Application of controllable electric pulse wave permeability-enhancing technology in the low-permeability coal seams

Authors

AN Shigang, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China
CHEN Dianfu, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China
ZHANG Yongmin, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
KONG Delei, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China
LI Yang, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China
ZHANG Di, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China
WANG Yang, Shenhua Shendong Coal Group Co. Ltd., Yulin 719315, China

Abstract

Controllable electric pulse wave permeability-enhancing technology is one of the ideal measures for anti-reflection transformation of low-permeability coal seams. The optimization of construction schemes needs to be solved urgently. Aiming at this problem, in the low-permeability coal seam of Baode coal mine, controllable electric pulse wave permeability-enhancing technology was adopted to optimize the permeability-enhancing construction scheme of the boreholes. Test results show that the controllable electric pulse wave permeability-enhancing effect is the best under the condition of the average permeability-enhancing section of 131 m, the impact density of 0.5 times/m and the average daily extraction volume in an anti-reflection borehole group is 4.7 times higher than that of the permeability-enhancing hole group. The daily average drainage volume of the permeability-enhancing borehole group is 5 m observation hole, 15 m observation hole, 30 m observation hole and antireflection hole in order from high to low, the influence radius is greater than 30 m. Comprehensive analysis based on comparative verification tests shows that the controllable electric pulse wave can significantly increase the gas drainage of the coal seams, and the impact density and the range of the permeability-enhancing operation in the boreholes are the important influencing factors to improve the permeability-enhancing effect. In harder coal seams the best permeability-enhancing effect is under condition of an average permeability-enhancing range of 100 m and an impact density of 0.5 times/m. The research results provide a reference for the design of operation scheme of the controllable electric pulse wave permeability-enhancing technology in China's low-permeability coal seams.

Keywords

controllable electric pulse wave, permeability-enhancing test, gas drainage, low-permeability coal seam, Baode coal mine

DOI

10.3969/j.issn.1001-1986.2020.04.020

Recommended Citation

AN Shigang, CHEN Dianfu, ZHANG Yongmin, et al. (2020) "Application of controllable electric pulse wave permeability-enhancing technology in the low-permeability coal seams," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 21.
DOI: 10.3969/j.issn.1001-1986.2020.04.020
Available at: https://cge.researchcommons.org/journal/vol48/iss4/21

Reference

[1] 张群,葛春贵,李伟,等. 碎软低渗煤层顶板水平井分段压裂煤层气高效抽采模式[J]. 煤炭学报,2018,43(1):150-159. ZHANG Qun,GE Chungui,LI Wei,et al.A new model and application of coalbed methane high efficiency production from broken soft and low permeable coal seam by roof strata-in horizontal well and staged hydraulic fracture[J]. Journal of China Coal Society,2018,43(1):150-159.

[2] 马会腾,翟成,徐吉钊,等. 基于NMR技术的超声波频率对煤体激励致裂效果的影响[J]. 煤田地质与勘探,2019,47(4):38-44. MA Huiteng,ZHAI Cheng,XU Jizhao,et al. Effect of NMR technology-based ultrasonic frequency on stimulated cracking of coal[J]. Coal Geology & Exploration,2019,47(4):38-44.

[3] 王建利,陈冬冬,贾秉义. 韩城矿区碎软煤层顶板梳状孔水力压裂瓦斯抽采工程实践[J]. 煤田地质与勘探,2018,46(4):17-21 WANG Jianli,CHEN Dongdong,JIA Bingyi. Practice of gas drainage by hydraulic fracturing of roof pectination boreholes in broken soft coal seam in Hancheng mining area[J]. Coal Geology & Exploration,2018,46(4):17-21.

[4] 闫志铭. 低透煤层井下长钻孔水力压裂增透技术[J]. 煤田地质与勘探,2017,45(3):45-48. YAN Zhiming. Hydraulic fracturing technology for permeability improvement through underground long borehole along coal seam[J]. Coal Geology & Exploration,2017,45(3):45-48.

[5] 武杰,田永东. 高聚能电脉冲技术在沁水盆地煤层气井的应用[J]. 煤田地质与勘探,2018,46(5):206-211. WU Jie,TIAN Yongdong. Application of high energy electric pulse technology in coalbed methane wells in Qinshui basin[J]. Coal Geology & Exploration,2018,46(5):206-211.

[6] 汪长栓,姚元文,冯国富,等. 脉冲爆燃压裂技术在煤层气井中的应用[J]. 钻采工艺,2013,36(2):128-130. WANG Changshuan,YAO Yuanwen,FENG Guofu,et al. Application of pulse deflagration fracturing technology in coalbed methane[J]. Drilling & Production Technology,2013,36(2):128-130.

[7] 牛庆合,曹丽文,周效志. CO₂注入对煤储层应力应变与渗透率影响的实验研究[J]. 煤田地质与勘探,2018,46(5):43-48. NIU Qinghe,CAO Liwen,ZHOU Xiaozhi. Experimental study of the influences of CO₂ injection on stress-strain and permeability of coal reservoir[J]. Coal Geology & Exploration,2018,46(5):43-48.

