低透气性松软煤层增透技术研究现状及高能气体压裂新技术

Present situation of research on permeability enhancement technology of low permeability soft coal seam and new technology of high-energy gas fracturing

为解决低透气性松软煤层难抽采的问题,我国煤炭行业科技工作者做了大量的工作。采用文献综述的方法,对我国目前采用的水力增透技术、深孔爆破增透技术、CO_2预裂增透技术、大孔径及密集交叉钻孔卸压、液氮半溶浸煤致裂增透技术等物理增透技术和ClO_2溶蚀煤增透法、Feton试剂增透法、多组分酸溶浸煤增透法、微生物等生化法对煤的改性作用进行了评述,指出了上述方法的特点,并提出将高能气体压裂技术应用于我国煤矿。借助LS-DYNA数值分析软件,揭示了高能气体压裂技术压裂煤层的应力变化及裂隙扩展方向。

In order to solve the problem of difficulty in evacuation of low gas permeability soft coal seams, a lot of work had been done by scientific and technical workers in the coal industry of China. This article adopted the method of literature review to comment the hydraulically enhanced technology, deep-hole blasting enhanced technology, CO2 enhanced technology, large-aperture hole and dense cross-boring pressure relief, liquid nitrogen senti-soluble cracking enhanced technology and other physical enhanced technology used in China,and ClO2 anti-corrosion enhanced method, Feton reagent enhanced method, multi-component acid-refined coal soaking method, nfierobial and other bioehenfieal methods on the modification of coal. The high-energy gas fracturing technology was proposed to apply to coal nfines in China by analyzing the characteristics of the above method. The stress changes and fracture propagation direction of fractured coal seams in high-energy gas fracturing technology were revealed by the LS-DYNA numerical analysis software.