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基于采灌均衡模拟的砂岩热储合理采灌井距计算方法

段晓飞 康凤新 吴晓华 王明珠 杨亚宾 战静华 陈京鹏

段晓飞, 康凤新, 吴晓华, 王明珠, 杨亚宾, 战静华, 陈京鹏. 基于采灌均衡模拟的砂岩热储合理采灌井距计算方法[J]. 地质科技通报, 2024, 43(5): 170-180. doi: 10.19509/j.cnki.dzkq.tb20230268
引用本文: 段晓飞, 康凤新, 吴晓华, 王明珠, 杨亚宾, 战静华, 陈京鹏. 基于采灌均衡模拟的砂岩热储合理采灌井距计算方法[J]. 地质科技通报, 2024, 43(5): 170-180. doi: 10.19509/j.cnki.dzkq.tb20230268
DUAN Xiaofei, KANG Fengxin, WU Xiaohua, WANG Mingzhu, YANG Yabin, ZHAN Jinghua, CHEN Jingpeng. A methodology for determining the optimal well spacing in sandstone geothermal reservoirs through production-reinjection equilibrium simulation[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 170-180. doi: 10.19509/j.cnki.dzkq.tb20230268
Citation: DUAN Xiaofei, KANG Fengxin, WU Xiaohua, WANG Mingzhu, YANG Yabin, ZHAN Jinghua, CHEN Jingpeng. A methodology for determining the optimal well spacing in sandstone geothermal reservoirs through production-reinjection equilibrium simulation[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 170-180. doi: 10.19509/j.cnki.dzkq.tb20230268

基于采灌均衡模拟的砂岩热储合理采灌井距计算方法

doi: 10.19509/j.cnki.dzkq.tb20230268
基金项目: 

国家自然科学基金项目 42072331

国家自然科学基金项目 U1906209

泰山学者工程专项经费 tstp20230626

山东省部省合作地质勘查项目 鲁勘字[2020]44[2021]49号

山东省地质矿产勘查开发局2022年科技引领项目 鲁地字[2022]15号

详细信息
    作者简介:

    段晓飞, E-mail: changtingsongbie@163.com

    通讯作者:

    康凤新, E-mail: kangfengxin@126.com

  • 中图分类号: P314

A methodology for determining the optimal well spacing in sandstone geothermal reservoirs through production-reinjection equilibrium simulation

More Information
  • 摘要:

    为实现地热能可持续开发利用的目标, 需要明确不同采灌条件下合理的采灌井间距。为此, 以鲁北馆陶组热储为研究对象, 建立了层状热储开发的概念模型及数学模型, 采用COMSOL Multiphysics多场耦合模拟软件建立了地热对井采灌井距计算器。通过参数拟合及模拟结果对比, 验证了模型的准确性; 进而以软件APP编译功能为基础, 以普通用户使用为导向, 简化相关参数输入, 建立了地热采灌井距计算APP。为适应实际生产需求, 计算了不同采灌量条件下对应的合理采灌井距。计算结果表明: 鲁北地区馆陶组热储采灌量分别为40, 60, 80, 100 m3/h时, 不发生热突破的合理采灌井距分别为290, 330, 360, 390 m。研究表明: (1)在鲁北层状传导型砂岩热储地区, 对概念模型进行简化处理后, 数值模拟计算结果可靠, 可以在该地区建立合理采灌井距计算APP; (2)水热数值模拟是合理采灌井距计算的有力手段, 能够确定开采量、回灌量、回灌温度、采灌井距等地热开发利用工程的关键参数, 有利于实现地热资源可持续开发利用。

     

  • 图 1  鲁北地质构造图(据文献[15]修改)

    a.鲁西北平原; b.济阳坳陷; c.临清坳陷; d.沧县隆起; e.内黄凸起; f.埕宁凸起; g.黄骅坳陷; h.冀中坳陷; i.渤中坳陷; j.辽河坳陷

    Figure 1.  Geological structure map of northern Shandong

    图 2  地热资源形成概念模型图(地层代号见正文)

