基于核磁共振的Fenton改性煤样孔隙特征实验研究

Experimental Study on Pore Characteristics of Fenton Modified Coal Samples Based on Nuclear Magnetic Resonance

为了研究Fenton试剂改性后煤样孔隙特征的变化规律以及对煤岩渗透性的影响,基于低场核磁共振实验得到了不同煤级煤样经Fenton试剂改性前后煤样的T2弛豫时间谱,根据T2弛豫时间谱分析了Fenton改性煤岩孔隙特征的变化规律,结合实验煤样的渗透率测定实验,分析了Fenton试剂改性作用对煤样的扩孔和增透作用机理。研究结果表明:不同煤级的煤样经Fenton试剂处理后,煤样的微小孔隙发育扩展,微小孔隙与中大孔隙之间相互贯通形成大尺寸孔隙,甚至形成宏观小裂纹,增加了煤样的透气性,并使改性后煤样的渗透率明显增大。

In order to study the variation of pore characteristics of coal samples after modification with Fenton reagent and the influence on the permeability of coal, the T2 relaxation time of different coal samples before and after modification with different Fenton reagent was obtained based on low field nuclear magnetic resonance(NMR) experiments, according to the T2 relaxation time spectrum, the variation of pore characteristics of Fenton modified coal rock was analyzed. Combined with the experiment of permeability measurement of coal samples, the mechanism of reaming and augmenting of coal samples by Fenton reagent modification was analyzed. The results show that the coal samples of different coal grades are treated with Fenton reagent, the micropores of coal samples develop and expand, the micropores and the macropores are interpenetrated with each other to form large-size pores, and even macroscopic small cracks are formed, and the permeability of the modified coal sample was significantly increased.