功率超声促进煤体解吸增渗试验研究

发布时间：2018-05-13 23:18

本文选题：功率超声 + 颗粒煤岩　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：煤储层的渗透率是煤层气开采过程中的一个重要指标。要提高煤层气的开采量就必须致力于打开抑制煤层气运移的通道。而打开通道的关键在于裂纹、裂隙的贯穿及网络化。特别地,对目前超声增渗机理相关方面仍需进行必要的理论研究及相关的试验研究。本文通过相关试验对超声作用过程中原煤及颗粒煤岩(“型煤”)的裂纹形成、扩展及贯穿问题进行了深入的研究。研究结果表明：对于颗粒煤岩体系的多层次,多尺度,非连续性问题可以通过随机统计理论转化为连续介质问题来解决；超声机械效应可以有效促进裂纹尖端应力集中,裂纹的扩展及贯穿；超声热效应产生的热量以热传导方式通过(颗粒)煤岩体,促使气体分子摆脱内壁的吸附,提高了气体解吸量；超声作用引起的损伤有助于提高低渗煤岩体的渗透性能。
[Abstract]:The permeability of coal reservoir is an important index in the process of coal bed methane production. In order to increase the extraction rate of CBM, it is necessary to open the channel to restrain the migration of CBM. The key to open the channel lies in the crack, crack penetration and networking. In particular, necessary theoretical and experimental studies are needed on the relevant aspects of ultrasonic infiltration mechanism. In this paper, the crack formation, propagation and penetration of raw coal and granular coal ("briquette") in ultrasonic process are studied. The results show that the problem of discontinuity can be solved by the stochastic statistical theory and the ultrasonic mechanical effect can effectively promote the stress concentration at the crack tip for the multi-level and multi-scale of granular coal and rock system. The heat produced by ultrasonic thermal effect passes through coal and rock mass by means of heat conduction, which makes gas molecules get rid of the adsorption of inner wall and increase the amount of gas desorption. The damage caused by ultrasonic is helpful to improve the permeability of low permeability coal and rock mass.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37;TD31

【相似文献】