水驱气中驱动液侵入对瓦斯解吸的影响

针对水驱气的实施时间和驱动液的选择问题,利用外液侵入条件下含瓦斯煤的瓦斯解吸实验装置,开展了纯水和质量分数为0.025%JFC渗透剂溶液侵入过程中和侵入后对瓦斯解吸影响实验研究。结果表明:在煤层高压注液过程中对瓦斯的解吸和运移具有促进作用,且促进作用的表现程度与液体的性质有关,而在注液之后则对瓦斯解吸与释放具有延缓与阻碍作用。为了充分利用上述两种作用,在水驱气的实施时间上宜选在抽采末期,而在驱动液的选择上则宜在纯水中添加一定量的渗透剂,变"水驱气"为"液驱气"。在抽采钻孔利用上,注液孔与抽采孔宜分开使用。该研究可以为水驱气的利用提供参考。

Experiment of drive liquid invasion impact on gas desorption about water drive gas

Aimed at implementation time of water drive gas and the selection of drive liquid,this paper describes the experimental study of the impact on gas desorption by the invasion of pure water and the concentration of 0.025% penetrant agent solution,using gas desorption experiment device of gas-bearing coal under the condition of external solution invasion.The results show that the high pressure liquid performs the function of promoting gas desorption and migration during invasion to the performance degree as determined by the nature of liquid which could delay and block gas desorption and release after invasion.The efforts to make fuller use of the two kinds of function necessitate the application of the implementation time of water drive gas to gas extraction’s later stage and addition of certain amount of penetrant to pure water to change"water drive gas"into"liquid drive gas",coupled with separately using the drilling of injection liquid and the drilling of gas extraction during the use of extraction drilling.The study promises as reference for using water drive gas.