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大宁−吉县区块深层煤层气生产特征与开发技术对策

聂志宏 时小松 孙伟 闫霞 黄红星 刘莹 冯延青

聂志宏,时小松,孙伟,等. 大宁−吉县区块深层煤层气生产特征与开发技术对策[J]. 煤田地质与勘探,2022,50(3):193−200 doi: 10.12363/issn.1001-1986.21.12.0818
引用本文: 聂志宏,时小松,孙伟,等. 大宁−吉县区块深层煤层气生产特征与开发技术对策[J]. 煤田地质与勘探,2022,50(3):193−200 doi: 10.12363/issn.1001-1986.21.12.0818
NIE Zhihong,SHI Xiaosong,SUN Wei,et al. Production characteristics of deep coalbed methane gas reservoirs in Daning-Jixian Block and its development technology countermeasures[J]. Coal Geology & Exploration,2022,50(3):193−200 doi: 10.12363/issn.1001-1986.21.12.0818
Citation: NIE Zhihong,SHI Xiaosong,SUN Wei,et al. Production characteristics of deep coalbed methane gas reservoirs in Daning-Jixian Block and its development technology countermeasures[J]. Coal Geology & Exploration,2022,50(3):193−200 doi: 10.12363/issn.1001-1986.21.12.0818

大宁−吉县区块深层煤层气生产特征与开发技术对策

doi: 10.12363/issn.1001-1986.21.12.0818
基金项目: 中石油前瞻性基础性技术攻关项目(2021DJ2301);中石油基础性研究项目(2019E-2501)
详细信息
    第一作者:

    聂志宏,1983年生,男,山西朔州人,硕士,高级工程师,从事煤层气开发地质研究. E-mail:nzh@petrochina.com.cn

    通信作者:

    时小松,1988年生,男,四川广安人,硕士,工程师,从事煤层气开发地质研究. E-mail:sxs@petrochina.com.cn

  • 中图分类号: P618.11

Production characteristics of deep coalbed methane gas reservoirs in Daning-Jixian Block and its development technology countermeasures

  • 摘要: 鄂尔多斯盆地埋深超过2 000 m的深层煤层气资源丰富,是煤层气勘探开发重要领域,鄂尔多斯盆地东缘大宁−吉县区块开展了一批深层煤层气工艺试验,初步取得一定效果,但规模效益开发主体技术亟待攻关。基于实验分析、生产数据和裂缝监测等资料,通过对大宁−吉县区块深层煤层气储层特征、生产动态和压裂改造效果开展评价,分析了深层煤层气生产特征并提出开发技术对策。研究认为:(1) 深层煤储层具有“低渗、高含气、高含气饱和度、富含游离气”的特征;(2) 深层煤层气产能主要受资源富集、微构造和有效改造规模控制,在正向微构造发育区,资源越富集、加液强度越大、加砂强度越大,越有利于扩大供气能力和提高单井产量;(3) 深层煤层气生产井呈现出以游离气产出为主的高产期、游离气和吸附气共同产出的稳产及递减期和以吸附气产出为主的低产期三段式产出特征。基于上述认识,提出了深层煤层气开发技术对策,实施的D6-7P1井取得较好生产效果,证实在有利区实施超大规模加砂压裂可有效提高深层煤层气产能。

     

  • 图  大宁−吉县区块构造带分布

    Fig. 1  Distribution map of the structural belt of Daning-Jixian Block

    图  8号煤层等温吸附曲线

    Fig. 2  Isothermal adsorption curve of the No.8 coal seam

    图  大宁−吉县区块深层煤层气平均生产曲线

    Fig. 3  Average production curve of deep coalbed methane in Daning-Jixian Block

    图  深层煤层气稳产期累产气量与煤层厚度、含气量及资源丰度的关系

    Fig. 4  Relationship between cumulative gas production and coal seam thickness, gas content and resource abundance during stable production period of deep coalbed methane

    图  深层煤层气日产气量与资源丰度的关系

    Fig. 5  Relationship between daily gas production and resource abundance of deep coalbed methane

