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    页岩气藏体积压裂有效改造体积计算方法

    苏玉亮 盛广龙 王文东 贾建鹏 吴春新

    苏玉亮, 盛广龙, 王文东, 贾建鹏, 吴春新, 2017. 页岩气藏体积压裂有效改造体积计算方法. 地球科学, 42(8): 1314-1323. doi: 10.3799/dqkx.2017.532
    引用本文: 苏玉亮, 盛广龙, 王文东, 贾建鹏, 吴春新, 2017. 页岩气藏体积压裂有效改造体积计算方法. 地球科学, 42(8): 1314-1323. doi: 10.3799/dqkx.2017.532
    Su Yuliang, Sheng Guanglong, Wang Wendong, Jia Jianpeng, Wu Chunxin, 2017. A New Approach to Calculate Effective Stimulated Reservoir Volume in Shale Gas Reservoir. Earth Science, 42(8): 1314-1323. doi: 10.3799/dqkx.2017.532
    Citation: Su Yuliang, Sheng Guanglong, Wang Wendong, Jia Jianpeng, Wu Chunxin, 2017. A New Approach to Calculate Effective Stimulated Reservoir Volume in Shale Gas Reservoir. Earth Science, 42(8): 1314-1323. doi: 10.3799/dqkx.2017.532

    页岩气藏体积压裂有效改造体积计算方法

    doi: 10.3799/dqkx.2017.532
    基金项目: 

    国家科技重大专项 2017ZX05049-006

    国家自然科学基金项目 51674279

    中央高校基本科研业务费专项资金项目 17CX06010

    中国石油大学研究生创新工程资助项目 YCXJ2016016

    中国博士后科学基金资助项目 2016M602227

    详细信息
      作者简介:

      苏玉亮(1970-), 男, 教授, 主要从事低渗透油藏渗流理论与开采技术、非常规油气渗流与开发等方面的研究

      通讯作者:

      王文东

    • 中图分类号: P641.2

    A New Approach to Calculate Effective Stimulated Reservoir Volume in Shale Gas Reservoir

    • 摘要: 页岩气藏矿场压裂实践表明,储层有效改造体积(effective stimulated reservoir volume,简称ESRV)是影响页岩气藏体积压裂水平井生产效果的关键因素,ESRV的准确计算对页岩气藏压裂方案评价与体积压裂水平井产量预测具有重要作用.基于页岩储层改造体积(stimulated reservoir volume,简称SRV)多尺度介质气体运移机制,建立了SRV区域正交离散裂缝耦合双重介质基质团块来表征单元体渗流模型(representation elementary volume,简称REV),并结合北美页岩储层实例研究了次生裂缝间距、宽度等缝网参数对页岩气藏气体运移规律的影响.在此基础上根据SRV区域次生裂缝分布特征,采用分形质量维数定量表征裂缝间距分布规律,结合页岩气藏次生裂缝间距对基质团块内流体动用程度的影响规律,得到了页岩气藏体积压裂ESRV计算方法.结果表明SRV区域次生裂缝间距对基质团块内吸附及自由气影响较大,次生裂缝间距小于0.20 m时可以实现SRV区域基质团块内流体向各方向裂缝的"最短距离"渗流.选取北美典型页岩储层生产井体积压裂数据进行ESRV计算,页岩气藏目标井ESRV占体积压裂SRV的37.78%.因此ESRV受改造区域次裂缝分布规律及SRV有效裂缝间距界限的影响,是储层固有性质及人工压裂因素综合作用的结果.

       

    • 图  1  页岩储层SRV区域表征单元体渗流模型

      图d据Javadpour(2009)

      Fig.  1.  Representative elementary volume flow model of SRV region in shale reservoirs

      图  2  不同裂缝间距下吸附气及总气体产出比例曲线

      Fig.  2.  Production curves of absorbed gas and total gas with different fracture spaces

      图  3  裂缝宽度对SRV有效裂缝间距界限影响

      Fig.  3.  Effect of fracture width on effective fracture space of SRV

      图  4  地层压力对SRV有效裂缝间距界限影响

      Fig.  4.  Effect of reservoir pressure on effective fracture space of SRV

      图  5  压力梯度对SRV有效裂缝间距界限影响

      Fig.  5.  Effect of pressure gradient on effective fracture space of SRV

      图  6  体积压裂SRV次生裂缝分布

      a.三维图;b.俯视图

      Fig.  6.  Secondary fracture distribution of SRV

      图  7  体积压裂SRV区域次生裂缝间距分布规律

      Fig.  7.  Secondary fracture space distribution in SRV region

      表  1  Barnett页岩气藏储层参数

      Table  1.   Reservoir parameters of Barnett shale gas reservoir

      参数 数值
      次生裂缝宽度(m) 0.001
      气体压缩系数(MPa-1) 0.05
      干酪根孔径(nm) 50
      无机基岩孔隙度 0.1
      REV水平方向裂缝条数 5
      REV垂直方向裂缝条数 5
      气体粘度(mPa·s) 0.018 4
      气体摩尔质量(kg·mol-1) 0.016
      储层温度(K) 338
      单位岩心体积中干酪根固体体积 0.5
      无机基岩孔隙迂曲度 5
      干酪根表面朗格缪尔最大吸附浓度(m3·kg-1) 3.1×10-3
      REV入口压力(MPa) 15
      REV压力梯度(MPa·m-1) 0.05
      干酪根孔隙度 0.2
      无机基岩孔径(nm) 100
      次生裂缝孔隙度 0.02
      次生裂缝间距(m) 0.05
      干酪根表面扩散系数(10-4 m2·s-1) 5
      朗格缪尔压力(MPa) 13.78
      干酪根固体形状因子(m-2) 0.5
      角动量调节系数 0.8
      干酪根孔隙迂曲度 5
      REV初始压力(MPa) 50
      下载: 导出CSV
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