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Study and application of the influence of inclination angle on the cross-fusion mechanism of high gas thick coal seam

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International Journal of Mining Science and Technology 2025年第1期35卷 69-85页

作者： Pengxiang Zhao Zechen Chang Shugang Li Risheng Zhuo Yongyong Jia Qiudong Shao Wen Lei College of Safety Science and Engineering Xi'an University of Science and TechnologyXi’an 710054China Western Mining Gas Intelligent Extraction Engineering Research Centre Xi’an 710054China Xinjiang Coal and coalbed methane Engineering Technology Research Centre Urumqi 830091China Xinjiang Key Laboratory of Coal Mine Disaster Intelligent Prevention and Emergency Response Xinjiang Institute of EngineeringUrumqi 830023China Xinjiang Uygur Autonomous Region Coal Science Research Institute Urumqi 830091China Xinjiang Changji Heze Tengda Mining Co. Ltd.Changji 831100China

In this study,to better decide the effect of coal seam dip angle upon the dynamic change of the crossfusion in gas transport and storage areas during the progress of working face in the high gas thick coal seam,a two-dimensional physical simulation experiment regarded as the theoretical research was conducted to properly explore the variation law of overburden *** results demonstrated that the boundary of the gas transport zone was located in the region of fracture *** boundary of the gas storage area was located in the abrupt penetration ***,according to the information theory,the state of the gas transport and storage areas was determined by the changing trend of the fracture rate and fracture *** mathematical representation model of the dip effect in gas transport and storage areas was *** criteria upon which the regional location of the gas transport area and gas storage area can be based were put *** cross-fusion evolution process of the dip effect in gas transport and storage areas was revealed as *** research results could provide guidance for realising directional and accurate gas extraction.

关键词： Coal seam dip angle Cross fusion High gas thick coal seam Overburden fracture Gas transport and storage areas

A Productivity Prediction Method Based on Artificial Neural Networks and Particle Swarm Optimization for Shale-Gas Horizontal Wells

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Fluid Dynamics & Materials Processing 2023年第10期19卷 2729-2748页

作者： Bin Li china united coalbed methane corp.ration Ltd.Beijing100011China

In order to overcome the deﬁciencies of current methods for the prediction of the productivity of shale gas hor-izontal wells after fracturing,a new sophisticated approach is proposed in this *** new model stems from the combination several techniques,namely,artiﬁcial neural network(ANN),particle swarm optimization(PSO),Imperialist Competitive Algorithms(ICA),and Ant Clony Optimization(ACO).These are properly implemented by using the geological and engineering parameters collected from 317 *** results show that the optimum PSO-ANN model has a high accuracy,obtaining a R2 of 0.847 on the *** partial dependence plots(PDP)indicate that liquid consumption intensity and the proportion of quartz sand are the two most sensitive factors affecting the model’s performance.

关键词： Shale gas productivity prediction ANN meta-heuristic algorithm PDP

Targeting ASK1 by CS17919 alleviates kidney-and liver-related diseases in murine models

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Animal Models and Experimental Medicine 2025年第1期8卷 102-113页

作者： Guoqiang Liao Qianjiao Yang Xuhua Mao Yiru Zhao Beizhong Chen Kun Zhang Yu Zhang Ping Zhang Zhengli Chen Shengjian Huang Chengdu Chipscreen Pharmaceutical corp. Ltd.ChengduSichuanP.R.China Laboratory of Experimental Animal Disease Model College of Veterinary MedicineSichuan Agricultural UniversityChengduSichuanP.R.China Shenzhen Chipscreen Biosciences Co. Ltd.ShenzhenGuangdongP.R.China

Background:Apoptosis signal-regulating kinase 1(ASK1)is a MAP3K kinase in the MAPK signaling pathway activated by stressors and triggers downstream biological effects such as inflammation and apoptosis;therefore,inhibition of ASK1 kinase ac-tivity can protect cells from pathological *** this study,we designed and synthe-sized a novel selective ASK1 inhibitor,CS17919,and investigated its pharmacological effects in various animal models of metabolic ***:First,we validated the ability of CS17919 to inhibit ASK1 in vitro and then tested the safety profile of CS17919 in cell lines compared with Selonsertib(GS-4997),a phase III ASK1 *** then conducted pharmacokinetic(PK)studies in ***,we tested the in vivo efficacy of CS17919 in murine models of chronic kidney disease(CKD)and non-alcoholic steatohepatitis(NASH).Results:Compared to GS-4997,CS17919 demonstrated comparable inhibition of ASK1 in vitro,exhibited lower toxicity,and provided greater protection in palmitic acid-treated LO2 ***17919 also showed pronounced pharmacokinetic prop-erties such as a high plasma *** the unilateral ureteral obstruction model(UUO),CS17919 and GS-4997 preserved kidney function and showed a non-significant tendency to alleviate kidney *** the diabetic kidney disease(DKD)model,CS17919 significantly improved serum creatinine and glomerular *** the NASH model,the combination of CS17919 and a THRβagonist(CS27109)was found to significantly improve liver inflammation and substantially reduced liver ***:CS17919 showed cell protective,anti-inflammatory,and antifibrotic ef-fects in vitro and in vivo,suggesting its therapeutic potential for metabolic-related kidney and liver diseases.

