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Mechanism of micro-wetting of highly hydrophobic coal dust in underground mining and new wetting agent development

International Journal of Mining Science and Technology 2023年第1期33卷 31-46页

作者： Mingzhong Gao Hongmei Li Yun Zhao Yiting Liu Weiqi Zhou Luming Li Jing Xie Jie Deng State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China College of Food and Bioengineering Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

The internal mechanism of the high hydrophobicity of the coal samples from the Pingdingshan mining area was studied through industrial,element,and surface functional group *** testing and molecular dynamics simulations were employed to study the impact of three types of surfactants on the surface adsorption properties and wettability of highly hydrophobic bituminous *** results show that the surface of highly hydrophobic bituminous coal is compact,rich in inorganic minerals,and poorly wettable and that coal molecules are dominated by hydrophobic functional groups of aromatic rings and aliphatic *** wetting performance of surfactants as the intermediate carrier to connect coal and water molecules is largely determined by the interaction force between surfactants and coal(Fs-c)and the interaction force between surfactants and water(Fs-w),which effectively improve the wettability of modified coal dust via modifying its surface electrical properties and surface energy.A new type of wetting agent with a dust removal rate of 89%has been developed through discovery of a compound wetting agent solution with optimal wetting and settling *** paper provides theoretical and technical support for removing highly hydrophobic bituminous coal dust in underground mining.

关键词： Dust removal technology Bituminous coal dust New dust suppressant Mine safety Molecular dynamics

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Study on the geothermal production and reinjection mode in Xiong County

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Journal of Groundwater Science and Engineering 2018年第3期6卷 178-186页

作者： WANG Shu-fang LIU Jiu-rong SUN Ying LIU Shi-liang GAO Xiao-rong SUN Cai-xia LI Hai-kui Beijing Institute of Hydrogeology and Engineering Geology Beijing 100195China SINOPEC Star Co.Ltd. Beijing 100083China SINOPEC Green energy geothermal Development Co. Ltd.Xiong County 071800China

The large karst geothermal field of Xiong County,which is located to the south of geothermal field in Niutuozhen,features huge geothermal resources and favorable condition for development and *** of the long-term extensive production,the pressure of geothermal reservoir continues to decline and some geothermal wells even face the danger of *** relieve the fall in pressure of geothermal reservoir and achieve the sustainable development and utilization of geothermal field in the long run,reinjection experiment is conducted in the geothermal field of Xiong County and a three-dimensional hydrothermal coupled numerical model was *** reinjection experiment showed that the mode of one production well and one reinjection well can be achieved in this geothermal *** numerical simulation is used to forecast and compare the change in pressure field and temperature field under different production and reinjection modes and concludes that the most opotimized production and utilization mode is the concentrated production-reinjection mode,and the most opotimized production-reinjection combination mode is the shallow production and shallow reinjection mode which can ensure the sustainable development and utilization of geothermal resources in the long run.

关键词： geothermal Karst geothermal reservoir Reinjection Numerical simulation

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Ultrasonic prediction of crack density using machine learning:A numerical investigation

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Geoscience Frontiers 2022年第1期13卷 114-126页

作者： Sadegh Karimpouli Pejman Tahmasebi Erik HSaenger Mining Engineering Group Faculty of EngineeringUniversity of ZanjanZanjanIran Department of Petroleum Engineering University of WyomingLaramieWY 82071USA Bochum University of Applied Sciences 44801 BochumGermany Fraunhofer IEG Fraunhofer Research Institution for Energy Infrastructure and Geothermal Systems44801 BochumGermany Ruhr-University Bochum 44801 BochumGermany

Cracks are accounted as the most destructive discontinuity in rock, soil, and concrete. Enhancing our knowledge from their properties such as crack distribution, density, and/or aspect ratio is crucial in geo-systems. The most well-known mechanical parameter for such an evaluation is wave velocity through which one can qualitatively or quantitatively characterize the porous media. In small scales, such information is obtained using the ultrasonic pulse velocity(UPV) technique as a non-destructive test. In large-scale geo-systems, however, it is inverted from seismic data. In this paper, we take advantage of the recent advancements in machine learning(ML) for analyzing wave signals and predict rock properties such as crack density(CD) – the number of cracks per unit volume. To this end, we designed numerical models with different CDs and, using the rotated staggered finite-difference grid(RSG) technique, simulated wave propagation. Two ML networks, namely Convolutional Neural Networks(CNN) and Long Short-Term Memory(LSTM), are then used to predict CD values. Results show that, by selecting an optimum value for wavelength to crack length ratio, the accuracy of predictions of test data can reach R2> 96% with mean square error(MSE) < 25e-4(normalized values). Overall, we found that:(i) performance of both CNN and LSTM is highly promising,(ii) accuracy of the transmitted signals is slightly higher than the reflected signals,(iii) accuracy of 2D signals is marginally higher than 1D signals,(iv)accuracy of horizontal and vertical component signals are comparable,(v) accuracy of coda signals is less when the whole signals are used. Our results, thus, reveal that the ML methods can provide rapid solutions and estimations for crack density, without the necessity of further modeling.

