抽采长度对煤层气开采效果的影响分析

doi:10.13722/j.cnki.jrme.2015.1655

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Abstract The physical simulation about the coal-bed methane(CBM) exploitation under 3D stress state was conducted with a multi-field coupling test system developed in-house. The development of gas pressure under the different borehole lengths was analyzed. The results show that the gas pressure decreases rapidly near the center of the borehole under the different borehole lengths. The rate of pressure drop is high at the beginning and then decreases gradually. With the increase of the borehole length，the area with high pressure gradient increases significantly，which leads to the rise of gas desorption rate and productivity. On the cross sectional plane of borehole，the pressure contours are ring shaped with the center located at the borehole，indicating that the gas flows from the coal to the borehole. On the horizontal plane，the pressure contours present the funnel shaped distribution around the symmetry axis of the borehole. Although the length of the borehole has limited influence on the occurrence time of the danger elimination area of gas outburst，the time needed to prevent the gas outburst is greatly reduced with the increase of the borehole length. Because of the high stress and the low rate of gas desorption in the coal seam area of stress concentration，more time is needed for the gas production to eliminate the outburst danger than in the other areas.

Key words： mining engineering coal-bed methane exploitation multi-field coupling physical simulation borehole length gas pressure

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	Articles by authors
	MA Bo1
	2
	3
	XU Jiang1
	2
	3
	LIU Longrong1
	2
	3
	MING Jinke3
	YUAN Jing3
	SU Xiaopeng1
	2
	3

Cite this article:

MA Bo1,2,3, et al. Analysis of the effect of the borehole length on the efficiency of coal-bed#br# methane exploitation[J]. , 2017, 36(1): 175-185.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1655 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I1/175

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