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Influence of Ground Stress on Coal Seam gas Pressure and gas content

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Fluid Dynamics & Materials Processing 2019年第1期15卷 53-61页

作者： Xuebo Zhang Zhiwei Jia The Collaborative Innovation Center of Coal Safety Production of Henan Province Jiaozuo45400China State Key Laboratory Cultivation Base for gas Geology and gas Control Jiaozuo45400China School of Safety Science&Engineering Henan Polytechnic UniversityJiaozuo45400China

The influence of ground stress was quantitatively analyzed on coal seam gas pressure and gas content in this *** activities in coal mine can result in stress concentration in the coal(rock)body around the mining space,but porosity of the coal seam would not change too ***,gas pressure and gas content in the coal seam are slightly *** showed that the free gas was gradually transformed into adsorbed gas,and the gas adsorption volume was small,and then gas pressure increases roughly linearly when the porosity decreased because of stress ***,when porosity of coal seam reduced to 40%,the amount of adsorbed gas accounted for no more than 10%of coal seam gas content,and the increase of gas pressure did not exceed 15%of the original gas pressure.

关键词： Ground stress coal seam porosity gas pressure gas content stress concentration.

Forward modeling and inversion of the relation model between the gas content of plume and its seismic attribute

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Acta Oceanologica Sinica 2021年第5期40卷 120-128页

作者： Canping Li Jiachun You Yanchun Tan Fengying Chen Yilin Liu Zihao Guo Xinyu Tian School of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiang 524088China Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang) Zhanjiang 524006China School of Geophysics Chengdu University of TechnologyChengdu 610059China

The methane bubble plume attracts interest because it offers direct evidence of seafloor gas leakage and plays an indirect role in the exploration and identification of natural gas *** this study,based on established plume models and their migration sections,three amplitude-class attributes were extracted from three formations for the migration sections of five plumes,and the correlation between the gas content and seismic attribute was *** the gas content increases,the amplitude attribute correspondingly increases,and the linear correlation is relatively ***,correlation coefficients between gas content and amplitude attributes are close to *** using linear fitting,the relation model between the gas content of the plume and the seismic attribute was *** relation model was subsequently used to invert the gas content from a real databearing *** of the gas content section of the plume with the attribute section and real seismic section reveals common distribution characteristics,namely,the color of the section in the lower right corner is *** the amplitude value is large in the seismic section of the real plume,the amplitude attribute value is also large in the corresponding attribute section,and the inverted value of the gas content is also large(because gas content and amplitude are linearly correlated),which indicates that the plume bubbles of the section in the lower right corner is intensively ***,the obtained gas content section of the plume can reflect the distribution of the plume bubble content more simply and intuitively,from which the distribution law of seafloor bubbles can be deduced,and this lays a foundation for the further estimation of the gas content of the plume and hydrate reserves.

关键词： methane plume natural gas hydrate gas content seismic attribute linear fitting

New technology of determining coalbed gas content by reversion seal coring

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Journal of Coal Science & Engineering(China) 2012年第1期18卷 35-38页

作者： Chen, Shao-jie Cheng, Gen-yin Xu, A-meng Chen, Xue-xi School of Safety Engineering North China Institute of Science and Technology Beijing China School of Civil and Environment Engineering University of Science and Technology Beijing Beijing China

The key of the direct method of determining coalbed gas content is how to shorten the coal core exposure time in the sampling progress and reduce measuring error of gas content which comes from the calculation of losing gas content. The coring tests were carried out in No.24 drilling field of 715 floor gateway in Qinan Coal Mine by using traditional drill core bar- rel sampler and self-designed reversion seal coring equipment. The losing gas content was calculated by power functional method, and the gas content of two coring methods was determined, respectively. Results show that, compared with traditional drill core barrel sampling, the newly seal coring equipment can significantly shorten the coal core exposure time, the 30 min desorption gas content increases obviously, the calculation of losing gas content reduces by 56.99%, the desorption gas content in normal atmosphere increases by 113.24%, and the determining value of gas content increases by 10.06%. The new technol- ogy has much higher accuracy, and it is worthwhile to be popularized.

