液态CO2相变致裂增透强化抽采技术研究
投稿时间:2018-06-13  修订日期:2018-06-13  点此下载全文
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作者单位E-mail
何福胜 山西西山晋兴能源有限责任公司斜沟煤矿 bijianyi625@126.com 
毕建乙 山西西山晋兴能源有限责任公司斜沟煤矿 657107792@qq.com 
王海东 华北科技学院 安全工程学院  
基金项目:国家自然科学基金资助项目(50704024)
中文摘要:针对高瓦斯低透气性煤层效率低,提出CO2相变致裂爆破增透技术来提高抽采效率。通过理论分析和FLAC3D数值模型研究分析液态CO2相变致裂爆破煤层增透效果,并进行了现场试验,结果证明:当爆破参数为CO2爆破器间距5m、爆破孔间距7.5m,此时多孔连续爆破煤层增透效果最好;爆破后煤体透气性距爆破孔由远及近的变化规律为非线性增加。18205材料巷实施液态CO2相变致裂爆破增透技术后,透气性系数增大了16.89~20.97倍,平均瓦斯抽采混量和浓度分别提高43.1%和55.8%,保证了矿井安全生产和煤层气资源的有效利用。
中文关键词:低透气性  液态CO[sub_s]2[sub_e]相变  瓦斯抽采  卸压增透  有效影响半径  
 
Study on Fracturing and Enhanced Anti-penetration Enhanced Drainage of Liquid CO2
Abstract:In view of the low efficiency of high-gas and low-permeability coal seams, the CO2 phase change fracturing blasting anti-reflection technology was proposed to improve the extraction efficiency. The theoretical analysis and FLAC3D numerical model were used to study the effect of liquid CO2 phase change cracking and blasting on the coal seam and the field test was conducted. The results showed that: when the blasting parameters are CO2 blaster spacing 5m and blast hole spacing 7.5m, the porous continuous The blasting coal seam has the best effect of increasing the permeability; the law of coal body air permeability after blasting changes from the blast hole far and near is non-linear increase. After 18205 material lane implemented the liquid phase CO2 phase change cracking blasting technology, the permeability coefficient increased by 16.89~20.97 times, the average gas drainage volume and concentration increased by 43.1% and 55.8% respectively, which ensured the safe production of coal mines and coal seams. The effective use of gas resources.
keywords:low permeability  liquid CO2 phase transition  gas drainage  pressure relief  effective radius  
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