H2S水溶液对低阶煤渗透性的影响实验研究
Experimental study on effect of H2S aqueous solution on permeability of low-rank coal
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摘要: 为研究H2S水溶液对低阶煤渗透性的影响，选取准东煤田五彩湾煤矿（WCW）和吐哈煤田沙尔湖煤矿（SEH）的低阶煤样品，开展了H2S水溶液酸化前后平行层理方向和垂直层理方向煤样的孔隙度和渗透率测试、核磁共振测试及扫描电镜观测等对比实验。研究结果表明：H2S水溶液能够与孔、裂隙中的矿物发生溶蚀反应，导致酸化后煤的孔隙度增加、孔径分布变化及孔、裂隙连通性增强，且孔、裂隙中的煤粉和黏土矿物等物质能够通过裂隙随酸液运移出去，从而导致煤的渗透性得到改善；初始孔隙度越大，裂隙越发育，孔、裂隙连通性越好，渗透性越强的煤样H2S水溶液酸化后的扩容、增渗效果越明显。Abstract: In order to study the effect of H2S solution to the permeability of low-rank coal, we select low-rank coal sample from Wucaiwan Coal Mine（ＷＣＷ） of eastern Junggar Basin coalfield and Shaerhu Coal Mine（ＳＥＨ） of Tuha coalfield. The porosity and permeability at the parallel and vertical stratifications were compared before and after the acidizing experiments using various methods including the tests of porosity and permeability, Nuclear magnetic resonance（ＮＭＲ） and scanning electron microscopy （ＳＥＭ）. The results show that H2S solution can react with the minerals in pores and fractures, lead to the increase of porosity, the change of pore size distribution, the enhancement of connectivity between pores and fractures. At the same time, some materials such as coal powder and clay minerals transport out through fractures with H2S solution, resulting in improving the permeability of coal. The larger initial porosity, the more fractures developed, the better connectivity between pore and fracture, and the better permeability, the effective of H2S solution to expansion and permeability is more obvious after acidification.
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