Feng Gao

China University of Mining and Technology

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Yang Ju

China University of Mining and Technology

Chengzheng Cai

China University of Mining and Technology

Peng Hou

Lanzhou University of Technology

Yi Xue

Xi'an University of Architecture and Technology

Yanan Gao

China University of Mining and Technology

Yugui Yang

China University of Mining and Technology

Jianguo Wang

China University of Mining and Technology

Zhizhen Zhang

China University of Mining and Technology

Heping Xie

Sichuan University

Guannan Liu

China University of Mining and Technology

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China University of Mining and Technology

109

Sichuan University

Chinese Academy of Sciences

Shenzhen University

State Key Laboratory for Geomechanics and Deep Underground Engineering

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Tsinghua University

Chongqing Jiaotong University

Harbin Institute of Technology

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Effect of damage evolution of coal on permeability variation and analysis of gas outburst hazard with coal mining

Natural Hazards (2015)

Yi Xue Feng Gao Xingguang Liu

Coalescence (physics)

Acoustic Emission

10.1007/s11069-015-1888-2

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Citations (76)

Experimental study on anti‐crystallization law of tunnel transverse flocking drainpipe at different velocities

Asia-Pacific Journal of Chemical Engineering (2020)

Shiyang Liu Feng Gao Xuefu Zhang Fenglei Han Yuanfu Zhou

Abstract With the increasing of the tunnel operation life, various diseases of the tunnel are gradually highlighted, especially the lining cracking and leakage caused by the crystal blocking pipe of the drainage system, which brings serious hidden trouble to the safe operation of the tunnel. In order to solve the problem of crystal plugging of horizontal drainage pipe in tunnel, the transverse drainage pipe of the tunnel was taken as the research object, combined with the field survey data, and the indoor test was used to analyze the anti‐crystallization law of flocking drainage pipe at different velocities. The results showed that the flocking drainage pipes had an anti‐crystallization effect, and the anti‐crystallization efficiency could be increased by more than 50% compared with the ordinary drainage pipes, and the flow rate at 6.82 cm/s could reach more than 60%. At the flow rate of 5.46 cm/s, the crystallization on flocking drainage pipes at the later stage of the test remained basically unchanged and was less than that on ordinary drainage pipes. The change in the weight of crystals on the flocking drainage pipes was approximately sinusoidal, and the change period was different at different flow rates; among which, the change period of crystallization on the flocking drainpipe was shorter when the villi length was shorter at low flow rates.

Penetration (warfare)

10.1002/apj.2470

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Citations (14)

Experimental study on CH 4 permeability and its dependence on interior fracture networks of fractured coal under different excavation stress paths

Fuel (2017)

Yang Ju Qingang Zhang Jiangtao Zheng Jianguo Wang Chun Chang

Coalbed Methane

10.1016/j.fuel.2017.04.056

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Citations (60)

Simulation and visualization of the displacement between CO2 and formation fluids at pore-scale levels and its application to the recovery of shale gas

International Journal of Coal Science & Technology (2016)

Peng Hou Yang Ju Feng Gao Jianguo Wang Jian He

This article reports recent developments and advances in the simulation of the CO2-formation fluid displacement behaviour at the pore scale of subsurface porous media. Roughly, there are three effective visualization approaches to detect and observe the CO2-formation fluid displacement mechanism at the micro-scale, namely, magnetic resonance imaging, X-ray computed tomography and fabricated micromodels, but they are not capable of investigating the displacement process at the nano-scale. Though a lab-on-chip approach for the direct visualization of the fluid flow behaviour in nanoscale channels has been developed using an advanced epi-fluorescence microscopy method combined with a nanofluidic chip, it is still a qualitative analysis method. The lattice Boltzmann method (LBM) can simulate the CO2 displacement processes in a two-dimensional or three-dimensional (3D) pore structure, but until now, the CO2 displacement mechanisms had not been thoroughly investigated and the 3D pore structure of real rock had not been directly taken into account in the simulation of the CO2 displacement process. The status of research on the applications of CO2 displacement to enhance shale gas recovery is also analyzed in this paper. The coupling of molecular dynamics and LBM in tandem is proposed to simulate the CO2-shale gas displacement process based on the 3D digital model of shale obtained from focused ion beams and scanning electron microscopy.