关键词： ASK1_(1) CKD_(4) CS17919_(2) GS-4997_(3) NASH_(5)

The generalized method for estimating reserves of shale gas and coalbed methane reservoirs based on material balance equation

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Petroleum Science 2022年第6期19卷 2867-2878页

作者： Jun-Tai Shi Yan-Ran Jia Long-Long Zhang Chang-Jiang Ji Guo-Fu Li Xian-Yue Xiong Hong-Xing Huang Xiang-Fang Li Sui-An Zhang State Key Laboratory of Petroleum Resources and Prospecting in china University of Petroleum(Beijing) Beijing102249China coalbed methane Research Center China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Coal and CBM Co-Mining in Nancun Town Jincheng048012ShanxiChina Petro china coalbed methane Company Limited Beijing100028China china united coalbed methane National Engineering Research Center Co.Ltd Beijing100095China

As the main unconventional natural gas reservoirs,shale gas reservoirs and coalbed methane(CBM)reservoirs belong to adsorptive gas reservoirs,i.e.,gas reservoirs containing adsorbed *** gas and CBM reservoirs usually have the characteristics of rich adsorbed gas and obvious dynamic changes of porosity and permeability.A generalized material balance equation and the corresponding reserve evaluation method considering all the mechanisms for both shale gas reservoirs and CBM reservoirs are *** this work,a generalized material balance equation(GMBE)considering the effects of critical desorption pressure,stress sensitivity,matrix shrinkage,water production,water influx,and solubility of natural gas in water is ***,by converting the GMBE to a linear relationship between two parameter groups related with known formation/fluid properties and dynamic performance data,the straight-line reserve evaluation method is *** using the slope and the y-intercept of this straight line,the original adsorbed gas in place(OAGIP),original free gas in place(OFGIP),original dissolved gas in place(ODGIP),and the original gas in place(OGIP)can be quickly ***,two validation cases for shale gas reservoir and CBM reservoir are conducted using commercial reservoir simulator and the coalbed methane dynamic performance analysis software,***,two field studies in the Fuling shale gas field and the Baode CBM field are *** show that the GMBE and the corresponding straight-line reserve evaluation method are rational,accurate,and effective for both shale gas reservoirs and CBM *** detailed information about reserves of shale gas and CBM reservoirs can be clarified,and only the straight-line fitting approach is used to determine all kinds of reserves without iteration,proving that the proposed method has great advantages compared with other current methods.

关键词： Shale gas coalbed methane Material balance equation Reserve evaluation Dissolved gas Generalized method

Experimental study on the coupling effect of pore-fracture system and permeability controlled by stress in high-rank coal

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Frontiers of Earth Science 2023年第1期17卷 135-144页

作者： Jiang HAN Caifang WU Lu CHENG Key Laboratory of coalbed methane Resources and Reservoir Formation(Ministry of Education of china) China University of Mining and TechnologyXuzhou 221116China School of Resources and Geoscience China University of Mining and TechnologyXuzhou 221116China china united coalbed methane corp.ration Ltd.Beijing 100016China

During the coalbed methane(CBM)exploitation,the reservoir permeability can be affected by the effective stress that varies with the reservoir fluid pressure,which is a complex,dynamic and significant engineering *** analyze the response characteristics of the pore-fracture system by the changing stress,this work simulated reservoir and fluid pressures during the exploitation by adjusting confining pressure and displacement *** sensitivity experiments under different effective stresses were conducted to systematically study the stage variation characteristics of porosity and permeability of *** results show that the permeability decreases exponentially with the increase in effective stress,consistent with previous ***,the porosity shows a V-shaped trend,which is different from the traditional understanding that it would decrease continuously with rising effective *** variation characteristics(of porosity and permeability above)therefore result in a phased porosity sensitivity of coal permeability(PPS).Moreover,the stress sensitivity of the samples was evaluated using the permeability damage rate method(MPDR)and the stress sensitivity coefficient method(MCSS),both of which showed that it ranges from the degree of strong to extremely *** the effective stress is lower than 5–6 MPa,the stress sensitivity of the coal reservoir drops rapidly with effective stress rising;when it is higher than 5–6 MPa,the change in stress sensitivity tends to flatten out,and the stress sensitivity coefficient(CSS)goes down slowly with rising effective ***,suggestions are proposed for the drainage scheme of CBM wells based on the experimental results.

