注水压力对煤孔径影响试验研究
许圣东，左钦
（中煤科工集团重庆研究院有限公司，重庆 400039）
摘要： 为研究煤层注水过程中煤体孔隙结构的演化规律，采用低场核磁共振仪测试煤样在不同注水压力下的孔径分
布特征。试验结果表明，t2谱表现出“三峰”的特征，以小孔居多，中孔和大孔较少；随着水压的增大，煤样孔隙度增
大，当水压达到8 MPa 时，孔隙间的渗流通道有效连通。
关键词： 煤层注水；注水压力；孔径分布；核磁共振
中图分类号： TD714     文献标志码： A     文章编号： 2095-0802-(2022)07-0054-03
Experimental Research on Effect of Water Injection Pressure on Coal Pore Size
XU Shengdong, ZUO Qin
(Chongqing Research Institute Co., Ltd., China Coal Technology Engineering Group, Chongqing 400039, China)
Abstract: In order to study the evolution law of coal pore structure in the process of coal seam water injection, a low-field
nuclear magnetic resonance apparatus was used to test the pore size distribution characteristics of coal samples under different
water injection pressures. The test results showed that t2 relaxation spectrum presented the characteristics of "three peaks", with
more small pores and less medium and large pores; with the increase of water pressure, the porosity of coal samples increased, and
when the water pressure reached 8 MPa, the seepage channels between the pores were effectively connected.

Key words: coal seam water injection; water injection pressure; pore size distribution; nuclear magnetic resonance