压裂水平井一般出现5个主要的流动阶段,分别是井筒储集、人工裂缝线性流、次生裂缝-人工裂缝窜流、基质线性流和边界控制流阶段;缝网参数对试井典型曲线特征的影响较大,而且不同缝网参数影响不同流动阶段。
关键词:  裂缝网络  页岩气  试井解释  体积压裂  水平井  流动阶段
DOI:10.13673/j.cnki.cn37-1359/te.2020.03.016
基金项目:国家科技重大专项“水常压页岩气开发技术政策研究”(2016ZX05061003),国家自然科学基金项目“页岩气藏压裂有效缝网反演方法研究”(51804334),中国石化“十条龙”科技攻关项目“超深高含硫气田提高采收率技术”(P18062)。
A new well test model for horizontal wells by stimulated reservoir volume in shale gas reservoirs
XU Zhongyi,FANG Sidong,ZHANG Bin,LIU Yinshan,LIU Hua,DAI Cheng
(1.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing City,100083,China;2.PetroChina Changing Oilfield Company Foreign Cooperation Department,Xi’an City,Shaanxi Province,710018,China;3.Research Institute of Yanchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710065,China)
Abstract:
The stimulated reservoir volume has become a critical technology for the development of the unconventional oil and gas reservoirs. It is very important to propose well test models characterizing the complex fracture networks. Based on the assumption of orthogonal fracture networks,a new well test model is proposed for the horizontal wells by the stimulated reservoir volume considering the complex fracture networks. Laplace transformation is used to obtain the analytical solution of the model,and the solution is validated with the numerical simulation. The effect of fracture networks parameters on type curves is analyzed. The results show that the analytical model can successfully characterize the complex fracture networks,and the computation is precise,so the model is suitable for the well test analysis for the horizontal wells by the stimulated reservoir volume. There are five flow regimes for the horizontal wells by the stimulated reservoir volume:wellbore storage,linear flow in the artificial fractures,crossflow between the secondary fractures and artificial fractures,linear flow in the matrix and boundary-controlled flow respectively. The parameters of the fracture network have a great impact on characteristics of the type curves,and the different parameters have influence on the different flow regimes.
Key words:  fracture networks  shale gas  well test interpretation  stimulated reservoir volume  horizontal well  flow regime

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