关键词： stress sensitivity porosity sensitivity permeability high-rank coal effective stress

Study on in-situ microbial methanogenesis of CO2 and in-situ inhibition of H2S and increase of coalbed methane production in low-quality coalbed methane of the Southern Junggar Basin

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Meitan Xuebao/Journal of the china Coal Society 2025年第1期50卷 532-545页

作者： Su, Xianbo Ding, Rui Zhao, Weizhong Yan, Detian Li, Ruiming Wang, Yibing Wang, Haichao Huang, Shenghai Zhou, Yixuan Wang, Xiaoming Fu, Haijiao School of Resources and Environment Henan Polytechnic University Jiaozuo454000 China Unconventional gas research institute Henan Polytechnic University Jiaozuo454000 China School of Energy Resources China University of Geosciences Wuhan430074 China Collaborative Innovation Center of coalbed methane and Shale Gas for Central Plains Economic Region Jiaozuo454000 China Xinjiang Coal Field Geology Bureau Urumqi830091 China Co. Ltd. Urumqi830011 China School of Geological and Mining Engineering Xinjiang University Urumqi830047 China Co. Ltd. Urumqi830011 China

The development and utilization of coalbed methane (CBM) not only ensures national energy security, but also provides a boost to carbon neutrality. The southern edge of the Junggar Basin is a major CBM resource area and a key development hotspot in china. However, the region has few high-yield wells, and maintaining stable production is challenging. There is an urgent need for a technology that can increase the production of CBM resources within the control range of a single well. Additionally, high volume fractions of CO2 and H2S have become common in the CBM of this region, creating an urgent need for in-situ disposal technology for these gases. coalbed gas bioengineering offers a promising technology for enhancing both the quality and production of CBM in this region. On-site monitoring and laboratory simulation experiments indicate that the CO2 volume fraction is closely linked to reservoir temperature. Acid-producing fermentative bacteria and Hydrogen-producing acetic acid bacteria remain active and continue to produce CO2 across a broad range of reservoir temperatures. At lower reservoir temperatures, the metabolism of hydrogenotrophic methanogens is weak and CO2 is difficult to be reduced, which is the main reason for the high CO2 volume fraction in this area. It was also found that the microbial community in the groundwater interacts with organic matter and SO24− during migration. H2S is generated when the groundwater recharge and drainage rates are consistent with the metabolic cycle of methanogens, which is called epigenetic H2S. The presence of these two acidic gases not only compromises production safety but also significantly reduces the quality of CBM. This study introduces a key technology for in-situ microbial-mediated enhancement of CBM quality and production, addressing the issue of low-quality CBM in southern Junggar Basin. The necessity and feasibility of this technology are discussed, highlighting its potential to enhance CBM production, facilit

关键词： Coal deposits

In-situ stress distribution and coalbed methane reservoir permeability in the Linxing area, eastern Ordos Basin, china

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Frontiers of Earth Science 2018年第3期12卷 545-554页

作者： Wei JU Jian SHEN Yong QIN Shangzhi MENG Chao LI Guozhang LI Guang YANG Key Laboratory of coalbed methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Xuzhou 221008 China School of Resources and Geosciences China-University of Mining and Technology Xuzhou 221116 China china united coalbed methane corp.ration Ltd. Beijing 100011 China

Understanding the distribution of in-situ stresses is extremely important in a wide range of fields such as oil and gas exploration and development, CO2 sequestration, borehole stability, and stress-related geohazards assessment. In the present study, the in-situ stress distribution in the Linxing area of eastern Ordos Basin, china, was analyzed based on well tested parameters. The maximum horizontal principal stress （SHmax）, minimum horizontal principal stress （Shmin）, and vertical stress （Sv） were calculated, and they were linearly correlated with burial depth. In general, two types of in-situ stress fields were determined in the Linxing area：（i） the in-situ stress state followed the relation Sv 〉 Snmax 〉 Shmin in shallow layers with burial depths of less than about 940 m, indicating a normal faulting stress regime; （ii） the Snmax magnitude increased conspicuously and was greater than the Sv magnitude in deep layers with depths more than about 940 m, and the in-situ stress state followed the relation Snmax 〉 Sv 〉 Shmin, demonstrating a strike-slip faulting stress regime. The horizontal differential stress （Snmax-Shmtn） increased with burial depth, indicating that wellbore instability may be a potentially significant problem when drilling deep vertical wells. The lateral stress coefficient ranged from 0.73 to 1.08 with an average of 0.93 in the Linxing area. The coalbed methane （CBM） reservoir permeability was also analyzed. No obvious exponential relationship was found between coal permeability and effective in-situ stress magnitude. Coal permeability was relatively high under a larger effective in-situ stress magnitude. Multiple factors, including fracture development, contribute to the variation of CBM reservoir permeability in the Linxing area of eastern Ordos Basin.

