CH4-煤吸附/解吸过程视电阻率变化的实验研究

doi:10.13809/j.cnki.cn32-1825/te.2022.04.004

Abstract

Abstract:

In order to reveal the change law of apparent resistivity in the process of CH₄-coal adsorption/desorption of different macroscopic coal petrology compositions, the No.4 coal seam of the Jurassic Yan'an Formation in Dafosi coal mine is taken as the experimental object. By the proximate analysis and apparent resistivity measurement experiments of different coal samples （the durain, vitrain and mixed samples） with different water content （air dry basis sample, natural water absorption sample and samples dried at 378.15 K） of coal, the relationship between the apparent resistivity, methane adsorption and pressures is studied. The experimental results found that when compared to the vitrain, the durain has higher fixed carbon content, but lower ash content and moisture. The initial resistivity of the samples dried at 378.15 K of the durain is the largest. The influence of the adsorption of methane on the resistivity of the coal body is manifested in that with the adsorption of methane, the apparent resistivity of coal is significantly reduced. During the pressure increasing process that is the process of adsorption, the coal resistivity has a quadratic function relationship with the pressure and the amount of adsorption. The reason is that methane adsorption heat release, coal body expansion, and the spread of water on the inner wall of the pore throat causes the apparent resistivity to decrease. Due to methane adsorption, gas-water replacement occurs on the surface of the coal matrix, free water dissolves soluble minerals, and the ion concentration increases. In the process of adsorption, the apparent resistivity of coal decreases, but due to the limited soluble minerals and the hydrophobicity of coal, the resistivity of coal tends to be stable in the later stage of adsorption. During the depressurization process, that is the process of desorption, since the shrinkage of the coal matrix after expansion is irreversible （deformation）, the apparent resistivity of the coal body cannot be restored to its initial value. Compared to the durain, the pore connectivity of vitrain is poor, but the pore throat curvature is larger, when the number of charged particles in the double electric layer is high and aggregated in piles. This eventually leads to better electrical conductivity of vitrain than durain under the same conditions, i.e., the apparent resistivity of vitrain is smaller than that of durain.

Key words: Dafosi coal mine, apparent resistivity of coal, macroscopic coal petrology composition, adsorption/desorption, water content

CLC Number:

TE122

Liyan SHI,Weibo LI,Qinqin KANG, et al. Experimental study on variation of apparent resistivity in CH₄-coal adsorption/desorption process[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 572-579.

Figures/Tables 13

Fig. 1

Table 1

Fig. 2

Table 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Table 3

Fitting equations for the experimental results"

样品	升压吸附过程二次函数拟合	R²	降压解吸过程线性函数拟合	R²
A₁	$ρ = 197.6 p 2 - 900.2 p + 2 986.5$	0.829	$ρ = - 61.43 p + 1 999.4$	0.913
B₁	$ρ = 862.3 p 2 - 392.4 p + 1 972.3$	0.848	$ρ = - 14.14 p + 1 543.8$	0.997
C₁	$ρ = 865.6 p 2 - 4 165.4 p + 1 6521.2$	0.941	$ρ = - 129.2 p + 11 551.6$	0.235
A₂	$ρ = 150.9 p 2 - 925.3 p + 3 117.5$	0.963	$ρ = - 69.36 p + 1 831.9$	0.984
B₂	$ρ = 178.5 p 2 - 943.6 p + 2 471.2$	0.985	$ρ = - 16.33 p + 1 227.3$	0.353
C₂	$ρ = 221.89 p 2 - 1 168.39 p + 6 928.59$	0.962	$ρ = - 13.75 p + 5 381.2$	0.038
A₃	$ρ = 293.6 p 2 - 1 356.4 p + 3 188.5$	0.968	$ρ = - 100.8 p + 1 521.4$	0.932
B₃	$ρ = 132.6 p 2 - 856.7 p + 2 578.4$	0.996	$ρ = - 92.21 p + 1 403.8$	0.960
C₃	$ρ = 370.4 p 2 - 2 453.6 p + 8 437.2$	0.904	$ρ = - 40.98 p + 5 867.5$	0.656

Table 3

Fig. 10

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样品	M_ad	A_ad	V_daf	FC_ad
镜煤	1.38	3.29	26.89	68.44
暗煤	1.63	3.42	24.24	70.71

Experimental study on variation of apparent resistivity in CH₄-coal adsorption/desorption process

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类别及样品名称	暗煤柱样	镜煤柱样	混合柱样
空气干燥基样	A₁	A₂	A₃
自然吸水样	B₁	B₂	B₃
干燥样（通风干燥箱温度为378.15 K）	C₁	C₂	C₃

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Experimental study on variation of apparent resistivity in CH4-coal adsorption/desorption process

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Experimental study on variation of apparent resistivity in CH₄-coal adsorption/desorption process