水力压裂技术在提高煤层瓦斯抽采效果的研究与应用

Research and application of hydraulic fracturing technology in improving coal seam gas drainage effect

为了提高低透气性煤层瓦斯渗透率和瓦斯抽采效果,利用模拟软件计算了煤层水力压裂孔径和地应力对压裂效果的影响,并进行了工程试验。模拟结果表明,大压裂孔孔径对压裂效果起到促进作用,高地应力对压裂效果起到抑制作用;现场试验结果表明,在煤层中实施水力压裂增透技术后,钻孔瓦斯涌出量衰减度降低了67.65%,煤层透气性提高了30多倍,表明在低透气性煤层中实施水力压裂增透技术能大幅度提高煤层瓦斯抽采效果。

In order to improve the gas permeability and gas drainage effect of low permeability coal seams,the simulation software was used to calculate the influence of hydraulic fracturing aperture and ground stress on fracturing effect,and engineering tests were carried out.The simulation results indicate that the large pore size of the fracturing hole promotes the fracturing effect,while the high ground stress suppresses the fracturing effect.The field test results show that after the implementation of hydraulic fracturing anti-reflection technology,the attenuation intensity of borehole gas emission is reduced by 67.65%,and the permeability of coal seam is increased by more than 30 times,indicating that the hydraulic fracturing anti-reflection technology has a good effect on promoting the gas drainage effect of coal seam.