水-热耦合作用下含瓦斯柱状原煤渗吸效应的实验研究
Experimental study on imbibition effect of columnar raw coal containing gas under water-thermal coupling action
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摘要: 为了考察水-热耦合作用下水分沿煤体原始裂隙、孔隙渗吸置换吸附瓦斯的特性，开展了50 mm×100 mm柱状原煤以0.5、1.0、2.0、3.0 MPa瓦斯初始平衡压力，在20、40、60、80 ℃下的240 h渗吸实验。实验表明：高温可显著提高水分渗吸置换甲烷效率，0.5 MPa初始低压下，80 ℃较20 ℃的渗吸置换率（240 h）可提高1.6倍，增大至57.21%；同压下置换率（240 h）及渗吸常数均随着实验温度的升高而增大，同温下置换率（240 h）及渗吸常数则随着初始压力的增大而减小，同温下低压渗吸置换效率高于高压，高压会抑制渗吸置换效应；低压-高温环境下水分渗吸置换效率更高，不宜直接在高压储层中进行注热（水），应在抽采至出现低压瓦斯驱动力不足时，再注热（水）可进一步提高瓦斯采出率。Abstract: In order to investigate the characteristics of water displacement and adsorption of gas along the original cracks and pores of coal under the action of water-thermal coupling, imbibition experiments of 50 mm×100 mm columnar raw coal were carried out for 240 h at 20 ℃, 40 ℃, 60 ℃ and 80 ℃ under the initial equilibrium gas pressure of 0.5 MPa, 1.0 MPa, 2.0 MPa and 3.0 MPa. Experiments show that: high temperature can significantly improve the efficiency of water imbibition replacement for methane. Under the initial low pressure of 0.5 MPa, the imbibition replacement rate（240 ｈ） at 80 ℃ is 1.6 times higher than that at 20 ℃, increasing to 57.21%; the displacement rate（240 ｈ） and imbibition constant at the same pressure increased with the increase of the experimental temperature, while the displacement rate（240 ｈ） and imbibition constant at the same temperature decreased with the increase of the initial pressure; the imbibition displacement efficiency at low pressure was higher than that at high pressure at the same temperature, and high pressure would inhibit the imbibition displacement effect; the water imbibition displacement efficiency is higher in the low-temperature environment, so it is not suitable to directly inject heat（ｗａｔｅｒ） in thehigh-pressure reservoir; the gas recovery rate should be further improved by reinjecting heat（ｗａｔｅｒ） when the driving force of low-pressure gas is insufficient.
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Keywords:
- heat injection /
- imbibition effect /
- columnar raw coal /
- imbibition constant /
- replace rate /
- recovery rate
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