煤层气–水微尺度段塞流动规律相似试验研究

doi:10.13722/j.cnki.jrme.2021.1069

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Abstract Coalbed gas-water slug flow is an important factor limiting coalbed methane production，but there have been relatively few studies on the patterns of two-phase slug flow in microscale channels. In this study，an independently developed microfluid injection-microscopic observation-microscale modeling system was used to conduct gas-water slug flow experiments under different humidity and fluid velocity conditions. Slug flow patterns were determined using the pressure data and the gas-liquid interaction captured by high-speed cameras. The pressure distribution of three-dimensional slug units was analyzed using the phase-field method. The results shows：(1) “Step pressure” on the gas-liquid interface of slug flow leads to a significant decrease in gas flow capacity. Equal flow injection reduces the gas conductivity by about three orders of magnitude in comparison with single-phase flow. (2) In two-phase slug flow，the apparent length of the gas phase decreases exponentially as the water saturation increases，as does the relative permeability of the gas phase. (3) The additional pressure drop caused by the gas lock is the main restrictor of slug flow，and the pressure drop decreases as the hydrophilicity increases. The gas permeability is more sensitive to changes in wettability at low water saturation. High liquid velocity produces greater inertial force，which makes the relative permeability of the gas phase less sensitive to changes in water saturation. This study reveals the patterns of gas-water two-phase slug flow in microscale channels，and provides a theoretical basis for suppressing the occurrence of slug flow and promoting the efficient production of coalbed methane.

Key words： mining engineering coalbed methane microscale slug flow additional capillary force conductivity capacity

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	CHEN Shaojie1
	ZHANG Jicheng1
	ZAKI M M1
	2
	YIN Dawei1
	WANG Sheng1
	SHENG Shouqian1
	KHORESHOK A A3

Cite this article:

CHEN Shaojie1,ZHANG Jicheng1,ZAKI M M1, et al. Similarity experimental study on the law of CBM-water microscale slug flow [J]. , 2022, 41(7): 1338-1346.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1069 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1338

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