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    井周压裂裂缝Gd示踪的热中子探测方法研究

    张锋 陈前 刘军涛 张泉滢 李向辉 遆永周

    张锋, 陈前, 刘军涛, 张泉滢, 李向辉, 遆永周, 2018. 井周压裂裂缝Gd示踪的热中子探测方法研究. 地球科学, 43(10): 3799-3808. doi: 10.3799/dqkx.2017.521
    引用本文: 张锋, 陈前, 刘军涛, 张泉滢, 李向辉, 遆永周, 2018. 井周压裂裂缝Gd示踪的热中子探测方法研究. 地球科学, 43(10): 3799-3808. doi: 10.3799/dqkx.2017.521
    Zhang Feng, Chen Qian, Liu Juntao, Zhang Quanying, Li Xianghui, Di Yongzhou, 2018. Study of a Method to Evaluate Hydraulic Fracturing near Wellbore Using Thermal Neutron Detection Based on Gd Tracer. Earth Science, 43(10): 3799-3808. doi: 10.3799/dqkx.2017.521
    Citation: Zhang Feng, Chen Qian, Liu Juntao, Zhang Quanying, Li Xianghui, Di Yongzhou, 2018. Study of a Method to Evaluate Hydraulic Fracturing near Wellbore Using Thermal Neutron Detection Based on Gd Tracer. Earth Science, 43(10): 3799-3808. doi: 10.3799/dqkx.2017.521

    井周压裂裂缝Gd示踪的热中子探测方法研究

    doi: 10.3799/dqkx.2017.521
    基金项目: 

    国家重大油气专项 2011ZX0520-002

    国家自然科学基金项目 41574119

    中央高校基本科研业务费专项 15CX06008A

    国家自然科学基金项目 41374125

    详细信息
      作者简介:

      张锋(1970-), 男, 教授, 博士, 从事核测井方法、核测井数据处理及蒙特卡罗模拟研究

    • 中图分类号: P631.8

    Study of a Method to Evaluate Hydraulic Fracturing near Wellbore Using Thermal Neutron Detection Based on Gd Tracer

    • 摘要: 水力压裂是提高非常规油气开采的重要手段,支撑剂位置及裂缝参数是评价压裂效果的重要因素.提出了以Gd作为示踪剂探测热中子来评价井周裂缝方法,将热中子双组扩散理论与数值模拟方法相结合,定义热中子变化参数WTN来指示裂缝宽度,并分析了岩性、井眼尺寸、地层孔隙度、地层水矿化度及含油饱和度对WTN的影响.模拟结果表明:随着裂缝宽度的增加,WTN先呈指数增加后趋于平缓;而地层孔隙度越大、地层水矿化度越小,WTN越大;井眼尺寸和地层含油饱和度的变化对WTN影响较小.利用蒙特卡罗方法建立了地层孔隙度、矿化度石灰岩地层压裂前后的数值计算模型,模拟研究了不同深度地层的热中子分布,得到了近远探测器热中子计数FAR、NEAR和WTN的响应曲线,最终处理裂缝参数结果与设定模型相吻合,验证了利用Gd示踪热中子探测方法可以来评价井周裂缝.

       

    • 图  1  计算模型

      Fig.  1.  Schematic diagram of Monte Carlo simulation model

      图  2  热中子径向分布

      a.未压裂地层;b.裂缝宽度为0.8 cm地层

      Fig.  2.  Thermal neutron radial distribution

      图  3  不同裂缝宽度条件下探测器热中子及WTN的响应关系

      Fig.  3.  Response curves of thermal neutron and WTN under different fracture width

      图  4  不同孔隙度条件下热中子计数率及WTN对裂缝宽度的响应

      Fig.  4.  The response curves of the thermal neutron count rate and the WTN to fracture width under different porosity

      图  5  不同孔隙度的WTN校正后与裂缝宽度的关系

      Fig.  5.  The relationship between the corrected WTN of different porosity and the fracture width

      图  6  不同矿化度条件下热中子及WTN对裂缝宽度的响应

      Fig.  6.  The response of thermal neutron and WTN to fracture width under different salinity

      图  7  不同裂缝宽度条件下WTN对地层水矿化度的响应关系

      Fig.  7.  The WTN of salinity correction chart

      图  8  不同井眼尺寸条件下热中子计数率及WTN对裂缝宽度的响应曲线

      Fig.  8.  The response curves of thermal neutron count rate and WTN to fracture width under different borehole size

      图  9  不同地层岩性条件下热中子计数率及WTN对裂缝宽度的响应曲线

      Fig.  9.  The response curves of thermal neutron count rate and WTN to fracture width under different Lithology

      图  10  不同裂缝宽度条件下热中子计数率及WTN对含油饱和度的响应曲线

      Fig.  10.  The response curves of thermal neutron count rate and WTN to oil saturation under different fracture width

      图  11  实例模拟曲线

      Fig.  11.  The simulation of measured curve

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    • 收稿日期:  2017-04-23
    • 刊出日期:  2018-10-20

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