Study on explosion overpressure and deflagration-to-detonation transition characteristics of shale gas in fractures

doi:10.16265/j.cnki.issn1003-3033.2025.04.1040

Abstract

Abstract:

To investigate the methane DDT distance and maximum explosion pressure (P_max) in shale fractures, a multi-scale adjustable 3D planar slit detonation system was developed. Experiments with methane-oxygen premixed gas under 4 different hydraulic diameters, along with numerical simulations, were conducted to examine shale gas combustion under high pressure. Results show that methane-oxygen premixed gas can sustain self-propagating explosion within a hydraulic diameter range of 1.9 to 11.43 mm. Both P_max and peak pressure rise rate increase linearly with initial pressure. Under a hydraulic diameter of 11.43 mm, P_max closely approaches theoretical detonation pressure. As the hydraulic diameter decreases, the P_max-to-initial pressure ratio decreases. The initial pressure and the DDT distance follow a power-law relationship. Increasing the initial pressure or reducing the hydraulic diameter can shorten the DDT distance, thereby accelerating the DDT. The simulation shows that methane-oxygen premixed gas explosions can produce an overpressure of 330 MPa, capable of fully fracturing rock cracks.

Key words: shale gas, methane, fractures, explosion, deflagration-to-detonation transition (DDT)

CLC Number:

X932爆炸安全与防火、防爆

SHAO Hao, CAI Yi, YANG Tao, WU Zhengyan, HU Huan, YAO Zhiyuan. Study on explosion overpressure and deflagration-to-detonation transition characteristics of shale gas in fractures[J]. China Safety Science Journal, 2025, 35(4): 51-58.

Figures/Tables 14

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Table 2

Simulation results of explosion characteristics under different P0

P₀/ MPa	爆轰压力/ MPa	爆轰温度/ K	DDT 距离/ mm	$d P d t$ / (MPa·s^-1)	爆轰波传播速度/ (m·s^-1)
0.1	3.08	4 160	440	7 700	2 145
1.0	31	4 220	263	77 500	2 256
5.0	160.5	4 500	140	401 250	2 468
10.0	330	4 623	110	828 960	2 500

Table 2

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