【摘要】 基于了解煤体增透与抽采瓦斯的关系的目的,采用了液态二氧化碳致裂增透技术对煤体进行增透。对比分析了煤体增透前后抽采瓦斯的浓度和流量,得出了经过液态二氧化碳致裂增透以后的煤层平均抽采瓦斯浓度提高近3.5倍,平均抽采瓦斯流量提高3～5倍。研究结果表明:煤体增透能促使煤层裂隙发育,增加煤层透气性,提高瓦斯抽采率。更多还原

【Abstract】 Based on the purpose of understanding the relationship between coal permeability enhancement and gas extraction, liquid carbon dioxide fracturing and permeability enhancement technology is used to enhance the permeability of coal. The gas concentration and flow rate before and after permeability enhancement are compared and analyzed. It is concluded that the average gas concentration and gas flow rate after permeability enhancement by liquid carbon dioxide fracturing increase by nearly 3.5 times and 3～5 times respectively. The results show that the permeability enhancement of coal can promote the development of coal seam cracks, increase the permeability of coal seam and improve the gas extraction rate.更多还原