高瓦斯低渗煤层水力造穴增透技术优化研究
Research on optimization of hydraulic flushing and permeability enhancement technology in high gas and low permeability coal seam
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摘要: 为解决高瓦斯低透气性煤层瓦斯抽采浓度低的问题，探究低渗煤层水力造穴过程中各特征参数变化对卸压效果的影响，开展了水力造穴特征参数优化试验。首先，通过单一因素试验研究了不同出煤量、造穴次数及孔间距对水力造穴效果的影响；其次，根据Box-Benhnken理论设计了17组试验，对结果进行方差分析并建立了合适的二次模型；然后，通过响应曲面进一步分析了3个影响因素对试验结果的显著性。最后，利用Design-Expert软件确定水力造穴特征参数最优组合为：单孔出煤量0.7 t，单孔造穴次数12次，孔间距8 m。选取潞安集团某矿进行现场工业性试验，通过对比同一位置试验造穴孔与普通造穴孔的瓦斯抽采浓度与瓦斯抽采量发现：试验孔瓦斯抽采量提高了3倍以上，瓦斯抽采浓度提高了2倍以上，达到了卸压的目的。Abstract: In order to solve the problem of low gas drainage concentration in high-gas and low-permeability coal seams, the influence of various characteristic parameters on the pressure relief effect in the process of hydraulic flushing in low-permeability coal seams was explored. A study on the optimization of characteristic parameters of hydraulic flushing was carried out. First, the influence of different coal output, the number of holes and the hole spacing on the effect of hydraulic flushing is studied through single factor experiments. Secondly, according to Box-Benhnken theory, 17 sets of experiments were designed, and the results were analyzed by variance to establish a suitable quadratic model. Then, the significance of the three influencing factors on the experimental results was further analyzed by response surface. Finally, the design-expert software was used to obtain the optimal combination of hydraulic flushing characteristic parameters: single coal output 0.7 t, single hole flushing times of 12, and hole spacing 8 m. A mine of Lu’an Group was selected for field industrial test. By comparing the gas drainage concentration and the gas drainage rate of the test hole and the ordinary hole in the same location, it was shown that the gas drainage volume in the test hole has been increased by more than 3 times, and the gas drainage concentration has been increased by more than 2 times.
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