CO2致裂器深孔预裂煤体裂隙扩展范围试验研究
Experimental Study on Fracture Extension Range of Deep Hole Pre-splitting Coal Body by Carbon Dioxide Fracturing Device
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摘要: 为了得出CO2致裂器串接进行深孔预裂的影响半径,在山西某煤矿3#煤层进行了2组试验,研究了在抽采区和未抽采区2种不同工况下深孔预裂的影响半径,并结合理论计算的结果进行了分析,结果表明,利用串接CO2致裂器进行深孔爆破,钻孔深度100 m的情况下,影响半径约5 m,为致裂增透方案的设计和现场施工提供了有力的技术支持。Abstract: In order to obtain the influence radius of deep-hole pre-cracking by tandem type commection of carbon dioxide fracturing devices, two groups of experiments were carried out in No.3 coal seam of a coal mine in Shanxi province to study the influence radius under two different working conditions of extraction area and non-extraction area, and combined with the theoretical calculation, the results were analyzed. The results show that the influence radius is about 5 m when the drilling depth is 100 m through tandem type commection of carbon dioxide fracturing devices. It provides a strong technical support for the fracturing and permeability improvement design and field construction.
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