Underground segmentation point hydraulic fracturing antireflection for low-permeability coal seams
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摘要: 通過數值分析和現場試驗的手段分析了井下低透氣性煤層分段點式水力壓裂的原理和過程.井下分段水力壓裂意在改變傳統壓裂的受力方式,使煤體多點受力,相互作用,最后產生壓裂的效果.經過在城山煤礦西二采區水力壓裂孔的試驗,在壓裂半徑為5~7m條件下,得出了試驗地點臨界注水壓力為14MPa,水壓在14~20MPa進行分段點式水力壓裂較為適宜,試驗過程簡單易行,在現有條件下壓裂可在5 min內完成,試驗地點壓裂后鉆孔平均抽放瓦斯流量和體積分數明顯提高.Abstract: The principle and process of underground segmentation point hydraulic fracturing for low-permeability coal seams were studied by means of numerical analysis and field test.Underground segmentation hydraulic fracturing is intended to change the traditional force way to make coal more force and interaction,and finally to produce the effect of fracturing.The hydraulic fracturing test at the west second mining area of Chenshan Coal Mine in northeastern China shows that when the fractured radius is 5 to 7m,the critical injection pressure is 14 MPa,and it is suitable for the hydraulic fracturing that the injection pressure is 14 to 20 MPa.The test procedure is so simple that the hydraulic fracturing can be completed within 5 min,and the average gas flow and volume fraction of gas drainage are significantly increasing after the hydraulic fracturing.
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Key words:
- coal mines /
- mining /
- coal gas /
- drainage /
- hydraulic fracturing /
- gas permeability
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