关键词： Machine learning Crack density Ultrasonic wave Numerical computation

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Experimental investigation on crack initiation and damage stresses of deep granite under triaxial compression using acoustic methods

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 3071-3078页

作者： Xiaoling Zhao Tao Zhou Tianqi Zhai Yang Ju Jianbo Zhu State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil EngineeringTianjin UniversityTianjin300350China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyBeijing100083China

Crack initiation stress and crack damage stress are two critical indices for assessing the fracture strength of rock ***,understanding the stress characteristics of crack initiation and damage under triaxial compression remains still *** address this problem,by acoustic monitoring,*** wave transmission and acoustic emission(AE),the integrated triaxial compression experiments were carried out on granitic *** crack initiation and damage stresses were determined by wave velocity,wave amplitude and AE methods,*** discrepancy of stresses for crack initiation and damage identified by these methods were *** showed that the confinement affected the peak stress and corresponding strain,and these two parameters increased with increasing confining *** ultrasonic wave velocity and wave amplitude first increased and then remained relatively stable,and finally decreased with increasing axial compressive *** number of AE events stayed at a relatively low extent until axial stress approached the peak;after that,the AE accumulative counts skyrocketed to the *** also shows that for a given confinement,the stresses for crack initiation and damage identified by the wave amplitude method were the smallest,followed those by AE method and wave velocity ***,the stresses for crack initiation and crack damage identified by these methods increased generally with confining ***,the rate of increment of these two crack stresses decreased with increasing confining *** addition,the slight decrease in these two crack stresses ratios was noticed with increasing confining *** findings are helpful to understand the crack stresses of deep rocks,in terms of support of deep underground engineering.

关键词： Crack stress Ultrasonic wave Acoustic emission(AE) Triaxial compression

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Development of a pressure coring system for the investigation of deep underground exploration

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International Journal of Mining Science and Technology 2023年第11期33卷 1351-1364页

作者： Da Guo Ling Chen Zhongya Zhou Dingming Wang Yiwei Zhang Xun Yang Xin Fang Xiaojun Wang Heping Lu Lin Dai Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Petroleum Engineering Technology Research Institute of Sinopec Jianghan Oilfield Company Wuhan 430035China

To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyses and numerical *** designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 *** results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the ***,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was ***,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was *** study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.

关键词： Underground exploration In-situ coring Pressure coring Oil and gas production

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Phase Transition and EOS of Cinnabar （α-HgS） at High Pressure and High Temperature

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Chinese Physics Letters 2009年第4期26卷 180-183页

作者：范大伟周文戈刘丛强万方邢印锁刘景李延春谢鸿森 Laboratory for Study of the Earth's Interior and geofluids Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 Institute of High energy Physics Chinese Academy of Sciences Beijing 100049 Graduate University of the Chinese Academy of Sciences Beijing 100049

Phase relations and equation of state （EOS） of natural cinnabar （α-HgS） are investigated by high-pressure and high-temperature synchrotron x-ray powder diffraction. The unambiguous cinnabar-rocksalt structure phase boundaries are determined to be PI （GPa）=15.54- 0.014T（℃） and Pupper（GPa）= 23.84- 0.014T（℃） at 300-623K. With K1 fixed at 4, we obtain K0 = 37（4） GPa, （aK/aT）p= -0.025（2） GPaK-1, and α0 = 3.79（20） × 10-5 K-1 for the cinnabar phase of α-HgS. The （aK/aT）p and α0 of cinnabar phase are obtained for the first time. A nearly isotropic compression of cinnabar phase is observed by linear regressions.

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A Distributionally Robust Optimization Scheduling Model for Regional Integrated energy Systems Considering Hot Dry Rock Co-Generation

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1387-1404页

作者： Hao Qi Mohamed Sharaf Andres Annuk Adrian Ilinca Mohamed A.Mohamed College of Electrical and New energy China Three Gorges UniversityYichang443002China Department of Industrial Engineering College of EngineeringKing Saud UniversityRiyadh11421Saudi Arabia Institute of Forestry and Engineering Estonian University of Life SciencesTartu51006Estonia Department of Mechanical Engineering école de Technologie SupérieureMontréalQC H3C 1K3Canada Electrical Engineering Department Faculty of EngineeringMinia UniversityMinia61519Egypt

Hot dry rock(HDR)is rich in reserve,widely distributed,green,low-carbon,and has broad development potential and *** this paper,a distributionally robust optimization(DRO)scheduling model for a regionally integrated energy system(RIES)considering HDR co-generation is ***,the HDR-enhanced geothermal system(HDR-EGS)is introduced into the ***-EGS realizes the thermoelectric decoupling of combined heat and power(CHP)through coordinated operation with the regional power grid and the regional heat grid,which enhances the system wind power(WP)feed-in ***,peak-hour loads are shifted using price demand response guidance in the context of time-of-day ***,the optimization objective is established to minimize the total cost in the RIES scheduling cycle and construct a DRO scheduling model for RIES with *** simulating a real small-scale RIES,the results show that HDR-EGS can effectively promote WP consumption and reduce the operating cost of the system.

