| Autor: |
Mingjie Guo, Wenbing Guo, Ruifu Yuan, Yi Tan, Erhu Bai |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Energy Science & Engineering, Vol 12, Iss 10, Pp 4323-4334 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2050-0505 |
| DOI: |
10.1002/ese3.1883 |
| Popis: |
Abstract Laying long horizontal borehole (LHB) in mining‐induced strata fractures for coal‐bed gas drainage in the goaf is a pivotal method for eliminating safety hazards, preventing atmospheric pollution, and realizing gas utilization. A crucial premise of this method is to determine the effective drainage range of the borehole, a key parameter directly affecting boreholes spacing and drainage efficiency. In this study, a model of gas seepage during LHB drainage within a circular equipotential boundary was presented, and the complex variable function theory and the mirror principle were adopted for deriving the complex potential function of gas flow under the condition of LHB drainage and the drainage volume function of a single center borehole. Besides, the main indicator to determinate the effective drainage range of LHB was given. Specifically, the indicator refers to the distance between the turning point (the point at which the change rate of the gas flow velocity is −0.002 around the borehole) and the center of the borehole. Subsequently, numerical simulation was conducted to obtain the effective drainage range of LHB within mining‐induced fractures of overlying strata, that is, 4 m |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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