高压气水交变驱替置换瓦斯实验研究  

Experimental study on gas displacement by high-pressure gas-water alternating displacement

作　　者：高永文 李宏伦 朱传杰[2] 吴奇 刘思远 Gao Yongwen;Li Honglun;Zhu Chuanjie;Wu Qi;Liu Siyuan(Guizhou Qianxi Energy Administration,Qianxi 551500,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]贵州黔西市能源局,贵州黔西551500 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《能源与环保》2025年第2期16-24,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金资助项目(52174211);国家科技重大专项(2020YFA0711803);国家自然科学基金重点项目(52334007)。

摘　　要：由于瓦斯绝大部分赋存于煤基质孔隙结构中,为了改善我国低渗透煤层的瓦斯抽采效果,自主设计搭建了高压气—水混压驱替瓦斯实验系统,并验证了不同工况条件下高压气水交变技术对驱替瓦斯的作用效果。结果表明,变质程度越高时煤疏水性越强;驱出的瓦斯含量随注水压力增加表现为先增后减,优化注水压力的区间范围有助于改善驱替效率,这是由于流体压力破坏了裂隙结构导致多相流流体通道重新分布。在注水结束后注入不同压力空气来驱替主裂隙中残余的含瓦斯水,出口出现流量阶梯式突破的现象。注入气体未突破时,瓦斯流量较注水略微提升;待注入气体突破后,出口流量迅速增加。随着气—水压差的增加,会减少突破时间、气体的有效驱替范围和完全置换瓦斯时间,进而减弱了驱替效率。Since most of the gas exists in the pore structure of coal matrix,in order to improve the gas extraction effect of low permeability coal seam in China,a high-pressure gas-water mixed pressure gas displacement experiment system was independently designed and built,and the effect of high-pressure gas-water alternating technology on gas displacement under different working conditions was verified.The results show that the higher the degree of metamorphism,the stronger the hydrophobicity of coal;with the increase of water injection pressure,the gas content expelled increases first and then decreases.Optimizing the range of water injection pressure is helpful to improve the displacement efficiency,because the fluid pressure destroys the fracture structure and leads to the redistribution of multiphase flow channels.After the water injection is completed,injecting air of different pressures to replace the residual gas containing water in the main fracture results in a stepped breakthrough of flow rate at the outlet.When the injected gas does not break through,the gas flow is slightly higher than that of water injection.After the injected gas breakthrough,the outlet flow rate increases rapidly.With the increase of gas-water pressure difference,the breakthrough time,the effective displacement range of gas and the complete displacement time of gas will be reduced,and the displacement efficiency will be weakened.

关 键 词：高压气水交变 驱替瓦斯 注水压力 注气压差 瓦斯抽采 

分 类 号：TD712.6[矿业工程—矿井通风与安全]