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大宁−吉县区块深层煤层气井酸化压裂产气效果影响因素分析

李曙光 王红娜 徐博瑞 甄怀宾 王成旺 袁朴

李曙光,王红娜,徐博瑞,等. 大宁−吉县区块深层煤层气井酸化压裂产气效果影响因素分析[J]. 煤田地质与勘探,2022,50(3):165−172. doi: 10.12363/issn.1001-1986.21.12.0800
引用本文: 李曙光,王红娜,徐博瑞,等. 大宁−吉县区块深层煤层气井酸化压裂产气效果影响因素分析[J]. 煤田地质与勘探,2022,50(3):165−172. doi: 10.12363/issn.1001-1986.21.12.0800
LI Shuguang,WANG Hongna,XU Borui,et al. Influencing factors on gas production effect of acid fractured CBM Wells in deep coal seam of Daning-Jixian Block[J]. Coal Geology & Exploration,2022,50(3):165−172. doi: 10.12363/issn.1001-1986.21.12.0800
Citation: LI Shuguang,WANG Hongna,XU Borui,et al. Influencing factors on gas production effect of acid fractured CBM Wells in deep coal seam of Daning-Jixian Block[J]. Coal Geology & Exploration,2022,50(3):165−172. doi: 10.12363/issn.1001-1986.21.12.0800

大宁−吉县区块深层煤层气井酸化压裂产气效果影响因素分析

doi: 10.12363/issn.1001-1986.21.12.0800
基金项目: 国家科技重大专项项目(2016ZX05042)
详细信息
    第一作者:

    李曙光,1967年生,男,浙江余姚人,博士,教授级高级工程师,从事煤层气、致密气、页岩气地质工程一体化评价、储层改造工艺研究、压裂液体系配方研发等研究工作. E-mail:57990696@qq.com

  • 中图分类号: TE-9

Influencing factors on gas production effect of acid fractured CBM Wells in deep coal seam of Daning-Jixian Block

  • 摘要: 大宁−吉县区块深层8号煤层面积大、厚度大、分布广、煤层气资源富集,体积酸压后试采获得突破,但试采井产能差异大,产能主控因素不明确,严重制约煤层气开发进程。针对大宁−吉县区块2 000 m以深的上石炭统本溪组8号煤层试采井,从地质条件、酸压施工和排采制度中选取28个典型评价指标,运用灰色关联方法对煤层气井酸压后产能进行敏感性分析并提出相应技术对策。结果表明:酸压施工因素对产能的影响高于地质因素和排采因素;砂量、酸量、见气前产水指数、泥质含量和阵列感应电阻率是影响该区块气井产能的主控因素,可将阵列感应电阻率和泥质含量作为筛选有利区的重要指标;提出采用低密度、低粒径支撑剂提高支撑剂运移距离与支撑裂缝长度;控制排采速度不超过200 m3/d,以保证深层煤层气平稳连续产出。该研究可为深层煤层气有利区筛选、施工参数优化以及排采制度调整提供参考。

     

  • 图  深层8号煤裂隙发育照片

    Fig. 1  Development of cleats and fissures in the deep No.8 coal seam

    图  典型井排采曲线

    Fig. 2  Typical well drainage curves

    图  8号煤顶板构造及分析井位置

    Fig. 3  Location map of analysis wells

    表  1  10%盐酸浸泡前后煤岩抗压强度变化

    Table  1  Changes of coal compressive strength before and after soaking in 10% hydrochloric acid

    岩心
    编号
    抗压强度/MPa备注
    天然状态酸化后
    煤心130.2728.80均为紧邻钻取岩心对比
    煤心227.5222.05
    煤心324.9515.78
    下载: 导出CSV

    表  2  10%盐酸浸泡前后煤岩气测渗透率对比

    Table  2  Comparison of measured permeability of coal and gas before and after soaking in 10% hydrochloric acid

    岩心编号渗透率/10−3 μm2
    原始状态浸泡后浸泡后/原始状态比值
    煤心40.054 70.554 510.14
    煤心50.014 10.124 98.86
    煤心60.059 80.956 115.99
    煤心70.013 30.155 611.70
    下载: 导出CSV

