考虑定压生产的陆相页岩气藏多层窜流产能模型  

Continental shale gas reservoir interlayer crossflow production model considering constant pressure condition

作　　者：邱凯旋 李恒[1] 张丽霞 李东海 贾红娟[5] QIU Kaixuan;LI Heng;ZHANG Lixia;LI Donghai;JIA Hongjuan(Peking University,Beijing 100871,China;Jiangmen Laboratory for Carbon and Climate Science and Technology,HongKong University of science and Technology(Guangzhou),Guangdong Jiangmen 529100,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710075,China;Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 71600,China;Exploration and Development Technology Reasearch Center of Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 716000,China)

机构地区：[1]北京大学,北京100871 [2]香港科技大学(广州)江门双碳实验室,广东江门529100 [3]陕西延长油田(集团)有限责任公司研究院,西安710075 [4]延长油田股份有限公司,陕西延安716001 [5]延长油田股份有限公司勘探开发技术研究中心,陕西延安716001

出　　处：《非常规油气》2023年第1期104-110,共7页Unconventional Oil & Gas

基　　金：国家科技重大专项“陆相页岩气产能评价与采气工艺技术”(2017ZX05039005)。

摘　　要：鄂尔多斯盆地陆相页岩气储层泥页岩层段普遍夹杂砂质薄互层。为了进一步研究砂质薄互层与页岩层之间的窜流对产能的影响,分别推导出单层和多层储层的产量解析公式,针对页岩-砂岩-页岩真实岩性组合特征形成定压条件下考虑层间窜流的解析计算流程,通过构造数值算例来验证解析计算流程的准确性,在考虑层间窜流情况下分别从孔隙度、水平方向与垂直方向渗透率比值以及薄互层厚度3个角度进行敏感性分析。结果表明:1)页岩层与砂岩层之间存在窜流,对页岩气产能有较大影响,砂岩层与页岩层的连通性越好,页岩气藏的初始产量越高;2)砂岩薄互层的厚度越大,对厚页岩层的开发效果越好,单井产量越高;3)砂岩薄互层的孔隙度以及水平方向与垂直方向渗透率比值在较小范围内变化时对单井产量的提升效果不明显。The continental shale gas reservoir in Ordos Basin is generally interbedded with thin sandstone.In order to further study the influence of crossflow between shale and thin interbedded sandstone,the analytical equations for production prediction of single and multi-layer reservoir are derived respectively and based on the shale-sandstone-shale lithologic combination in real reservoirs,the analytical calculation process of considering interlayer crossflow under constant pressure condition is formed.A numerical model is constructed to verify the accuracy of the analytical calculation process,and sensitivity analysis is carried out including porosity,the ratio of horizontal and vertical permeability and thickness.The results show that:1)The crossflow between shale and sandstone has a great influence on shale gas production,and the better the connectivity between sandstone and shale,the higher the initial production of shale gas reservoir.2)The larger the thickness of thin interbedded sandstone is,the higher the production of gas well is.3)When the porosity of thin interbedded sandstone and the ratio of horizontal to vertical permeability change in a small range,the improvement effect of single well production is not obvious.

关 键 词：陆相页岩气 层间窜流 薄互层 定压生产 产能预测 

分 类 号：TE312[石油与天然气工程—油气田开发工程]