Research on the pressure variation law and enhancing CBM extraction application effect of CO2 phase transition jet coal seam fracturing technology

doi:10.1007/s11707-022-1078-y

Frontiers of Earth Science

2023, Vol. 17

Issue (3): 867-883 https://doi.org/10.1007/s11707-022-1078-y

本期目录

Research on the pressure variation law and enhancing CBM extraction application effect of CO₂ phase transition jet coal seam fracturing technology

Xin BAI^1,^2,³(

), Zhuoli ZHOU¹, Guicheng HE¹(

), Dongming ZHANG⁴, Han YANG⁴, Zenrui FAN⁵, Dengke WANG²

¹. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
². State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China
³. Key Laboratory of Safety and High-efficiency Coal Mining (Ministry of Education), Anhui University of Science and Technology, Huainan 232001, China
⁴. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
⁵. China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China

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Abstract：

Due to the limited permeability and high methane content of the majority of China’s coal seams, significant coal mining gas disasters frequently occur. There is an urgent need to artificially improve the permeability of coalbed methane (CBM) reservoirs, enhance the recovery efficiency of CBM and prevent mine gas accidents. As a novel coal rock fracture technology, the CO₂ phase transition jet (CPTJ) has been widely used due to its advantages of safety and high fragmentation efficiency. In this study, to ascertain the effects of the pressure of CPTJ fracturing, the influence of its jet pressure on cracked coal rock was revealed, and its effect on CBM extraction was clarified. In this research, the law of CPTJ pressure decay with time was investigated using experimental and theoretical methods. Based on the results, the displacement and discrete fracture network law of CPTJ fracturing coal rock under different jet pressure conditions were studied using particle flow code numerical simulation. Finally, field experiments were conducted at the Shamushu coal mine to assess the efficiency of CPTJ in enhancing CBM drainage. The results showed that the pressure of the CPTJ decreased exponentially with time and significantly influenced the number and expansion size of cracks that broke coal rock but not their direction of development. CPTJ technology can effectively increase the number of connected microscopic pores and fractures in CBM reservoirs, strongly increase the CBM drainage flow rate by between 5.2 and 9.8 times, and significantly reduce the CBM drainage decay coefficient by between 73.58% and 88.24%.

Key words： coalbed methane (CBM) CO₂ phase transition jet pressure evolution damage of coal CBM drainage

收稿日期: 2022-09-03 出版日期: 2023-12-12

Corresponding Author(s): Xin BAI,Guicheng HE

引用本文:

. [J]. Frontiers of Earth Science, 2023, 17(3): 867-883.
Xin BAI, Zhuoli ZHOU, Guicheng HE, Dongming ZHANG, Han YANG, Zenrui FAN, Dengke WANG. Research on the pressure variation law and enhancing CBM extraction application effect of CO₂ phase transition jet coal seam fracturing technology. Front. Earth Sci., 2023, 17(3): 867-883.

链接本文:

https://academic.hep.com.cn/fesci/CN/10.1007/s11707-022-1078-y
https://academic.hep.com.cn/fesci/CN/Y2023/V17/I3/867

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Parameters	Values	Parameters	Values
Particle diameter ratio	1.1	Cohesion strength of parallel-bond, (Pa)	13e⁶
Particle density, ρ (kg/m³)	2500	Friction angle of parallel-bond, (° )	21
Normal critical damping ratio	0.5	Parallel bond radius multiplier, λ	0.8
Stiffness ratio, K_n/K_s	1.3	Contact modulus of particle, E_c (GPa)	1.4
Particle stiffness ratio	1.3	Effective modulus of the parallel bond, $E ¯ c$ (GPa)	1.4
Particle friction coefficient, u	0.3	Ratio of normal to shear stiffness of the parallel bond, $k ¯ n / k ¯ s$	1.3

Tab.1

Fig.6

Sample	Industrial analysis ( $M a x i m u m v a l u e − M i n i m u m v a l u e A v e r a g e v a l u e (N u m b e r o f s a m p l e s)$ )				Coal rank
Sample	Moisture/%	Ash/%	Volatile matter/%	Fixed carbon/%	Coal rank
#1	0.34	26.67	18.71	54.28	High metamorphic anthracite
#2	0.35	26.50	18.81	53.96	High metamorphic anthracite

Tab.2

Fig.7

Fig.8

Initial pressure P₀/MPa	Fitted curve equation	Fitting parameter m	R²
10	$P (t) = P 0 e − m t$	0.215	0.96
20		0.294	0.92
30		0.376	0.88
40		0.400	0.91
50		0.408	0.93

Tab.3

Fig.9

Fig.10

Fig.11

Tab.4

Fig.12

Fig.13

Fig.14

Tab.5

Initial pressure P₀/MPa	Theoretical equations	Experimental fitting equations	Deviation rate/%
10	$p = 10 e − 0.206 t$	$p = 10 e − 0.215 t$	4.23
20	$p = 20 e − 0.287 t$	$p = 20 e − 0.294 t$	2.41
30	$p = 30 e − 0.343 t$	$p = 30 e − 0.376 t$	8.82
40	$p = 40 e − 0.366 t$	$p = 40 e − 0.400 t$	8.58
50	$p = 50 e − 0.424 t$	$p = 50 e − 0.408 t$	4.03

Tab.6

Fig.15

Fig.16

Tab.7

Fig.17

Fig.18

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