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过采空区抽采下组煤煤层气技术及工程应用初探——以晋城寺河井田为例

李军军 李国富 郝海金 郝春生 王争

李军军, 李国富, 郝海金, 郝春生, 王争. 过采空区抽采下组煤煤层气技术及工程应用初探——以晋城寺河井田为例[J]. 煤田地质与勘探, 2021, 49(4): 96-104. doi: 10.3969/j.issn.1001-1986.2021.04.012
引用本文: 李军军, 李国富, 郝海金, 郝春生, 王争. 过采空区抽采下组煤煤层气技术及工程应用初探——以晋城寺河井田为例[J]. 煤田地质与勘探, 2021, 49(4): 96-104. doi: 10.3969/j.issn.1001-1986.2021.04.012
LI Junjun, LI Guofu, HAO Haijin, HAO Chunsheng, WANG Zheng. Technology of across-goaf drainage of coalbed methane from a lower coal seam group and its primary application: Taking Sihe mine field as an example[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(4): 96-104. doi: 10.3969/j.issn.1001-1986.2021.04.012
Citation: LI Junjun, LI Guofu, HAO Haijin, HAO Chunsheng, WANG Zheng. Technology of across-goaf drainage of coalbed methane from a lower coal seam group and its primary application: Taking Sihe mine field as an example[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(4): 96-104. doi: 10.3969/j.issn.1001-1986.2021.04.012

过采空区抽采下组煤煤层气技术及工程应用初探——以晋城寺河井田为例

doi: 10.3969/j.issn.1001-1986.2021.04.012
基金项目: 

国家科技重大专项任务 2016ZX05067-001-008

山西省科技重大专项项目 20181101013

详细信息
    第一作者:

    李军军,1984年生,男,河北唐山人,硕士,高级工程师,从事煤与煤层气共采理论与方法方面的研究工作. E-mail:qaljj@163.com

  • 中图分类号: P618.11

Technology of across-goaf drainage of coalbed methane from a lower coal seam group and its primary application: Taking Sihe mine field as an example

  • 摘要: 晋城矿区寺河井田3号煤层经多年的煤矿开采,形成了大面积的采空区,大面积的卸压提高了下组煤(9号、15号)的渗透率,但由于采空区阻隔和煤层气地面预抽技术的局限,致使下组煤煤层气尚未得到有效抽采。为保证煤矿的安全生产和产能的释放,结合采空区特征,采用过采空区钻完井及压裂工艺新技术,分析施工参数及后期产能情况,评价过采空区抽采下组煤煤层气技术的应用效果。结果表明:地面钻井开发过采空区下组煤煤层气资源时,应首先进行井位优选及井身结构优化,以保证钻井的成功率;采用氮气置换套管钻井工艺及低压易漏注浆加固等穿采空区钻完井技术,不仅可以有效降低采空区煤层气自燃甚至爆炸风险,而且保证了穿采空区段固井质量;优化采空区下组煤层压裂施工参数并设计不同井位的煤层气井压裂工艺,有效扩展裂缝长度,同时也避免了“压穿”等压裂事故发生;精细化排采管控措施可以有效扩大泄流半径,提高单井产能。现场一百余口过采空区煤层气井排采实践表明,单井最高产气量达到8 832 m3/d,日均产气量达到2 694 m3,验证了过采空区抽采下组煤煤层气技术可行,可推广应用。

     

  • 图  3号煤采空区范围

    Fig. 1  Range of the goaf of No.3 coal seam

    图  采空区覆岩变形特征

    Fig. 2  Deformation characteristics of overburden of the goaf

    图  采空区及围岩垂直应力分布曲线[17]

    Fig. 3  Vertical stress distribution curve of goaf and surrounding rock

    图  煤岩应力分区

    Fig. 4  Stress zoning of coal and rock

    图  井身结构

    Fig. 5  Structure of the wellbore

    图  氮气钻井工艺流程

    Fig. 6  Nitrogen drilling process flow chart

    图  低压易漏注浆加固位置

    Fig. 7  Low pressure leakage grouting reinforcement position

    图  采动影响下地应力及渗透率分布情况

    Fig. 8  Distribution of in-situ stress and permeability under the influence of mining

    图  压裂层位优选

    Fig. 9  Fracturing horizon optimization

    图  10  套压和液面位置与产气量关系

    Fig. 10  Relation among casing pressure, liquid level position and gas production rate

    图  11  过采空区煤层气井产能

    Fig. 11  Productivity of across-goaf wells

    图  12  典型煤层气井排采曲线

    Fig. 12  Drainage curve of typical CBM wells

    表  1  过采空区井与常规井压裂参数比较

    Table  1  Comparison of fracturing parameters between wells in goaf and conventional wells

    类别 目的层位 布孔
    密度/(个·m–1)
    压裂液量/m3 0.15~0.30 mm石英砂体积/m3 0.45~0.90 mm石英砂体积/m3 平均砂比/%
    常规井 9号+15号煤 24 559 10 20 6.7
    过采空区井 9号+9号煤底板1 m 9号:16 455 5 10 5.0
    底板:24
    15号煤 24 559 10 20 6.7
    下载: 导出CSV

    表  2  过采空区井裂缝监测分析结果

    Table  2  Analysis results of crack monitoring of cross-goaf wells

    压裂层 裂缝参数
    主走向NE/(°) 最大裂缝长度/m 裂缝面积/105 m2 特征
    9号煤 80 370 1.2 两翼为主裂缝,由多条子缝构成的缝网
    15号煤 130 450 1.4
    下载: 导出CSV

    表  3  过采空区井煤层注入/压降试井分析结果

    Table  3  Well test analysis results of injection/pressure drop of across-goaf wells

    参数 数值
    9号煤 15号煤
    储层压力pi/MPa 0.64 1.03
    储层压力梯度/(MPa·m–1) 2.69×10–3 3.85×10–3
    渗透率k/10–3 μm2 10.81 1.22
    表皮系数S 10.22 0.65
    调查半径Ri/m 40.09 13.72
    储层温度t/℃ 15.97 16.40
    下载: 导出CSV
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  • 收稿日期:  2020-11-26
  • 修回日期:  2020-06-11
  • 发布日期:  2021-08-25
  • 网络出版日期:  2021-09-10

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