Research and Application of High-Energy Gas Fracturing Mechanism Based on CT Scanning Technology

Wei, Xiangrui; Wang, Xiang; Wu, Guangan; Liu, Quanwei; Zhang, Yansong

doi:10.1007/s00603-023-03487-w

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…The reservoirs are characterized by low porosity and low permeability, which makes it difficult to efficiently extract shale gas through conventional drilling techniques. , Therefore, it is imperative to modify shale reservoirs to increase shale gas production . Fracturing is an efficient way to modify shale reservoirs, and existing fracturing techniques include hydraulic fracturing, gas fracturing (supercritical CO 2 fracturing), liquid nitrogen fracturing, , foam fracturing, , blasting fracturing, high energy gas fracturing, , etc. The above fracturing techniques use static/dynamic impacts on shale reservoirs to create artificial fractures that communicate with existing natural fractures.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Nonlinear Gas Flow in Shale Anisotropic Fracture Under Effective Stress

Huang,

Zhai,

Liu

et al. 2024

Energy Fuels

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The anisotropy of surface roughness in shale fractures affects gas flow characteristics, which are crucial to evaluating shale gas production. However, the coupled relationship among surface roughness distribution, effective stress, and gas flow in a shale fracture has not been quantified sufficiently. This study numerically investigated the nonlinear gas flow in shale anisotropic fracture under varying effective stresses. The results show that the anisotropy of the roughness characteristics for shale fracture is characterized by autocorrelation function. The stress field distribution and flow characteristics on the fracture show distinct layering patterns: hourglass layering for stress, parallel layering for pressure, and elliptical layering for velocity. As shale gas transports from profile lines of x = 1 mm to x = 85 mm, the average pressure loss rate increment increases from 0.055% MPa −1 to 3.875% MPa −1 , demonstrating an enhanced effect of effective stress on the flow with increasing x value. Furthermore, in microscale shale fracture, flow velocity variation dominates in determining flow rate compared to fracture aperture variation during loading. Finally, as effective stress increases, fracture closure variation among different profile lines becomes increasingly significant, while relative differences in friction coefficient and Reynolds number among lines show a negative correlation with effective stress.

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