CO2相态变化致裂对煤层吸附性影响机理研究

doi:10.13809/j.cnki.cn32-1825/te.2024.06.019

Abstract

Abstract:

Liquid CO₂ phase transition fracturing（LCPTF） technology is a novel water-free fracturing technique that can enhance coalbed methane recovery. To study the changes in coal adsorption characteristics before and after CO₂ phase transition fracturing, the No. 3 coal seam from the Yuwu coal mine was selected for experimentation. High-pressure mercury intrusion, low-temperature liquid nitrogen adsorption experiments, and CH₄ isothermal adsorption tests were conducted to analyze the impact of liquid CO₂ phase transition fracturing on coal adsorption. The results showed that after liquid CO₂ phase transition fracturing, the pore volume and specific surface area of adsorption pores in coal decreased; the specific surface area of seepage pores decreased while the pore volume of seepage pores increased. The liquid CO₂ phase transition fracturing technique could influence the change in the Langmuir adsorption constant of coal by altering the pore structure. After liquid CO₂ phase transition fracturing, the Langmuir adsorption constant “a” value decreased and the “b” value increased, indicating that the fracturing process reduced the coal’s adsorption capacity and enhanced the desorption rate. This study provides theoretical guidance for the improvement and optimization of liquid CO₂ phase transition fracturing technology for field applications.

Key words: coalbed methane, adsorption, pore structure of coal, liquid CO₂ phase transition fracturing, free gas

CLC Number:

TE372

WANG Zhijian. Mechanism study on effect of CO₂ phase transition fracturing on methane adsorption in coal[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 967-974.

Figures/Tables 13

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References 22

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煤样	工业分析/%			R_max/%
煤样	M_ad	A_ad	V_daf	R_max/%
原煤	0.89	13.19	11.20	2.20

样品	a/(cm³/g)	a均值/(cm³/g)	a均值的变化率/%	b/(MPa^-1)	b均值/(MPa^-1)	b均值的变化率/%
YW-R1	24.062 8	24.622 35	-25.45	0.828 6	0.839 5	43.24
YW-R2	25.181 9	24.622 35		0.850 4	0.839 5
YW-F1	18.908 5	18.354 95		1.133 9	1.202 5
YW-F2	17.801 4	18.354 95		1.271 1	1.202 5

样品	渗流孔孔容/(cm³/g)	渗流孔孔比表面积/（m²/g）
YW-R1	0.050 7	0.048 4
YW-R2	0.046 9	0.043 5
YW-F1	0.061 8	0.027 3
YW-F2	0.058 1	0.021 4

样品	孔容/(cm³/g)	孔比表面积/（m²/g）	平均孔径/nm
YW-R1	0.000 915	0.483 97	14.78
YW-R2	0.000 883	0.572 76	15.12
YW-F1	0.000 600	0.216 40	16.46
YW-F2	0.000 593	0.321 12	16.88

Mechanism study on effect of CO₂ phase transition fracturing on methane adsorption in coal

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Mechanism study on effect of CO2 phase transition fracturing on methane adsorption in coal

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Mechanism study on effect of CO₂ phase transition fracturing on methane adsorption in coal