Lattice Boltzmann methods

10.1007/s40789-016-0155-9

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Citations (19)

How moisture loss affects coal porosity and permeability during gas recovery in wet reservoirs?

International Journal of Mining Science and Technology (2017)

Teng Teng Feng Gao Yang Ju Yi Xue

Moisture in coal seams changes gas adsorption capacity, induces coal deformation, and affects coal porosity. However, fewer studies have investigated the dynamic process of moisture loss. In this study, a fully coupled multi-physical model for coal deformation, gas flow and moisture loss was implemented. It validated the coal-gas-moisture interactions of the decay of gas adsorption capacity and the coal shrinkage. Subsequently, the proposed model was applied to a simulation of coal seam gas recovery from wet reservoir and solved using the finite method in COMSOL Multiphysics 3.5. Analyses of the component factors and the sensitive parameters of moisture loss on coal porosity and permeability were comprehensively studied at last. The results reveal that moisture loss enhances coal porosity and permeability. The decay of gas adsorption capacity decreases coal permeability while the coal shrinkage promotes it. The decrease of the adsorption decay coefficient and the increase of the initial density of saturated water vapor and water evaporation constant can enhance the permeability of wet coal seams.

Multiphysics

Shrinkage

10.1016/j.ijmst.2017.06.016

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Citations (30)

Numerical Simulations on the Front Motion of Water Permeation into Anisotropic Porous Media

Geofluids (2019)

Xiangxiang Zhang Jianguo Wang Xiaolin Wang Feng Gao

Water permeation into a porous medium is a common but important phenomenon in many engineering fields such as hydraulic fracturing. The water permeation front moves with time and may significantly impact the field variable evolution near the water front. Many algorithms have been developed to calculate this water front motion, but few numerical algorithms have been available to calculate the water front motion in anisotropic fluid-solid couplings with high computational efficiency. In this study, a numerical model is proposed to investigate the front motion of water permeation into an anisotropic porous medium. This model fully couples the mechanical deformation, fluid flow, and water front motion. The water front motion is calculated based on a directional Darcy’s flow in the anisotropic porous medium, and a revised formula with a correction coefficient is developed for the estimation of permeation depth. After verification with three sets of experimental data, this model is used to numerically investigate the impacts of permeability, viscosity, permeability anisotropy, and mechanical anisotropy on water front motion. Numerical results show that the proposed model can well describe the anisotropic water permeation process with reasonable accuracy. The permeation depth increases with permeability, mobility, and mechanical anisotropy but decreases with viscosity and permeability anisotropy. The correction coefficient mainly depends on porosity evolution, flow pattern, mobility, permeability anisotropy, and mechanical anisotropy.

Viscous fingering

10.1155/2019/7692490

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Citations (4)

Study on Fluid Front Motion of Water, Nitrogen, and CO2 during Anisotropic Flow in Shale Reservoirs

Geofluids (2022)

