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淮北杨柳煤矿岩浆侵蚀严重,在岩浆侵蚀区域发生过地面钻井喷“瓦斯-水”事故,严重破坏了地面瓦斯抽采系统。采用实验室试验、理论计算等手段分析了岩浆岩床对下伏煤体的热演化作用,建立了离层瓦斯压力和流量计算模型,研究了下伏离层瓦斯灾变机制,并提出了工程防治方法。研究结果表明,岩浆侵入的热演化作用提高了煤的变质程度,促进了下伏煤体的二次生烃,煤层瓦斯含量大大增加,与岩浆岩床的封盖作用相叠加,造成瓦斯局部富集,为离层瓦斯包的形成奠定了物质基础;喷孔事故发生时作为主关键层的第2层岩浆岩床产生突然弯曲下沉运动但未破断,离层空间减小0.58万m~3,迫使离层瓦斯压力迅速增至1.68 MPa,地面钻井的瓦斯流量为178.4 m~3/min,共喷出瓦斯量35.3万m~3,导致该离层瓦斯灾变事故;提出并应用了岩浆岩床下伏煤层瓦斯综合立体抽采技术,能够有效防止离层瓦斯的二次灾变,保证了矿井的安全生产。
The Yangliu coal mine in Huaibei suffered from serious magmatic erosion. In the magma erosion area, a surface drilling blowout occurred and the “gas-water” accident seriously damaged the ground gas drainage system. The thermal evolution of the underlying coal bed is analyzed by means of laboratory tests and theoretical calculations. The calculation model of gas pressure and flow rate in the subterranean formation is established, and the mechanism of underlying gas disaster is studied. The engineering prevention and control methods are also proposed . The results show that the thermal evolution of magma intrusions improves the degree of coal metamorphism and promotes the secondary hydrocarbon generation of the underlying coal. The gas content of the coal seam increases greatly and overlaps the capping of the magmatic bedrock, resulting in local enrichment of gas , Which laid the material foundation for the formation of gas packs. When the injection hole accident occurred, the second magmatic bed of rock as the key layer produced sudden bending and sinking but did not break, and the space of the layer decreased by 58,800 m 3, forcing The gas pressure in the outburst rapidly increases to 1.68 MPa and the gas flow in the surface drilling is 178.4 m 3 / min, with a total gas output of 353,000 m 3, leading to the devastating gas disasters; Coal seam gas comprehensive three-dimensional pumping technology, can effectively prevent the secondary disastrous gas outfall, and ensure the safety of mine production.