Yang Ju

China University of Mining and Technology

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Feng Gao

China University of Mining and Technology

Heping Xie

Sichuan University

Jiangtao Zheng

China University of Mining and Technology

Lingtao Mao

China University of Mining and Technology

Yang Yon

China University of Mining and Technology

Yongliang Wang

Harbin University of Science and Technology

Jianguo Wang

China University of Mining and Technology

Wenbo Gong

Tsinghua University

Hong Zhou

China University of Mining and Technology

Zhangyu Ren

Powerchina Huadong Engineering Corporation (China)

Cooperative Institutions

China University of Mining and Technology

126

Chinese Academy of Sciences

Tsinghua University

Sichuan University

Lawrence Berkeley National Laboratory

Shenzhen University

Sinopec (China)

University of California, Berkeley

China University of Petroleum, Beijing

Northern Arizona University

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Influence of pore structures on the mechanical behavior of low-permeability sandstones: numerical reconstruction and analysis

International Journal of Coal Science & Technology (2014)

Jiangtao Zheng Yang Ju Xi Zhao

The research of rock properties based on its inherent microscopic to mesoscopic porous structure has drawn great attention for its potential in predicting the macroscopic behavior of rocks. An accurate reconstruction of the three-dimensional porous structure is a premise for the related studies of hydraulic and mechanical properties of rocks, such as the transport properties and mechanical responses under pressures. In this paper, we present a computer procedure for reconstructing the 3D porous structure of low-permeability sandstone. Two large-size 3D models are reconstructed based on the information of a reference model which is established from computed tomography (CT) images. A self-developed finite element method is applied to analyze the nonlinear mechanical behavior of the sandstone based on its reconstructed model and to compare the results with those based on the reference model. The good consistency of the obtained mechanical responses indicates the potential of using reconstruction models to predict the influences of porous structure on the mechanical properties of low-permeability sandstone.

Mesoscopic physics

10.1007/s40789-014-0020-7

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Citations (18)

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)

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Energy Science & Engineering (2020)

Yang Ju Xiaodong Nie Yan Zhu Heping Xie

Abstract Coal remains a primary energy source for the foreseeable future. However, existing approaches for coal exploitation and utilization are highly detrimental to the geological formations from which they are extracted and the atmospheric environment. Moreover, underground mining can induce earthquakes that lead to fatalities and financial losses. The demand to abandon coal mining is increasing worldwide, and the need for efficient, safe, and environmentally acceptable coal exploitation and utilization has garnered widespread attention. We propose a novel unmanned automatic machine‐based mining and in situ conversion method for the safe and clean exploitation and utilization of subsurface coal resources. Solid coal is transformed in situ into fluidized energy resources using this method. To evaluate its effectiveness, a geological model of a coal mine was generated, and a numerical simulation based on the continuum‐based discrete element method was conducted to compare the mining‐induced stress distribution, roof subsidence, coal wall failure, and microseismicity for fluidized and traditional mining methods. Our results indicate that the proposed mining method can significantly reduce damage to the geological formation and greenhouse gas emissions associated with the exploitation and utilization of coal resources. We also discuss the limitations of the current study and future research possibilities.

Lead (geology)

10.1002/ese3.812

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Citations (12)

Evaluation of Global and Local Digital Volume Correlation for Measuring 3D Deformation in Rocks

Rock Mechanics and Rock Engineering (2021)

Lingtao Mao Haizhou Liu YU Lei Jingcheng Wu Yang Ju

Indentation

Digital image correlation

10.1007/s00603-021-02517-9

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Citations (13)

Stress distribution and roof subsidence of surrounding strata considering in situ coal conversion and CO2 mineralization backfilling: Photoelastic experiments using 3D-printed models of mining faces and goafs

The Science of The Total Environment (2023)

Yang Ju Xiaodong Nie Yan Zhu Kai Wang Hong Zhou

10.1016/j.scitotenv.2023.169368

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Citations (4)

LABORATORY RESEARCH ON EFFECT OF FREEZE-THAW CYCLES TO SHEAR STRENGTH OF WEATHERED SAND IMPROVED WITH EXPANSIVE SOIL

Journal of Engineering Geology (2015)

Yang Ju

This paper investigates the qualitative and quantitative relationships among shear strength of weathered sand improved with expansive soil,weathered sand content and cycle times of freeze-thaw tests. The expansive soil is added with weathered sand with the percentages of 0,10%,20%,30%,40%,50%,respectively. The shear strength test is done using direct shear apparatus on the samples after 0,1,3,6,9,12 cycles of freezing and thawing. Test results show that as the cycles of freeze-thaw increases,the shear indexes and the shear strength of weathered sand improved expansive soil first increase and then decrease and gradually reach stable after several times of freeze-thaw cycles for samples with the same sand ratio. The relationship between cohesive force and freeze-thaw cycles can be expressed in logarithmic function. As the mixed sand ratio increases,the cohesion decrease but the internal frictional angle increases for samples with the same cycles of freeze and thaw.

Cohesion (chemistry)

Expansive clay

Direct shear test

Shear Strength

Expansive

Friction angle

Triaxial shear test

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Citations (1)

Research on in-situ condition preserved coring and testing systems

Petroleum Science (2021)

Heping Xie Tao Liu Mingzhong Gao Ling Chen Hong Zhou

As shallow resources are increasingly depleted, the mechanics' theory and testing technology of deep in-situ rock has become urgent. Traditional coring technologies obtain rock samples without retaining the in-situ environmental conditions, leading to distortion of the measured parameters. Herein, a coring and testing systems retaining in-situ geological conditions is presented: the coring system that obtains in-situ rock samples, and the transfer and testing system that stores and analyzes the rocks under a reconstructed environment. The ICP-Coring system mainly consists of the pressure controller, active insulated core reactor and insulation layer and sealing film. The ultimate bearing strength of 100 MPa for pressure-preservation, temperature control accuracy of 0.97% for temperature-retained are realized. CH4 and CO permeability of the optimized sealing film are as low as 3.85 and 0.33 ppm/min. The average tensile elongation of the film is 152.4% and the light transmittance is reduced to 0%. Additionally, the pressure and steady-state temperature accuracy for reconstructing the in-situ environment of transfer and storage system up to 1% and ±0.2 is achieved. The error recorded of the noncontact sensor ring made of low-density polymer is less than 6% than that of the contact test. The system can provide technical support for the deep in-situ rock mechanics research, improving deep resource acquisition capabilities and further clarifying deep-earth processes.

Coring

10.1016/j.petsci.2021.11.003

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Citations (51)

Numerical analysis of the effects of bedded interfaces on hydraulic fracture propagation in tight multilayered reservoirs considering hydro-mechanical coupling

Journal of Petroleum Science and Engineering (2019)

Yang Ju Yongliang Wang Bo Xu Jialiang Chen Yang Yon

10.1016/j.petrol.2019.03.049

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Citations (39)