    Figure 2.  Conceptual model diagram of geothermal resource formation

    图 3  概念模型示意图

    Qout为开采量,m3/h;Qin为回灌量,m3/h;Tout为井口温度,℃;Tin为回灌温度,℃;Ttop为当地恒温带温度,℃;ΔT为温度梯度,℃/m;φ为有效孔隙度; Keff为热储层导热率, W/mK; 下同

    Figure 3.  Conceptual model diagram

    图 4  模型的初始及边界条件

    qc为大地热流密度, mW/m2

    Figure 4.  Initial and boundary conditions of the model

    图 5  矩形周期函数

    Figure 5.  Rectangular periodic function

    图 6  温度测井及参数拟合图

    Figure 6.  Temperature logging and parameter fitting diagram

    图 7  对井采灌第100 a热储层温度分布(a)及历年井口温度动态变化图(b)(采灌井距180 m,采灌量60 m3/h)

    Figure 7.  Temperature distribution of thermal reservoir(a) and the dynamic variation of wellhead water temperature in the 100th year(b) (production-reinjection well spacing 180 m, production and reinjection volume of 60 m3/h)

    图 8  合理采灌井距APP界面示意图

    Figure 8.  Interface diagram of the appropriate production and reinjection well spacing APP

    图 9  不同采灌量条件下开采温度计算

    Figure 9.  Mining temperature calculation under different reinjection quantities and reinjection temperatures

    图 10  不同采灌量条件下第100 a热储层温度分布

    Figure 10.  Temperature distribution of thermal reservoir in the 100th year under the different reinjection quantities

    表  1  德州市水文家园回灌井地层层序

    Table  1.   Stratigraphic sequence of reinjection well at the hydrological site in Dezhou

    地层 深度/m 厚度/m 岩性
    第四系(Q) 0 260 黏土、粉砂岩、中细砂岩
    新近系 明化镇组(N2m) 260 890 泥岩、中细砂岩
    馆陶组(N1g) 上段 1 150 169 泥岩与细砂岩互层
    下段 1 319 217 砂砾岩
    古近系 东营组(E3d) 1 536(未揭穿) 8.5 泥岩
    下载: 导出CSV

    表  2  模型参数取值列表

    Table  2.   List of model parameter values

    参数 取值 描述 参数 取值 描述
    din/mm 177.8 回灌井井径 Qin/(m3·h-1) 60 回灌量
    dpro/mm 177.8 开采井井径 Qout/(m3·h-1) 60 开采量
    L/m 180 采灌井间距 Hm/m -80 水位标高
    qc/(W·m-2) 0.062 9 大地热流密度 cp/(J·kg-1·K-1) 909 热储层比热容
    htop/m 1 319 储层顶板埋深 kc/(W·m-1·K-1) 2.1 储层热导率
    H/m 217 热储层厚度 ρden/(kg·m-3) 2 000 热储层密度
    Kk/10-3 μm2 1 000 储层渗透率 Th/℃ 35 回灌尾水温度
    kr 0.22 孔隙率 Tout/℃ 54.4 井口温度
    t/a 100 计算时长 t1/Ms 1 输出时间间隔
    下载: 导出CSV

    表  3  德州市水文家园模拟结果对比表

    Table  3.   Simulation results comparison table at the hydrological site in Dezhou

    模型 开采量Qout/(m3·h-1) 回灌量Qin/(m3·h-1) 回灌温度Tin/℃ 井距/m 第100 a井口温度Tout/℃
    XU等[12] 60 60 35 180 46.6
    本文模型 60 60 35 180 47.3
    XU等[12] 40 40 35 180 48.2
    本文模型 40 40 35 180 48.6
    下载: 导出CSV
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  • 收稿日期:  2023-05-22
  • 录用日期:  2023-11-17
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