Study on accuracy of coal seam gas pressure measurement based on its spatial and temporal distribution characteristics

doi:10.16265/j.cnki.issn 1003-3033.2021.02.006

Abstract

Abstract: In order to obtain reliable field measured results of coal seam gas pressure and realize scientific evaluation and precise prevention for coal seam outburst disasters, theoretical analysis, numerical simulation and field test were utilized to analyze spatial and temporal distribution of measure gas pressure based on gas flow model and gas pressure recovery curve with dual pore medium as object.Then engineering verification was carried out in No.10 coal seam in Taoyuan coalmine Ⅱ1 mining area.The results show that when matrix gas pressure and fracture gas pressure are in a dynamic balance, the measured results are the closest to real value. Accurate simulation of gas pressure spatial and temporal distribution could be realized by using gas flow equation of coal seam pressure measurement with COMSOL. When measured gas pressure recovery curve is consistent with simulated distribution regulation, and falls within engineering range of predictive values, it could be considered as real value. So the field measurement is accurate as it shows the recovery curve's consistency with simulated results.

Key words: gas pressure, recovery curve, spatial and temporal distribution, numerical simulation, pressure measurement

CLC Number:

X936

WANG Liang, SUN Yimin, CHU Peng, ZHAO Wei, ZOU Shuangying. Study on accuracy of coal seam gas pressure measurement based on its spatial and temporal distribution characteristics[J]. China Safety Science Journal, 2021, 31(2): 40-47.