关键词： gas content seal coring exposure time losing gas content

Advances in gas content based on outburst control technology in Huainan, China

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International Journal of Mining Science and Technology 2014年第3期24卷 385-389页

作者： Xue Sheng Yuan Liang Xie Juna Wang Yucang CSIRO Earth Science and Resource Engineering Kenmore QLD 4069 Australia Key Laboratory of Integrated Coal Exploitation and gas Extraction Anhui University of Science and Technology School of Mining Engineering Taiyuan University of Science and Technology National Engineering Research Centre for Coal Mine gas Control

The sudden and violent nature of coal and gas outbursts continues to pose a serious threat to coal mine safety in China. One of the key issues is to predict the occurrence of outbursts. Current methods that are used for predicting the outbursts in China are considered to be inadequate, inappropriate or impractical in some seam conditions. In recent years, Huainan Mining Industry Group(Huainan) in China and the Commonwealth Scientific and Industrial Research Organisation(CSIRO) in Australia have been jointly developing technology based on gas content in coal seams to predict the occurrence of outbursts in Huainan. Significant progresses in the technology development have been made, including the development of a more rapid and accurate system in determining gas content in coal seams, the invention of a sampling-while-drilling unit for fast and pointed coal sampling, and the coupling of DEM and LBM codes for advanced numerical simulation of outburst initiation and propagation. These advances are described in this paper.

关键词： Coal mining Outburst Outburst prediction gas content Numerical model ing

Influencing factors of gas content evaluation for shale gas:a case study of Lower Paleozoic Wuling fold belt in Upper Yangtze Basin

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Global Geology 2014年第1期17卷 18-23页

作者： MIAO Qishi PAN Baozhi ZHAI Ting YANG Mingyu Logging Engineering Company East China Petroleum BureauSinopec College of Geo-Exploration of Science and Technology Jilin University

Factors of shale gas accumulation can be divided into the external and internal factors,according to accumulation mechanism and characteristics of shale gas. The internal factors mainly refer to parameters of organic geochemistry,mineral components and physical parameters. Six factors were presented in this study,i. *** matter,maturity,quartz,carbonate,clay mineral and pore. The external factors mainly refer to geologic environment of shale gas reservoir,including four factors: temperature,pressure,depth and *** on the experiment results of 26 samples of drilling cores from Wuling fold belt in Lower Paleozoic Silurian of the Upper Yangtze Basin,combined with the integrated analysis of geology,logging and test,the correlation of the gas content of shale gas to the above-mentioned ten factors was concluded. Six important evaluation indicators were preliminarily established in the gas-bearing core area of marine shale in the Upper Yangtze Basin.

关键词： shale gas gas content influencing factor marine shale Upper Yangtze Basin

Study on Hydraulic System Efficiency of Heaving-Buoy Wave Energy Converter

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Journal of Ocean University of China 2018年第5期17卷 1044-1052页

作者： SHI Hongda ZHAO Chenyu LIU Zhen CAO Feifei College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China

The hydraulic system is the key component in the widely used wave energy converters(WEC).In this paper,we theoretically analyze and describe our investigation of the efficiency of the hydraulic system by simulation and model testing of the combined heaving-buoy *** derive a new governing equation that includes nonlinear hydraulic resistance in the power take-off(PTO).We conducted a physical model experiment based on a 100-kW prototype and applied a hydraulic system with an energy *** model test results reveal an important parameter related to efficiency with respect to nonlinear hydraulic *** also studied the relationship between the efficiency and the initial ***,based on our numerical simulation results,we discuss the effect on efficiency of the gas content of the hydraulic fluid and ways to reduce its impact.

