镜煤和暗煤与甲烷界面作用实验研究——以民和盆地低阶煤为例

doi:10.13809/j.cnki.cn32-1825/te.2022.04.002

Abstract

Abstract:

In order to study the differences in the adsorption/desorption characteristics of methane between the gelification and fusinization in the bituminous coal, the 2# coal seam of the Haishiwan Coal Mine in Minhe Basin is collected as the research object. By using the Langmuir fitting and dual-site Langmuir fitting on the experimental data of isothermal adsorption/desorption respectively, the adsorption thermodynamic characteristics of different fugacity environments are analyzed by calculating the isosteric adsorption heat, and the influence of maceral difference on coalbed methane production is discussed. The results show that: ①The adsorption of methane on the gelification and fusinization in coal accords with the Langmuir function, and the fitting degree is higher than 0.99. The adsorption capacity of the gelification is much higher than that of the fusinization. ②At the same temperature point, there is desorption lag phenomenon in both granular coal and pillar coal, which is due to the difference of adsorption heat. The fitting results of granular coal experiment are larger than those of lump coal experiment. ③The equivalent adsorption heat increases with the increase of fugacity and decreases with the increase of temperature. The influence of adsorption phase density on the equivalent adsorption heat is greater than that of temperature, leading to the adsorption of methane molecules with greater kinetic energy on the coal surface. The equivalent adsorption heat decreases with the increase of temperature as a whole. ④The adsorption capacity of different components of coal is quite different, and areas with high vitrain content should be the first choice for CBM well location deployment.

Key words: gelification, fusinization, adsorption/desorption, isosteric adsorption heat, Haishiwan Coal Mine

CLC Number:

TE135

MA Dongmin,WANG Xin,TENG Jinxiang,JI Changjiang,SHAO Kai,ZHENG Chao,JI Yusong,HUI Peng. Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin[J].Petroleum Reservoir Evaluation and Development, 2022, 12(4): 556-563.

Figures/Tables 13

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References 23

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样品来源	水分M_ad	灰分A_ad	挥发分V_ad	固定碳FC_ad
海石湾2号煤层原煤	4.25	7.25	24.93	63.57
海石湾2号煤层镜煤	1.38	3.28	26.92	68.42
海石湾2号煤层暗煤	1.63	3.99	23.28	71.10

样品来源	镜质组	惰质组	壳质组	矿物质
海石湾2号煤层镜煤	78.3	18.0	1.9	1.8
海石湾2号煤层暗煤	13.3	74.6	7.3	4.8

温度（℃）	升压过程Langmuir拟合			降压过程解吸式拟合
温度（℃）	a	b	R²	a	b	c	R²
20	7.276	0.145	0.999	6.109	0.188	0.195	0.999
25	6.751	0.144	0.999	5.593	0.176	0.288	0.999
30	6.157	0.144	0.999	5.540	0.159	0.129	0.999
35	5.611	0.142	0.999	4.490	0.179	0.283	0.999
40	5.357	0.144	0.999	4.964	0.140	0.166	0.999
45	5.106	0.143	0.999	4.235	0.152	0.316	0.999

温度（℃）	升压过程双位Langmuir拟合					降压过程双位解吸式拟合
温度（℃）	a₁	b₁	a₂	b₂	R²	a₁	b₁	a₂	b₂	R²
20	7.284	0.143	0.015	0.735	0.999	6.076	0.203	0.092	-3.285	0.999
25	6.703	0.145	0.009	-0.082	0.999	5.588	0.178	0.267	-27.088	0.999
30	6.132	0.142	0.057	0.396	0.999	6.069	0.057	1.732	0.486	0.999
35	5.624	0.140	0.012	1.017	0.999	4.475	0.188	0.227	-10.099	0.999
40	5.198	0.147	0.578	-0.011	0.999	3.475	0.280	0.091	-0.127	0.999
45	4.993	0.138	0.152	0.284	0.999	4.601	0.102	0.632	2.535	0.999

温度（℃）	升压过程Langmuir拟合			降压过程解吸式拟合
温度（℃）	a	b	R²	a	b	c	R²
20	7.399	0.151	0.999	6.388	0.175	0.252	0.999
30	6.162	0.150	0.999	5.214	0.201	0.145	0.999
40	5.600	0.150	0.999	4.860	0.185	0.107	0.999

Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin

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