References

[1] 张玉峰. 关于我国煤炭可持续发展的探讨[J]. 中国煤炭地质, 2018,30(增1): 60-63.
ZHANG Yufeng. Discussion on sustainable development of coal in China [J]. Coal Geology of China, 2018,30 (S1): 60-63.
[2] 国家统计局. 中华人民共和国2019年国民经济和社会发展统计公报[J].中国统计, 2020(3):8-22.
[3] 程远平. 煤矿瓦斯防治理论与工程应用[M]. 徐州:中国矿业大学出版社, 2011: 4-5.
CHENG Yuanping. Theories and engineering applications on coal mine gas control [M]. Xuzhou: China University of Mining and Technology Press, 2011: 4-5.
[4] 赵嵘, 齐黎明. 井下直接法测定煤层瓦斯压力研究现状及分析[J]. 煤炭技术, 2017,36(3): 202-203.
ZHAO Rong, QI Liming. Research status of direct method of gas pressure measurement in coal seam under mine and its analysis [J]. Coal Technology, 2017,36 (3): 202-203.
[5] 谢兴礼. 打开程度不完善井压力恢复曲线整理方法[J]. 石油勘探与开发, 1978 (4): 34-46.
XIE Xingli. Well pressure recovery curve adjustment method with imperfect opening degree [J]. Petroleum Exploration and Development, 1978 (4): 34-46.
[6] 王耀祖. 利用油井压力恢复曲线分析注水井注水强度变化及工作状况[J]. 石油勘探与开发, 1982 (2): 76-84.
WANG Yaozu. Analysis of water injection intensity changes and working conditions of injection wells using pressure recovery curve [J]. Petroleum Exploration and Development, 1982 (2): 76-84.
[7] 周守为. 利用压力恢复曲线确定双重介质地层油井的地质储量[J]. 石油勘探与开发, 1985 (5): 49-54.
ZHOU Shouwei. Using pressure recovery curve to determine the geological reserves of dual medium formation oil wells [J]. Petroleum Exploration and Development, 1985 (5): 49-54.
[8] 周世宁. 从钻孔瓦斯压力上升曲线计算煤层透气系数的方法:相似理论和电子计算机在矿井瓦斯领域中的应用[J]. 中国矿业学院学报, 1982 (3):8-15.
ZHOU Shining. Calculation of gas permeability coefficient of coal seams by means of the curve of rising gas pressure in boreholes[J].Journal of China University of Mining & Technology,1982 (3):8-15.
[9] 张占存. 基于压力恢复曲线理论的煤层瓦斯渗流参数测定方法及应用研究[D]. 沈阳:东北大学,2017.
ZHANG Zhancun. Study on the seepage parameters determination method and application of coal seam gas based on the pressure build up curves [D]. Shenyang:Northeastern University, 2017.
[10] 王国际, 岑培山, 田坤云, 等. 上倾角含水瓦斯压力测压孔压力恢复曲线分析[J]. 煤炭科学技术, 2010, 38(3): 52-54.
WANG Guoji, CEN Peishan, TIAN Kunyun, et al. Analysis on pressure recovery curve of water bearing gas pressure measuring borehole with upward inclination [J]. Coal Science and Technology, 2010,38(3): 52-54.
[11] 刘明举, 陈亮, 曾昭友. 基于压力恢复曲线的富水煤层瓦斯测压结果修正[J]. 煤炭科学技术, 2013,41(7): 67-70.
LIU Mingju, CHEN Liang, ZENG Zhaoyou. Correction on pressure measured results of watery seam gas based on pressure recovered curve [J]. Coal Science and Technology, 2013,41(7): 67-70.
[12] 程五一. 时间序列技术在预测瓦斯压力中的应用[J]. 煤矿工程师, 1994(2): 27-31.
[13] 赵嵘, 齐黎明, 王伟, 等. 井下直接法测定煤层瓦斯压力数值模拟[J]. 煤矿安全, 2017,48(2): 9-12.
ZHAO Rong, QI Liming, WANG Wei, et al. Numerical simulation of underground coal seam gas pressure measurement by direct method [J]. Safety in Coal Mines, 2017,48(2): 9-12.
[14] 张迎新, 孙浩. 基于ANSYS温度场的煤层瓦斯压力模拟可行性[J]. 黑龙江科技大学学报, 2013,23(4): 333-336.
ZHANG Yingxin, SUN Hao. Feasibility study of coal seam gas pressure simulation based on ANSYS temperature field [J]. Journal of Heilongjiang University of Science and Technology, 2013,23(4): 333-336.
[15] 齐黎明, 祁明, 陈学习. 抽采钻孔周围煤层瓦斯压力分布理论分析及应用[J]. 中国安全科学学报, 2018,28(7): 102-108.
QI Liming, QI Ming, CHEN Xuexi. Theoretical analysis of coal seam gas pressure distribution around drainage hole and its application [J]. China Safety Science Journal, 2018,28(7): 102-108.
[16] 李胜, 张浩浩, 范超军, 等. 考虑基质瓦斯渗流的煤层流固耦合模型[J]. 中国安全科学学报, 2018, 28(3): 114-119.
LI Sheng, ZHANG Haohao, FAN Chaojun, et al.A flow-solid coupling model considering matrix methane seepage for coal methane extraction[J]. China Safety Science Journal, 2018,28(3): 114-119.
[17] 魏国营, 娄振, 陶东东, 等. 钻孔瓦斯抽采气固耦合模型及其应用[J]. 中国安全科学学报, 2017,27(2): 75-80.
WEI Guoying, LOU Zhen, TAO Dongdong, et al. Solid-gas coupling model for gas drainage from boreholes and its application[J]. China Safety Science Journal, 2017,27(2): 75-80.
[18] LIU Qingquan, CHU Peng, ZHU Jintuo, et al. Numerical assessment of the critical factors in determining coal seam permeability based on the field data[J]. Journal of Natural Gas Science and Engineering, 2020,74: 103 098.
[19] 周世宁, 孙辑正. 煤层瓦斯流动理论及其应用[J]. 煤炭学报, 1965,2(1): 24-37.
[20] DONG Jun, CHENG Yuanping, JIN Kan, et al. Effects of diffusion and suction negative pressure on coalbed methane extraction and a new measure to increase the methane utilization rate[J]. Fuel, 2017,197(1): 70-81.
[21] AN Fenghua, CHENG Yuanping, WANG Liang, et al. A numerical model for outburst including the effect of adsorbed gas on coal deformation and mechanical properties[J]. Computers & Geotechnics, 2013,54(10): 222-231.
[22] AQ/T 1047—2007,煤矿井下煤层瓦斯压力的直接测定方法[S].
AQ/T 1047-2007,The direct measuring method of the coal seam gas pressure in mine[S].
[23] WANG Liang, CHENG Yuanping, WANG Lei, et al. Safety line method for the prediction of deep coal-seam gas pressure and its application in coal mines[J]. Safety Science, 2012,50(3): 523-529.
[24] LIU Qingquan, CHU Peng, HAO Congmeng, et al. Non-uniform distributions of gas pressure and coal permeability in coalbed methane reservoirs induced by the loess plateau geomorphology: a case study in ordos basin China[J]. Natural Resources Research, 2019,29(6): 1-17.