关键词： energy harvesting integrated energy systems optimum scheduling time-of-use pricing demand response geothermal energy

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Direct measurement and theoretical prediction model of interparticle adhesion force between irregular planetary regolith particles

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International Journal of Mining Science and Technology 2023年第11期33卷 1425-1436页

作者： Heping Xie Qi Wu Yifei Liu Yachen Xie Mingzhong Gao Cunbao Li State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Shenzhen UniversityShenzhen 518060China Department of Civil&Mineral Engineering University of TorontoToronto M5S 1A1Canada

Interparticle adhesion force has a controlling effect on the physical and mechanical properties of planetary regolith and *** current research on the adhesion force of planetary regolith and rock particles has been primarily based on the assumption of smooth spherical particles to calculate the intergranular adhesion force;this approach lacks consideration for the adhesion force between irregular shaped *** our study,an innovative approach was established to directly measure the adhesion force between the arbitrary irregular shaped particles;the probe was modified using simulated lunar soil particles that were a typical representation of planetary *** experimental results showed that for irregular shaped mineral particles,the particle size and mineral composition had no significant influence on the interparticle adhesion force;however,the complex morphology of the contact surface predominantly controlled the adhesion *** the contact surface roughness increased,the adhesion force gradually decreased,and the rate of decrease gradually slowed;these results were consistent with the change trend predicted via the theoretical models of quantum ***,a theoretical model to predict the adhesion force between the irregular shaped particles was constructed based on Rabinovich’s theory,and the prediction results were correlated with the experimental measurements.

关键词： Planetary regolith Adhesion force Particle morphology Prediction model

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Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

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International Journal of Mining Science and Technology 2023年第11期33卷 1339-1350页

作者： Hongwei Zhou Mingyuan Lu Heping Xie Wenhao Jia Ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing School of energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green energy Shenzhen UniversityShenzhen 518060China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock *** investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ *** results are compared with existing experimental data to validate the models and calibrate the numerical *** extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are *** influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is *** results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different *** in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and ***,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.

关键词： In-situ pore pressure-preserved environment Numerical simulation approach Deep in-situ rock mechanics In-situ stress restoration and reconstruction

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In-situ pressure-preserved coring for deep exploration:Insight into the rotation behavior of the valve cover of a pressure controller

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Petroleum Science 2023年第4期20卷 2386-2398页

作者： Da Guo He-Ping Xie Ling Chen Zhong-Ya Zhou He-Ping Lu Lin Dai Ding-Ming Wang Tian-Yu Wang Ju Li Zhi-Qiang He Yun-Qi Hu Ming-Zhong Gao School of Mechanical Engineering Sichuan UniversityChengduSichuan610065China MOE Key Laboratory of Deep Underground Science and Engineering College of Water Resource and HydropowerSichuan UniversityChengduSichuan610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhenGuangdong518060China Petroleum Engineering Technology Research Institute of Sinopec Jianghan Oilfield Company WuhanHubei430035China

In-situ pressure-preserved coring(IPP-Coring)is considered to be the most reliable and efficient method for the identification of the scale of oil and gas *** IPP-Coring,because the rotation behavior of the pressure controller valve cover in different medium environments is unclear,interference between the valve cover and inner pipe may occur and negatively affect the IPP-Coring success *** address this issue,we conducted a series of indoor experiments employing a high-speed camera to gain greater insights into the valve cover rotation behavior in different medium environments,e.g.,air,water,and simulated drilling *** results indicated that the variation in the valve cover rotation angle in the air and fluid environments can be described by a one-phase exponential decay function with a constant time parameter and by biphasic dose response function,*** rotation behavior in the fluid environments exhibited distinct elastic and gravitational acceleration *** the fluid environments,the density clearly impacted the valve cover closing time and rotation behavior,whereas the effect of viscosity was very *** can be attributed to the negligible influence of the fluid viscosity on the drag coefficient found in this study;meanwhile,the density can increase the buoyancy and the time period during which the valve cover experienced a high drag *** these results,control schemes for the valve cover rotation behavior during IPP-Coring were proposed for different layers and geological conditions in which the different drilling fluids should be used,e.g.,the use of a high-density valve cover in high-pore pressure layers.

关键词： In-situ coring Pressure coring Pressure controller Rotation behavior Drilling fluid

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