    表  3  试验井的地质、工程和生产参数

    Table  3  Geological, engineering and production parameters of test wells

    井号地质参数
    电阻率/
    (Ω·m)
    泥质质量
    分数/%
    储层有效
    厚度/m
    射孔厚
    度/m
    自然伽
    马/API
    声波时差/
    (μs·m−1)
    含气量/
    (m3·t−1)
    高程/
    m
    储层压
    力/MPa
    密度/
    (g·cm−3)
    临界解吸压
    力/MPa
    孔隙
    率/%
    临储比井径扩
    大率/%
    构造
    曲率
    DJ3-2 588 12.3 9.8 5.5 54.5 363 28.2 −710 19.7 1.45 19.7 4.34 1.00 0.01 0.10
    DJ3-4 535 12.3 8.9 6.0 48.3 382 27.5 −917 21.3 1.45 21.3 4.40 1.00 6.16 0.07
    DJ3-6 648 15.5 7.5 3.5 45.4 397 27.2 −1 089 22.9 1.43 22.8 4.28 1.00 6.02 0.09
    DJ3-7 522 14.5 7.6 5.0 46.3 376 27.8 −955 22.2 1.49 22.2 4.58 1.00 1.48 0.10
    DJ6-10 279 15.1 7.9 4.5 35.4 401 28.7 −1 124 20.8 1.50 18.8 4.34 0.90 9.65 0.12
    DJ7-5 560 17.7 7.3 5.0 49.7 404 29.2 −996 22.2 1.47 20.8 2.80 0.93 12.24 0.08
    DJ4-8 77 16.9 7.6 4.0 58.5 390 27.7 −1 018 22.1 1.42 19.5 4.94 0.88 19.90 0.13
    下载: 导出CSV
    井号酸压施工参数排采参数
    每米加
    砂强度/
    (m3·m–1)
    总砂
    量/m3
    氢离子
    量/109 mol
    施工排量/
    (m3·min–1)
    总液
    量/m3
    监测裂
    缝破裂
    面积/m2
    清洁液量
    加液强度/
    (m·m–3)
    清洁液
    量/m3
    前置液
    占压裂
    液比值
    平均砂
    比/%
    停泵压
    力/MPa
    见气前
    产水指数/
    (m3·d−1·MPa−1)
    产气时井
    底流压/
    MPa
    DJ3-24.0840.01.5511.51 905.030 225153.881 5080.212.540.025.4417.90
    DJ3-42.1412.70.837.51 011.520 48987.695200.495.428.77.6320.40
    DJ3-61.4410.83.217.51 346.083 790132.939970.261.731.522.9420.27
    DJ3-75.0338.22.879.81 135.018 84064.744920.5710.035.28.4618.13
    DJ6-103.9231.04.5510.51 290.029 673108.868600.334.139.69.3415.34
    DJ7-57.2653.05.5512.01 879.076 381158.631 1580.384.816.846.5520.90
    DJ4-80.201.52.416.01 510.085 376151.321 1500.242.0037.65.3515.63
    下载: 导出CSV

    表  4  煤层气井酸压后产能灰色关联度及排序

    Table  4  Grey correlation degree and ranking of CBM well productivity after acid fracturing

    参数类别影响因素关联度排序参数类别影响因素关联度排序
    酸压每米加砂强度0.961 91地质自然伽马0.806 115
    酸压总砂量0.948 72地质声波时差0.803 616
    排采见气前米产水指数0.915 03地质含气量0.802 817
    酸压酸液用量0.912 74地质高程0.798 918
    酸压施工排量0.870 65地质储层压力0.798 619
    酸压总液量0.863 76地质密度0.791 320
    地质电阻率0.857 87地质临界解吸压力0.789 821
    地质泥质含量0.846 08地质临储比0.780 722
    酸压监测裂缝破裂面积0.842 39地质井径扩大率0.734 723
    酸压清洁液量加液强度0.839 510地质构造曲率0.726 824
    地质储层有效厚度0.831 611酸压平均砂比0.675 025
    酸压清洁液量0.827 312地质测井孔隙率0.657 826
    酸压前置液占压裂液比值0.821 713排采井底流压降0.600 227
    地质射孔厚度0.806 214酸压停泵压力0.582 528
    下载: 导出CSV

    表  5  煤层气井酸压后产能影响因素排序

    Table  5  Sequence of factors affecting productivity of coalbed methane wells after acid fracturing

    类别关联度平均值排序
    酸压0.831 41
    地质0.788 82
    排采0.757 63
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-12-14
  • 修回日期:  2022-01-20
  • 发布日期:  2022-03-25
  • 网络出版日期:  2022-03-19

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