[8] 孙四清,郑凯歌. 井下高压水射流切割煤层增透效果数值模拟[J]. 煤田地质与勘探,2017,45(2):45-49. SUN Siqing,ZHENG Kaige. Numerical simulation study on permeability enhancement effect of high pressure water cutting coal seam[J]. Coal Geology & Exploration,2017,45(2):45-49.

[9] 徐晓乾,孟应芳,段正鹏,等. 贵州省煤层气(瓦斯)开发适用性技术分析[J]. 煤田地质与勘探,2019,47(6):8-13. XU Xiaoqian,MENG Yingfang,DUAN Zhengpeng,et al. Analysis of suitable development technology of CBM(gas) in Guizhou[J]. Coal Geology & Exploration,2019,47(6):8-13.

[10] 于文龙. 煤岩渗透率与有效应力耦合关系及控制机理[J]. 煤矿安全,2018,49(8):10-14. YU Wenlong. Coupling relationship and control mechanism between coal permeability and effective stress[J]. Safety in Coal Mines,2018,49(8):10-14.

[11] 李波,孙东辉,魏建平,等. 孔隙压力梯度对煤的渗透性影响实验[J]. 煤田地质与勘探,2018,46(1):35-40. LI Bo,SUN Donghui,WEI Jianping,et al. Experimental study on the effect of gas pressure gradient on coal permeability[J]. Coal Geology &Exploration,2018,46(1):35-40.

[12] 石智军,董书宁,杨俊哲,等. 煤矿井下3000 m顺煤层定向钻孔钻进关键技术[J]. 煤田地质与勘探,2019,47(6):1-7. SHI Zhijun,DONG Shuning,YANG Junzhe,et al. Key technology of drilling in-seam directional borehole of 3000 m in underground coal mine[J]. Coal Geology & Exploration,2019,47(6):1-7.

[13] 袁梅,何明华,王珍,等. 坚固性系数对含瓦斯煤渗透率影响的实验研究[J]. 矿业研究与开发,2012,32(3):39-42. YUAN Mei,HE Minghua,WANG Zhen,et al. Experimental study of the influence of solidity coefficient on permeability of coal containing gas[J]. Mining Research and Development,2012,32(3):39-42.

[14] 郭平. 滑脱效应和基质变形对低渗透煤体渗流特性影响的试验研究[J]. 煤矿安全,2016,47(7):9-13. GUO Ping. Experimental study on influence of slippage effect and matrix deformation on gas seepage characteristics of low permeability coal[J]. Safety in Coal Mines,2016,47(7):9-13.

[15] 曹树刚,郭平,李勇,等. 瓦斯压力对原煤渗透特性的影响[J]. 煤炭学报,2010,35(4):595-599. CAO Shugang,GUO Ping,LI Yong,et al. Effect of gas pressure on gas seepage of outburst coal[J]. Journal of China Coal Society,2010,35(4):595-599.

[16] 张永民,蒙祖智,秦勇,等. 松软煤层可控冲击波增透瓦斯抽采创新实践:以贵州水城矿区中井煤矿为例[J]. 煤炭学报,2019,44(8):2388-2400. ZHANG Yongmin,MENG Zuzhi,QIN Yong,et al. Innovative engineering practice of soft coal seam permeability enhancement by controllable shock wave for mine gas extraction:A case of Zhongjing mine,Shuicheng,Guizhou Province,China[J]. Journal of China Coal Society,2019,44(8):2388-2400.

[17] 张永民,安世岗,陈殿赋,等. 可控冲击波增透保德煤矿8号煤层的先导性试验[J]. 煤矿安全,2019,50(10):14-17. ZHANG Yongmin,AN Shigang,CHEN Dianfu,et al. Preliminary tests of coal reservoir permeability enhancement by controllable shock waves in Baode coal mine 8^# coal seam[J]. Safety in Coal Mines,2019,50(10):14-17.

[18] 秦勇,邱爱慈,张永民,等. 高聚能重复脉冲强冲击波煤层增渗新技术基础[R]. 徐州:中国矿业大学,2018. QIN Yong,QIU Aici,ZHANG Yongmin,et al. A new technology basis for high-energy and repetitive pulse strong shock wave for coal seam infiltration[R]. Xuzhou:China University of Mining & Technology,2018.

[19] 卢红奇. 高压电脉冲对煤体致裂作用实验研究[D]. 北京:中国矿业大学(北京),2015. LU Hongqi. Experimental research on fracturing coal with high-voltage electrical pulse[D]. Beijing:China University of Mining & Technology(Beijing),2015.

[20] 张永民,邱爱慈,周海滨,等. 面向化石能源开发的电爆炸冲击波技术研究进展[J]. 高压电技术,2016,42(4):1009-1017. ZHANG Yongmin,QIU Aici,ZHOU Haibin,et al. Research progress in electrical explosion shockwave technology for developing fossil energy[J]. High Voltage Engineering,2016,42(4):1009-1017.