Xiangxiang Zhang Kai Gu Chengyu Liu Yangbing Cao Jianguo Wang

The fluid front motion is an important phenomenon during anisotropic fluid flow in rock engineering. The pore pressure and mechanical responses may be significantly influenced and show an obvious difference near the moving fluid front. However, few studies have been conducted to investigate the front motion of different types of fluids during anisotropic fluid flow. In this work, a numerical model was proposed to detect the front motion of water, nitrogen, and CO2 in anisotropic shale reservoirs. The full coupling effects among mechanical deformation, fluid flow, and moving boundary in anisotropic porous media were considered in the model construction. The impacts of different fluid properties among water, nitrogen, and CO2 on the anisotropic fluid flow have been discussed. Then, the proposed model was applied to study the differences in front motion among different types of fluids in anisotropic shales. The impacts of permeability and mobility on fluid front motion were investigated. The theoretical equations for predicting the fluid front motion of different types of fluids were established by introducing corresponding correction coefficients to the previous formulas. The results showed that the model can well describe the anisotropic fluid permeation process. The fluid front motion increased with the increase of permeability and mobility. At the same permeability or mobility, the nitrogen front motion was the largest and the water front motion was the smallest. The difference in fluid front motion among water, nitrogen, and CO2 was caused by the difference of their viscosity and compressibility. The proposed formulas can fast and accurately predict the evolution of fluid front motion for different types of fluids.

Viscous fingering

10.1155/2022/7202972

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Citations (0)

Research on parameterized modeling and mechanical characteristics of shearer cables

PLoS ONE (2024)

Lijuan Zhao Haining Zhang Feng Gao Shijie Yang

Shearer cables, subjected to large deformations and exposed to harsh working conditions during frequent back-and-forth movements, pose difficulties in achieving comprehensive mechanical performance and extended fatigue life. This study addresses parametric modeling challenges related to determining tangency within and between layers, recursively generating spiral curves from the (n-1)-th level to the n-th level, and constructing irregular surfaces for insulation and sheath. Investigating tensile and bending properties, the research explores the impact of varying pitch diameter ratios at different stranding levels, stranding directions, and monofilaments on mechanical performance across scales. The results reveal a nonlinear increase in stress in power and control conductors with growing pitch diameter ratios. The optimal combination is determined as a pitch diameter ratio of 6 for cabling, 5 for the control conductor, and 14 for the power conductor. The predicted fatigue life of the improved cable by Ncode aligns with bending test results, demonstrating functionality up to 15.12e4 cycles. Stress distribution in parallel stranding is lower and more even, tending to scatter. Conversely, counter stranding experiences relatively higher stress, ensuring a more stable structure. While maintaining a constant effective conductor cross-sectional area, finer monofilaments result in higher cross-sectional filling ratios, enhancing tensile and bending performance.

10.1371/journal.pone.0304007

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Citations (2)

Quantitative visualization and characteristics of gas flow in 3D pore-fracture system of tight rock based on Lattice Boltzmann simulation

Journal of Natural Gas Science and Engineering (2021)

Peng Hou Xin Liang Feng Gao Jiabin Dong Jian He

Tight gas

Slippage

Lattice Boltzmann methods

10.1016/j.jngse.2021.103867

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Citations (61)

Study on Coal Seam Damage Caused by Liquid Nitrogen Under Different Ground Temperature Conditions

Journal of Energy Resources Technology (2021)

Zekai Wang Feng Gao Chengzheng Cai Shanjie Su Menglin Du

Abstract The thermal stress caused by the ultra-low temperature of liquid nitrogen (LN2) can seriously affect the porosity of the coalbed. In this paper, the effects of various temperature differences on the LN2 damage were studied by changing the initial temperature, so as to explore the effect of LN2 on coal seam with different buried depth. The X-ray diffraction (XRD), scanning electron microscope (SEM), wave velocity, acoustic emission (AE), and uniaxial compression experiments were used in the experiments. The experimental results show that LN2 causes a lot of damage to coal and the LN2 effect increase at first and then decrease with the increase of the initial temperature. When the initial temperature is 293 K, before and after liquid nitrogen treatment, the wave velocity damage of the coal sample reaches 0.2207 and the compressive strength decreases by 27.92%. These two values are 0.3697 and 47.37% at the initial temperature of 323 K, and 0.2727 and 28.27% at the initial temperature of 353 K. This is because if the temperature exceeds 353 K, it will cause a 3.17% drop in water content, thus reducing the damage caused by LN2, resulting in the overall effect slightly lower than that at 323 K.

Liquid nitrogen

10.1115/1.4052414

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Citations (5)