Experimental study of permeability change of organic-rich gas shales under high effective stress

Chen, Tianyu; Feng, Xia‐Ting; Cui, Guanglei; Tan, Yunliang; Pan, Zhejun

doi:10.1016/j.jngse.2019.01.014

Cited by 111 publications

(39 citation statements)

References 30 publications

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“…As shown in Figure 11, continuous borehole video is obtained by passing a borehole camera through the borehole and conversion of the video data in the acquisition instrument. Two important indexes are used to assess the evolution of cracking in the surrounding rock [22,23]: (1) the depth of the maximum cracking area and (2) the degree of cracking in this area. In the surrounding rock mass, fractures develop in many areas over time.…”

Section: Internal Cracking Process Of Surrounding Rocksmentioning

confidence: 99%

Three‐Dimensional, Real‐Time, and Intelligent Data Acquisition of Large Deformation in Deep Tunnels

Zhao

Han

Kou

et al. 2021

Advances in Civil Engineering

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Potential disasters of large deformation pose serious threats to deep underground projects such as tunnels and mines. Engineering with large deformation is typically characterized by high stress, complex engineering geology, strong disturbance, and squeezing deformation, posing a great challenge to the design of an effective and accurate monitoring system. To address this problem, it is necessary to grasp the three-dimensional features of deformation and establish integrated monitoring of a support system. Monitoring equipment should be selected to obtain joint, stress, deformation, cracking process, and other information, and this information can be fed back to the warning and control module. The scheme of the monitoring system presented here was successfully applied to a deep metal mine. This intelligent monitoring system ensures safety during the construction and operation of the tunnel under complex surrounding rock conditions, allows the use of field monitoring data to guide construction and design, and provides a reference for future construction and project monitoring.

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Section: Internal Cracking Process Of Surrounding Rocksmentioning

confidence: 99%

Three‐Dimensional, Real‐Time, and Intelligent Data Acquisition of Large Deformation in Deep Tunnels

Zhao

Han

Kou

et al. 2021

Advances in Civil Engineering

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“…Loading and unloading cycles have a significant impact on the permeability hysteresis of the samples [35,43], and the hysteresis effect is more significant under triaxial stress conditions than that under true-triaxial stress [44]. e size effect is an important factor to be analyzed, and in general, larger sizes have greater hysteresis [45].…”

Section: Influence Of Sand Concentration On Hysteresismentioning

confidence: 99%

Permeability Characteristics of Water‐Sand Seepage in Fracture by Experiment

Liu

et al. 2021

Advances in Civil Engineering

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Studies on the seepage characteristics of water-sand cracks are of great significance to reveal the mechanisms of water and sand inrush. Using a self-made water-sand fracture seepage test instrument, a water-sand seepage test was carried out, and the permeability of water and sand in the fracture was determined. The hysteresis characteristics of water-sand flow in the fracture were obtained after the required permeability was attained. The results show that the hysteresis curve changes from type I to type IV with the increase in sand particle size and concentration. The hysteresis parameters are described by the maximum hysteresis Gp ∗ and the hysteresis area S, both of which show an increasing trend with the increase in sand particle size and concentration; however, this increase is not synchronous. The average velocity and turbulent kinetic energy distribution of the water-sand fluid on the fracture cross section are greatly affected by the particle size and concentration of the volume of sand. This study can provide a reference for further study of water inrush from a shallow coal seam. Through simulation, it is found that the particle size has a great influence on the seepage velocity, and the influence near the side wall surface is greater than that in the middle position.

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“…As an efficient clean resource, unconventional gas, such as shale gas and coal bed methane, is of great significance to the sustainable development of economy and energy [1][2][3][4][5]. However, the permeability of unconventional gas reservoirs is usually extremely low, greatly prohibiting the efficient extraction of gas.…”

Section: Introductionmentioning

confidence: 99%

A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing

2020

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High-energy gas fracturing (HEGF) and gas fracturing (GF) are considered to be efficient to enhance the permeability of unconventional gas reservoir. The existing models for HEGF mainly focus on the dynamic loading of stress wave or static loading of gas pressurization, rather than on the combined actions of them. Studies on the combination of HEGF and GF (HEGF+GF) are also few. In this paper, a damage-based stress wave propagation-static mechanical equilibrium-gas flow coupling model is established. Numerical model and determination of mesomechanical parameters in finite element analysis are described in detail. Numerical simulations on crack evolution under HEGF, GF, and HEGF+GF are carried out, and the impact of in situ stress conditions on crack evolution is discussed further. A total of 11 cracks with length of 2.3-4 m in HEGF, 4 main cracks with length of 6.5–8 m in GF, and 11 radial cracks with length of 2–11.5 m in HEGF+GF are produced. Many radial cracks around the borehole are formed in HEGF and extended further in GF. The crustal stress difference is disadvantageous for crack complexity. This study can provide a reference for the application of HEGF+GF in unconventional gas reservoirs.

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Experimental study of permeability change of organic-rich gas shales under high effective stress

Cited by 111 publications

References 30 publications

Three‐Dimensional, Real‐Time, and Intelligent Data Acquisition of Large Deformation in Deep Tunnels

Three‐Dimensional, Real‐Time, and Intelligent Data Acquisition of Large Deformation in Deep Tunnels

Permeability Characteristics of Water‐Sand Seepage in Fracture by Experiment

A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing

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