Jizhong Energy Fengfeng Group Co., Ltd.

峰峰集团九龙矿2号煤埋深大，瓦斯含量高，为保证工作面安全回采，开展了瓦斯卸压增透技术的研究。与其他致裂方式相比，超高压水力切缝卸压增透技术的成本低、安全性高，对地质条件的适应性强，是一种理想的低渗煤层增透方式。该技术可破坏钻孔的“瓶塞效应”，促进裂缝的产生、发育和贯通，由此提高透气性，加大煤层中瓦斯的释放。在15249N工作面的现场应用表明，割缝钻孔单刀出煤量0.78 t，等效割缝半径1.89 ~ 2.31 m，较普通钻孔瓦斯抽采浓度提升1.6倍，瓦斯抽采纯量提升3.79倍，取得了较好的增透效果。

No.2 coal seam of Fengfeng Group Jiulong Mine has a large buried depth and high gas content. In order to ensure the safe mining of the working face, the research on gas pressure relief and permeability enhancement technology was carried out. Compared with other fracturing methods, the ultra-high pressure hydraulic slotting pressure relief and permeability enhancement technology had low cost, high safety, and strong adaptability to geological conditions. It was an ideal permeability enhancement method for low permeability coal seams. This technology could destroy the ' bottle plug effect ' of boreholes, promote the generation, development and penetration of cracks, thereby improving the permeability and increasing the release of gas in coal seams. The field application of in No.15249N Face showed that the single-cut coal output of slotted borehole was 0.78 t, and the equivalent slotted radius was 1.89 ~ 2.31 m, which was 1.6 times higher than that of ordinary borehole gas extraction concentration and 3.79 times higher than that of gas extraction pure quantity, which had achieved good antireflection effect.

郭运海. 深部高突低渗煤层超高压水力割缝卸压增透技术实践[J]. 煤炭与化工, 2024, 47(7): 119-122，128..

Guo Yunhai. Practice of ultra-high pressure hydraulic slotting pressure relief and permeability enhancement technology in deep high outburst and low permeability coal seam. CCI, 2024, 47(7): 119-122，128..