关键词： hydraulic system PTO nonlinear hydraulic resistance efficiency gas content

Degassing effect of ultrasonic vibration in molten melt and semi-solid slurry of Al-Si alloys

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China Foundry 2012年第3期9卷 201-206页

作者： Wu Shusen Liu Longfei Ma Qianqian Mao Youwu An Ping State Key Lab.of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

In the process of semi-solid slurry preparation with direct ultrasonic vibration (UV) by dipping the horn into the melt, one of the questions is whether the gas content in the melt would be increased or not by the cavitation effect of ultrasonic vibration. By application of quantitative gas content measurement technique, this paper investigated the effect of the ultrasonic vibration on the gas content of both the melt and the semi-solid slurry of Al-Si alloys, and the variations of the gas contents in two kinds of aluminum alloys, i.e., A356 alloy and Al-20Si-2Cu-1Ni-0.6RE alloy (Al-20Si for short). The results show that ultrasonic vibration has an obvious degassing effect on the molten melt, especially on the semi-solid slurry of Al-Si alloy which is below the liquidus temperature by less than 20 ℃. The ultrasonic degassing efficiency of the A356 alloy decreases with the reduction of the initial gas content in the melt, and it is nearly unchanged for the Al-20Si alloy. The gas content of both alloys decreases when the ultrasonic vibration time is increased. The best vibration time for Al-20Si alloy at the liquid temperature of 710 ℃ and semi-solid temperature of 680 ℃ is 60 s and 90 s, respectively; and the degassing efficiency is 48% and 35%, respectively. The mechanism of ultrasonic degassing effect is discussed.

关键词： ultrasonic vibration semi-solid slurry aluminum alloy gas content degassing

An experimental study on microscopic characteristics of gas-bearing sediments under different gas reservoir pressures

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Acta Oceanologica Sinica 2021年第10期40卷 144-151页

作者： Zhenqi Guo Tao Liu Lei Guo Xiuting Su Yan Zhang Sanpeng Li Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

gas-bearing sediments are widely distributed in five continents all over the *** of the gases exist in the soil skeleton in the form of discrete large *** existence of gas-phase may increase or decrease the strength of the soil *** far,bubbles’structural morphology and evolution characteristics in soil skeleton lack research,and the influence of different gas reservoir pressures on bubbles are still *** micro characteristics of bubbles in the same sediment sample were studied using an industrial CT scanning test system to solve these *** the image processing software,the micro variation characteristics of gas-bearing sediments in gas reservoir pressure change are *** results show that the number and volume of bubbles in different equivalent radius ranges will change regularly under different gas reservoir *** the increase of gas reservoir pressure,the number and volume of tiny bubbles *** contrast,the number and volume of large bubbles increase,and the gas content in different positions increases and occupies a dominant position,driving the reduction of pore water and soil skeleton movement.

关键词： micro characteristics CT scanning gas content number and volume of bubbles gas reservoir pressure seabed sediments

Determination of indices and critical values of gas parameters of the first gas outburst in a coal seam of the Xieqiao Mine

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International Journal of Mining Science and Technology 2012年第1期22卷 89-93页

作者： Ou Jianchun Liu Mingju Zhang Chunru Liu Yanwei Wei Jianping School of Safety Engineering Chino University of Mining&TechnologyXuzhou 221008China Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China Xieqiao Mine of Huainan Mining Industry Group Huainan 232001Chino

Based on the important role in mine safety played by parameters of the first gas outburst, we propose a method of combining historic data, theoretical analysis and experimental research for the purpose of crit- ical values of gas parameters of the first gas outburst in a coal seam of the Xieqiao Mine. According to a characteristic analysis and a summary of the rules of coal and gas outbursts in the No.8 coal seam of a Hua- inan mine, we have investigated their effect on coal and gas outbursts in terms such as ground stress, gas, and coal structure. We have selected gas parameters and determined the critical values of each of the fol- lowing indices： gas content as 7.7 m^3/t, tectonic coal as 0.8 m thick, the absolute gas emission as 2 m3/min, the rate of change as 0.7 m3/min, the gas desorption index of a drilling chip KI as 0.26 mL/（g min^1/2） and the values of desorption indexes Ah2 as 200 Pa. From a verification of the production, the results indicate that application of each index and their critical values significantly improve the level of safety in the pro- duction process, relieve the burden upon the mine, save much labor and bring clear economic benefits.

关键词： Parameters of first gas outburst gas content Thickness of tectonic coal Critical value Coal and gas outbursts