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基于单井注抽试验的增强型地热系统储层近井渗透率原位测试方法研究

徐含英 姜振蛟 许天福 陈炫沂

徐含英,姜振蛟,许天福,等. 基于单井注抽试验的增强型地热系统储层近井渗透率原位测试方法研究[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202209010
引用本文: 徐含英,姜振蛟,许天福,等. 基于单井注抽试验的增强型地热系统储层近井渗透率原位测试方法研究[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202209010
XU Hanying, JIANG Zhenjiao, XU Tianfu, et al. Single well injection withdraw (SWIW) - based tracer test approach for in-situ permeability estimation in an enhanced geothermal system[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202209010
Citation: XU Hanying, JIANG Zhenjiao, XU Tianfu, et al. Single well injection withdraw (SWIW) - based tracer test approach for in-situ permeability estimation in an enhanced geothermal system[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202209010

基于单井注抽试验的增强型地热系统储层近井渗透率原位测试方法研究

doi: 10.16030/j.cnki.issn.1000-3665.202209010
基金项目: 国家重点研发计划项目(2018YFB1501803)
详细信息
    作者简介:

    徐含英(1998-),男,硕士研究生,主要从事热储层参数示踪反演方法的研究工作。E-mail:1215273766@qq.com

    通讯作者:

    姜振蛟(1986-),男,博士,教授,主要从事储层表征与多场耦合模拟技术的研究工作,E-mail:zjjiang@jlu.edu.cn

  • 中图分类号: P314

Single well injection withdraw (SWIW) - based tracer test approach for in-situ permeability estimation in an enhanced geothermal system

  • 摘要: 储层压裂阶段,对近井渗透率的高效评估是分析压裂效果、更新压裂方案的重要环节。但受技术或成本制约,目前仍然缺少深部储层近井渗透率原位测算方法。借助于压裂施工过程的间歇性注入和返排泄压环节,提出一种依托压裂施工过程的单井注抽示踪试验工艺,以及基于数值求解和解析解的两种渗透率估算方法,实现了低成本条件下深部储层渗透率原位测试。将该套方法体系应用于实际增强型地热系统场地,结果显示:在单井注抽试验示踪剂突破曲线不完备条件下,通过数值方法仍然能够合理地估算近井渗透率(0.8 D),但方法计算效率较低;而在示踪剂突破曲线相对完备条件下(即监测得到示踪剂浓度峰值),可采用解析法快速估算渗透率(0.25 D);但由于解析法中未能精确考虑井筒内部长距离示踪剂迁移过程和储层内部弥散作用对示踪剂突破曲线的影响,计算精度相对较低。然而,通过数值方法和解析方法估算近井渗透率处于同一数量级,表明解析法仍可以作为渗透率原位快速估算的一种有效手段。文章提出的单井注抽试验工艺和数据解释方法体系为深部储层渗透率原位测试提供了一种新的途径。
  • 图  1  依托于压裂施工过程的单井注抽试验流程示意图

    Figure  1.  Single well injection and withdraw test related to the processes of hydraulic fracturing

    图  2  共和盆地地形图

    Figure  2.  Topographic map of the Gonghe Basin

    图  3  共和GR1井测温曲线

    Figure  3.  Downhole temperature logs in well Gonghe GR1

    图  4  示踪剂注入浓度和反排浓度随时间变化曲线

    Figure  4.  Variation of tracer concentrations in the injection fluid and extracted fluid

    图  5  井筒与储层水-热-示踪剂耦合传输过程概念模型

    Figure  5.  Conceptual model of hydrothermal and tracer transport in the wellbore and reservoir

    图  6  示踪剂注入期和返排期储层内部示踪剂迁移过程示意图

    Figure  6.  Spatial distribution of tracer concentration in the reservoir during injection and backflow period.

    图  7  不同储层渗透率控制下示踪剂突破曲线形态

    Figure  7.  Tracer breakout curve morphology under different reservoir permeability controls (Scatter points are measured data)

    表  1  井储条件和示踪试验施工参数汇总表

    Table  1.   Well-reservoir conditions and parameters controlling the tracer test

    类型参数数值类型参数数值
    井结构进水段长度/m500示踪
    试验
    示踪剂用量/kg200
    进水段顶部埋深/m3200注入排量/( m3·h-1102
    进水段井径/m0.1~0.2注入浓度图4
    储层
    条件
    温度/°C200注入时长/h10.5
    导热系数/(W·m−1∙K−12.51返排时长/h6
    比热容/(J·kg−1∙°C−1920返排流量/(m3·h−151.5
    岩性花岗岩返排时井口压力/MPa40
    下载: 导出CSV
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  • 收稿日期:  2022-09-05
  • 修回日期:  2022-10-15
  • 网络出版日期:  2023-04-04

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