    图  加液强度与日产气量散点图

    Fig. 6  Scatter plot of liquid addition intensity and daily gas production

    图  加砂强度与日产气量散点图

    Fig. 7  Scatter plot of sand strength and daily gas

    图  D3-7X2井返排及生产曲线

    Fig. 8  D3-7X2 well flowback and production curves

    图  D6-7P1井返排及生产曲线

    Fig. 9  D6-7P1 well flowback and production curves

    图  10  深层煤层气井预测典型生产曲线

    Fig. 10  Prediction of typical production curves for deep coalbed methane wells

    表  1  大宁−吉县地区深层8号煤等温吸附测试数据

    Table  1  Isothermal adsorption test data of the No. 8 deep coal seam in Daning-Jixian Block

    样品号储层
    压力/
    MPa
    Langmuir
    体积/
    (m3·t−1)
    Langmuir
    压力/
    MPa
    实测含气量/
    (m3·t−1)
    理论含气量/
    (m3·t−1)
    含气
    饱和度/%
    取心
    方式
    P22-Y1 19.82 28.53 2.86 24.68 24.93 99.01 常规钻杆取心
    P22-Y2 19.85 24.94 3.70 20.61 21.02 98.04
    D3-4-Y1 20.39 27.09 2.91 23.45 23.72 98.88
    D3-4-Y2 20.42 27.77 3.15 23.81 24.06 98.97
    D3-4-Y3 20.44 27.93 2.70 24.38 24.67 98.82
    P19-Y1 19.64 25.72 2.55 19.82 22.76 87.07
    H12-Y1 19.87 35.47 4.02 29.59 29.50 100.00
    P20-Y1 19.76
    平均 20.06 28.21 3.13 23.26 24.38 97.26
    P20-Y2 20.47 31.47 3.21 29.89 27.20 109.89 保压取心
    P20-Y3 20.47 28.65 3.25 22.87 24.73 92.48
    P20-Y4 20.48 32.83 3.46 23.72 28.09 84.44
    P20-Y5 20.49 29.39 3.22 25.11 25.40 98.86
    平均 20.48 30.59 3.29 25.40 26.36 96.42
    下载: 导出CSV

    表  2  大宁−吉县地区深层8号煤总含气数据

    Table  2  Total gas content data of the No. 8 deep coal seam in Daning Jixian Block

    样品号质量/
    g
    密度/
    (g·cm−3)
    体积/
    cm3
    孔隙率/
    %
    含水饱
    和度/
    %
    原始天然气
    体积系数Bg
    游离气含量/

    (m3·t−1)
    实测含气
    量/
    (m3·t−1)
    总含气量/

    (m3·t−1)
    P20-Y318501.381340.586.817.740.00375112.1422.8735.01
    P20-Y419501.361433.825.9510.030.00375110.4923.7234.21
    P20-Y517951.351329.636.1313.500.00375110.4725.1135.58
    下载: 导出CSV

    表  3  8号煤渗透率测试结果

    Table  3  Permeability test results for the No. 8 coal seam

    井号样品深度/m渗透率/10−3 μm2裂隙发育情况测试方法
    D40 1866.00 0.053 注入/压降测试
    D7-5 2233.00 0.054
    P19 2117.62 0.004 裂隙不发育 克氏渗透率
    H12 2141.72 0.030
    H13 2254.17 0.271
    2257.32 0.008
    H15 2405.30 0.018
    2409.94 0.005
    H3 2168.00 0.009
    H4 2167.00 0.013
    平均 2202.01 0.047
    P22-1 2141.00 1.142 裂隙发育
    H7 2283.16 1.401
    H9 2336.93 1.749
    H2 2230.18 0.318
    平均 2247.82 1.153
    下载: 导出CSV

    表  4  深层煤层气井压裂裂缝监测结果

    Table  4  Monitoring results of fracturing fractures in deep coalbed methane wells

    井号缝长/m缝宽/m改造面积/m2
    D2-2AX2 310 100 24 335
    D52 310 160 38 936
    D43 350 140 38 465
    D3-7X2 320 80 20 096
    平均 322.5 120 30 458
    下载: 导出CSV

    表  5  深层煤层气井EUR预测

    Table  5  EUR prediction of deep coalbed methane wells

    井号2021年11月底
    日产气量/m3
    累产气量/
    104 m3
    单井EUR/
    104 m3
    D3-7X2 1 309 199 311
    D4-8X1 632 46 84
    D52 1 529 85 269
    D6-10X1 2 394 180 496
    D7-5 4 350 199 817
    平均 1 760.6 115 395
    下载: 导出CSV
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  • 收稿日期:  2021-12-15
  • 修回日期:  2022-02-16
  • 录用日期:  2022-02-22
  • 发布日期:  2022-03-01
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