低渗煤层气注热开采渗透规律研究
Study on Seepage Laws in Coal Bed Methane Mining Through Injecting Thermal in Low Permeability Coal Seam
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摘要: 为分析低渗高储煤层注热开采时的渗透规律，通过实验室试验分析得出了山西许村煤矿3号煤在温度作用下渗透率发生巨变的渗透率临界阈值温度为350 ℃；通过理论分析得出了低渗储层注热开采的热-流-固数学模型，并基于该模型对热-流-固耦合作用下低渗储层注热开采的渗透规律进行了数值模拟研究，研究结果表明：随着注热时间的增加，储层渗透率也在不断的增大，当注热时间达到5 h时，储层渗透率较原始渗透率增加14倍左右，注热效果明显，5 h之后，注热对于储层渗透率的变化影响不大。Abstract: In order to research seepage laws in low permeability and high storage coal seam through injecting heat, through laboratory tests, it was concluded that critical threshold temperature was 350 ℃ when the permeability of 3# coal seam of Shanxi Xucun Coal Mine happened great changes under temperature effect; thermal-fluid-solid mathematical model of injecting heat in low permeability coal seam is concluded through the theoretical analysis; based on this model, numerical simulation is used to study seepage regulation of low permeability and high storage coal seam through injecting heat under the action of heat-fluid-solid coupling. The results show that with the increase of injection time, coal seam permeability is increasing, when the injection time is 5 h, the coal seam permeability increases about 14 times than the original permeability, thermal effect is obvious, and thermal injection has little effect on change of coal seam permeability after 5 h.
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