关键词： in-situ stress coalbed methane permeability lateral stress coefficient Linxing area Ordos Basin

Excess pore pressure behavior and evolution in deep coalbed methane reservoirs

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International Journal of Mining Science and Technology 2024年第6期34卷 763-781页

作者： Changqing Liu Zhaobiao Yang Yong Qin Xia Yan Yunhai Wang Zhe Wang Key Laboratory of coalbed methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of coalbed methane Development&Utilization Beijing 100095China Petrochina coalbed methane Company Limited Beijing 102200China SINOPEC East china Oil and Gas Company Nanjing 210000China

Deep coalbed methane(DCBM),an unconventional gas reservoir,has undergone significant advancements in recent years,sparking a growing interest in assessing pore pressure dynamics within these *** some production data analysis techniques have been adapted from conventional oil and gas wells,there remains a gap in the understanding of pore pressure generation and evolution,particularly in wells subjected to large-scale hydraulic *** address this gap,a novel technique called excess pore pressure analysis(EPPA)has been introduced to the coal seam gas industry for the first time to our knowledge,which employs dual-phase flow principles based on consolidation *** technique focuses on the generation and dissipation for excess pore-water pressure(EPWP)and excess pore-gas pressure(EPGP)in stimulated deep coal *** have been developed respectively and numerical solutions have been provided using the finite element method(FEM).Application of this model to a representative field example reveals that excess pore pressure arises from rapid loading,with overburden weight transferred under undrained condition due to intense hydraulic fracturing,which significantly redistributes the weight-bearing role from the solid coal structure to the injected fluid and liberated gas within artificial pores over a brief ***,field application indicates that the dissipation of EPWP and EPGP can be actually considered as the process of well production,where methane and water are extracted from deep coalbed methane wells,leading to consolidation for the artificial ***,history matching results demonstrate that the excess-pressure model established in this study provides a better explanation for the declining trends observed in both gas and water production curves,compared to conventional practices in coalbed methane reservoir engineering and petroleum *** research not only enhances the understanding of DCBM re

关键词： Deep coalbed methane Consolidation Excess pore-water pressure Excess pore-gas pressure Production data analysis

Origin of deep carbonate reservoir in northeastern Sichuan Basin:New insights from in-situ hydrothermal diamond anvil cell experiments

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Journal of Central South University 2017年第6期24卷 1450-1464页

作者： ZHANG Shan-ming LIU Bo QIN Shan ZHANG Xue-feng TIAN Yong-jing GUO Rong-tao LIU Jian-qiang School of Earth and Space Sciences Peking UniversityBeijing 100871China Institute of Oil and Gas Peking UniversityBeijing 100871China china united coalbed methane corp.ration Ltd Beijing 100011China

In situ Raman analysis on the segregated near-equilibrium carbonate-fluid interaction at elevated temperatures(room temperature-260 °C) and pressures(13-812 MPa) in a hydrothermal diamond anvil cell(HDAC) reveals the preservation mechanism of porosity in deep carbonate reservoirs in the northeastern Sichuan Basin. The carbonate-fluid interaction was investigated by separately heating carbonate minerals and rocks with four different acid solutions(saturated CO2 and H2 S solutions, HCl, CH3COOH) in a sealed sample chamber. A minor continuous precipitation with increasing temperatures and pressures was observed during the experiments which caused minor sample volume change. The closed system is a preservation of pores and burial dissolution may not be the dominant diagenesis in the origin of porosity. Thin section photomicrographs observations in Changxing and Feixianguan Formations demonstrate that eogenetic pores such as moldic or intragranular pores with late small euhedral minerals, intergranular, intercrystal and biological cavity pores are the main pore types for the reservoirs. Early fast deep burial makes the porous carbonate sediments get into the closed system as soon as possible and preserves the pores created in the early diagenetic stage to make significant contribution to the deep reservoir quality. The anomalous high porosity at a given depth may come from the inheritance of primary pores and eogenetic porosity is fundamental to carbonate reservoir development. The favorable factors for deep reservoir origin include durable meteoric leaching, early fast deep burial, early dolomitization, etc. This deep pores preservation mechanism may be of great importance to the further exploration in deep carbonate reservoirs in the northeastern Sichuan Basin.

关键词： hydrothermal diamond anvil cell (HDAC) closed system early fast deep burial porosity preservation Sichuan Basin