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    黄陵矿区煤油气共生煤层“一核三翼”瓦斯治理技术体系构建与应用

    Construction and application of “one core and three wings” gas control technology system in coal-oil-gas symbiotic coal seam of Huangling mining area

    • 摘要: 黄陵二号煤矿作为黄陇煤田典型煤油气共生矿井,随着开采深度与产能提升,瓦斯涌出量显著增加,顶底板油型气异常涌出问题突出,严重制约了煤矿安全高效开采。在分析该矿2号煤层瓦斯地质特征的基础上,指出其瓦斯赋存受地质构造控制显著,中部向斜核部为高瓦斯区(含量>4 m3/t),顶底板发育4个油型气主含气层(压力2.98~3.17 MPa),煤层透气性低、钻孔衰减快,常规抽采技术适应性不足。针对上述问题,构建了以“区域超前治理”为核心,集成“采煤工作面分阶段治理、掘进工作面动态防控、油型气协同治理”的“一核三翼”瓦斯治理技术体系,配套制度、装备与管理保障机制,实现“探−抽−掘−采”一体化协同。通过工业试验验证了本煤层定向钻孔水力压裂使抽采浓度提升1.35~2.57倍;超高压水射流割缝−注氮驱替使抽采纯量提升53.09%;可控冲击波增透使卸压范围扩展至3 m,油型气抽采浓度提升2倍。现场应用表明,215、422工作面抽采率达81%~84%,掘进面瓦斯浓度控制在0.5%以下,有效提升了瓦斯抽采效率与安全性。

       

      Abstract: Huangling No. 2 Coal Mine, as a representative coal-oil-gas symbiotic coal seam mine in the Huanglong coalfield, has experienced a significant increase in gas emission with the progressive increase in mining depth and production capacity. In particular, the abnormal emission of oil-type gas from the roof and floor has become increasingly prominent, which severely constrains the safe and efficient coal mining operations. Based on a systematic analysis of the gas geological characteristics of the No. 2 coal seam, it is identified that gas occurrence is significantly controlled by geological structures. Specifically, the synclinal core in the central region constitutes a high-gas zone with gas content exceeding 4 m³/t. Meanwhile, four major oil-type gas-bearing strata are developed in the roof and floor, with pressures ranging from 2.98 to 3.17 MPa. Furthermore, the coal seam is characterized by low permeability and rapid borehole attenuation, thereby rendering conventional gas extraction techniques insufficiently effective. To address these challenges, a comprehensive gas governance system is proposed, centered on “regional advanced treatment” and integrating three key components: staged governance in the longwall face, dynamic prevention and control in the heading face, and collaborative prevention and control technology for oil-type gas. This “one core and three wings” framework is further supported by coordinated institutional, equipment, and management mechanisms, thereby enabling an integrated “exploration–extraction–drivage–mining” process. Field-scale industrial tests demonstrate that directional borehole hydraulic fracturing in the target coal seam increases the gas extraction concentration by 1.35–2.57 times. Moreover, the combined application of ultra-high-pressure water jet slotting and nitrogen injection flooding enhances the net gas extraction rate by 53.09%. In addition, controllable shock wave permeability enhancement extends the pressure relief range to 3 m and doubles the extraction concentration of oil-type gas. Field application results indicate that the gas extraction rates of the 215 and 422 working faces reach 81%–84%, while the gas concentration in the heading face is effectively maintained below 0.5%. Consequently, both the efficiency and safety of gas extraction are significantly improved.

       

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