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Research on the Optimized Layout of Boreholes in Low‐Permeability Coal Seams to Eliminate Gas Drainage Blank Zones.

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Title: Research on the Optimized Layout of Boreholes in Low‐Permeability Coal Seams to Eliminate Gas Drainage Blank Zones.
Authors: Huo, Jingjing1 (AUTHOR), Sun, Hao2 (AUTHOR), Jiang, Xiaofeng2 (AUTHOR) 13398434861@163.com, Lu, Shouqing (AUTHOR) lushouqing@qut.edu.cn
Source: Geofluids. 3/28/2026, Vol. 2026, p1-9. 9p.
Subject Terms: *Boreholes, *Gas extraction, *Radius (Geometry), *Mathematical models, *Mathematical optimization, *Coalbed methane, *Coal mining
Geographic Terms: China
Abstract: With the increasing depth and complexity of coal mining in China, the gas control in coal seam has become increasingly important. Gas predrainage through boreholes is an effective means of gas control, and the effective drainage radius of boreholes is a significant index for gas drainage. Taking Sijiazhuang Coal Mine as the research object, the gas drainage radius of seam 15 at different drainage times have been measured. A gas–solid coupling model for coalbed gas drainage has been established by governing equations between porosity, permeability, stress, and seepage, which was applied to optimize the layout of coalbed gas drainage boreholes. The results show that the drainage radius of conventional boreholes in Sijiazhuang Coal Mine increases with time, namely, 3.0, 4.0, 4.4, and 5.0 m on 35, 70, 100, and 120 days, respectively. The model validation results are consistent with the field measured values, confirming the feasibility of the established model in simulating gas drainage effectiveness. When the borehole spacing is less than or equal to 3 m, the effective drainage rate reaches 100% with no blind zones; when the spacing is greater than or equal to 3.5 m, the effective drainage rate drops below 82.7% and blind zones appear. Therefore, the optimal spacing should be controlled within 3 m. The comparison of layout patterns shows that under the same number of boreholes, the double‐row staggered (three‐flower) layout has a larger negative pressure acting area and more uniform pressure reduction in the roof and floor compared with the single‐row layout, with the time to meet standards shortened from 58 to 55 days, significantly improving the drainage efficiency. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 192593296
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Research on the Optimized Layout of Boreholes in Low‐Permeability Coal Seams to Eliminate Gas Drainage Blank Zones.
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  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Huo%2C+Jingjing%22">Huo, Jingjing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Hao%22">Sun, Hao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Xiaofeng%22">Jiang, Xiaofeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> 13398434861@163.com</i><br /><searchLink fieldCode="AR" term="%22Lu%2C+Shouqing%22">Lu, Shouqing</searchLink> (AUTHOR)<i> lushouqing@qut.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Geofluids%22">Geofluids</searchLink>. 3/28/2026, Vol. 2026, p1-9. 9p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Boreholes%22">Boreholes</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas+extraction%22">Gas extraction</searchLink><br />*<searchLink fieldCode="DE" term="%22Radius+%28Geometry%29%22">Radius (Geometry)</searchLink><br />*<searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br />*<searchLink fieldCode="DE" term="%22Mathematical+optimization%22">Mathematical optimization</searchLink><br />*<searchLink fieldCode="DE" term="%22Coalbed+methane%22">Coalbed methane</searchLink><br />*<searchLink fieldCode="DE" term="%22Coal+mining%22">Coal mining</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22China%22">China</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: With the increasing depth and complexity of coal mining in China, the gas control in coal seam has become increasingly important. Gas predrainage through boreholes is an effective means of gas control, and the effective drainage radius of boreholes is a significant index for gas drainage. Taking Sijiazhuang Coal Mine as the research object, the gas drainage radius of seam 15 at different drainage times have been measured. A gas–solid coupling model for coalbed gas drainage has been established by governing equations between porosity, permeability, stress, and seepage, which was applied to optimize the layout of coalbed gas drainage boreholes. The results show that the drainage radius of conventional boreholes in Sijiazhuang Coal Mine increases with time, namely, 3.0, 4.0, 4.4, and 5.0 m on 35, 70, 100, and 120 days, respectively. The model validation results are consistent with the field measured values, confirming the feasibility of the established model in simulating gas drainage effectiveness. When the borehole spacing is less than or equal to 3 m, the effective drainage rate reaches 100% with no blind zones; when the spacing is greater than or equal to 3.5 m, the effective drainage rate drops below 82.7% and blind zones appear. Therefore, the optimal spacing should be controlled within 3 m. The comparison of layout patterns shows that under the same number of boreholes, the double‐row staggered (three‐flower) layout has a larger negative pressure acting area and more uniform pressure reduction in the roof and floor compared with the single‐row layout, with the time to meet standards shortened from 58 to 55 days, significantly improving the drainage efficiency. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1155/gfl/7298808
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Boreholes
        Type: general
      – SubjectFull: Gas extraction
        Type: general
      – SubjectFull: Radius (Geometry)
        Type: general
      – SubjectFull: Mathematical models
        Type: general
      – SubjectFull: Mathematical optimization
        Type: general
      – SubjectFull: Coalbed methane
        Type: general
      – SubjectFull: Coal mining
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: Research on the Optimized Layout of Boreholes in Low‐Permeability Coal Seams to Eliminate Gas Drainage Blank Zones.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Huo, Jingjing
      – PersonEntity:
          Name:
            NameFull: Sun, Hao
      – PersonEntity:
          Name:
            NameFull: Jiang, Xiaofeng
      – PersonEntity:
          Name:
            NameFull: Lu, Shouqing
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          Dates:
            – D: 28
              M: 03
              Text: 3/28/2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 14688115
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            – Type: volume
              Value: 2026
          Titles:
            – TitleFull: Geofluids
              Type: main
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