脉动水锤增透技术对煤体有效孔隙率影响实验研究

Experimental Research of the Impact of Enhanced Permeability Technology by Pulsation Water-hammer on Effective Porosity of Coal Body

煤体的有效孔隙率与煤层的增透效果密切相关。针对这一特性,以透气性较差的难注水煤层为研究对象,研究脉动水锤增透技术在不同注水压力下对煤体有效孔隙率的影响。实验表明:采用常规静压注水时,煤体有效孔隙率数值较低,随注水压力的升高,其增长幅度较小;采用脉动水锤增透技术后,在较低的注水压力时,煤体就具有较高的有效孔隙率,增透效果明显,且在整个注水过程中,煤体能够保持很高的有效孔隙率。

The effective porosity of coal body is closely related to coal seam enhanced permeability effect. According to this feature, it takes difficult water injection of poorer coal seam permeability as the research object, and studies the impact of pulsation water hammer enhanced permeability technology on the effective porosity of coal under different water injection pressure. The test shows that when it uses the conventional static pressure water injection, effective porosity value of coal is low, with the increase of injection pressure, its growth rate is smaller. After using pulsation water hammer enhanced permeability technology, coal has high effective porosity in the lower water injection pressure, enhanced permeability effect is obvious, and in the whole process of water injection, coal can keep high effective porosity.