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[1]段正鹏,李志强,陈向军,等.多尺度煤粒与瓦斯多尺度动扩散系数模型特征参数关系研究[J].中国安全生产科学技术,2018,14(6):97-102.[doi:10.11731/j.issn.1673-193x.2018.06.015]
 DUAN Zhengpeng,LI Zhiqiang,CHEN Xiangjun,et al.Study on relationship between multiscale coal particles and characteristic parameters of gas multiscale dynamic diffusion coefficient model[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2018,14(6):97-102.[doi:10.11731/j.issn.1673-193x.2018.06.015]
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多尺度煤粒与瓦斯多尺度动扩散系数模型特征参数关系研究()
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
14
期数:
2018年6期
页码:
97-102
栏目:
职业安全卫生管理与技术
出版日期:
2018-06-30

文章信息/Info

Title:
Study on relationship between multiscale coal particles and characteristic parameters of gas multiscale dynamic diffusion coefficient model
文章编号:
1673-193X(2018)-06-0097-06
作者:
段正鹏12李志强345陈向军4成墙4李国红12
(1. 贵州省矿山安全科学研究院;2. 贵州省煤矿瓦斯防治工程技术研究中心;3.河南理工大学 中原经济区煤层(页岩气)河南省协同创新中心;4. 河南理工大学 煤矿灾害预防与抢险救灾教育部工程研究中心;5. 重庆大学 煤矿灾害动力学与控制国家重点实验室)
Author(s):
DUAN Zhengpeng12 LI Zhiqiang345 CHEN Xiangjun4 CHENG Qiang4 LI Guohong12
(1. Guizhou Provincial Research Institute of Mine Safety Science;2. Guizhou Provincial Engineering Technology Research Center for Coal Gas Prevention & Control;3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Province,Henan Polytechnic University;4. MOE Engineering Center of Mine Disaster Prevention and Rescue, Henan Polytechnic University;5. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University)
关键词:
多尺度粒径扩散模型动态扩散系数
Keywords:
multiscale particle size diffusion model dynamic diffusion coefficient
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2018.06.015
文献标志码:
A
摘要:
为研究煤基质尺度对瓦斯扩散运移能力的影响,在实验室内开展了0.18~0.25 mm,0.25~1 mm,1~3 mm,3~6 mm,6~10 mm等5种不同尺度煤粒在不同初始吸附平衡压力下的瓦斯扩散实验。基于多尺度动扩散系数新模型,研究了煤粒尺度与多尺度动扩散系数模型特征参数的关系。研究结果表明:新模型对全扩散过程的描述精度要好于经典模型,经典模型最大相对误差达18.4%,而新模型仅为3.9%;相同条件下,初始扩散系数D0值随着粒径的增大呈递增趋势,最大增大了45.3倍;扩散衰减系数β值随着粒径的增大呈递减趋势,最大衰减了89.8%。实验揭示了多尺度煤粒内的瓦斯多尺度扩散特征,大尺度煤粒包含了更大的外在孔隙,导致煤粒尺度越大,初始扩散系数D0值越大,但因大尺度孔隙占比较大,导致孔隙尺度级差变化较小,因而有较小的衰减系数β值;小尺度煤粒因具有较小的外在孔隙,其D0值较小,但因微小孔隙占比较大,且微小孔隙尺度级差变化较大,因而有较大的衰减系数β值。不同煤粒尺度的扩散特征参数D0和β值的这种变化特征反映了当前低渗煤层瓦斯抽采过程中初期抽采量大但衰减迅速的现象,也为瓦斯(煤层气)增产及稳产提供了储层改造方向。
Abstract:
To study the influence of coal matrix scale on the diffusion and migration capacity of gas, the gas diffusion experiments of coal particles with 5 different scales under different initial adsorption equilibrium pressures were carried out, including 0.18 mm-0.25 mm, 0.25 mm-1 mm, 1 mm-3 mm, 3 mm-6 mm and 6 mm-10 mm. Based on the new model of multiscale dynamic diffusion coefficient, the relationship between the scale of coal particles and the characteristic parameters of the multiscale dynamic diffusion coefficient model was studied. The results showed that the description accuracy of the new model for the whole diffusion process was better than that of the classical model, and the maximum relative error of the classical model was 18.4%, while that of the new model was only 3.9%. The initial diffusion coefficient D0 increased with the increase of particle size under the same conditions, and increased by 45.3 times to the maximum. The diffusion attenuation coefficient β decreased with the increase of particle size, and the maximum attenuation was 89.8%. The experiments revealed the multiscale diffusion characteristics of gas in the multiscale coal particles. The large scale coal particles contained larger external pores, which caused the larger the scale of coal particles, the larger the initial diffusion coefficient D0, but the large pores occupied a relatively large proportion, which caused a smaller variation of pore scale level difference, so there was a smaller attenuation coefficient β. The small scale coal particles had smaller external pores, and the D0 values were smaller. However, the small pores occupied a relatively large proportion, and the small pore scale level difference varied greatly, so there was a larger attenuation coefficient β. The variation characteristics of diffusion characteristic parameters D0 and β under different scales of coal particles reflected the phenomenon of large initial volume but rapid attenuation in the process of gas drainage in the low permeability coal seam at present, and it also provides the direction to the reservoir transformation for increasing production and stable production of gas (CBM).

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备注/Memo

备注/Memo:
国家自然科学基金项目(51004041,51204065);煤矿灾害动力学与控制国家重点实验室开放课题(2011DA105287-KF201313);长江学者和创新团队发展计划(PCSIRT1235);河南省高校科技创新团队支持计划(17IRTSTHN030)
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