Resistivity detection and its application in underground coal mine directional boreholes

Authors

LI Bofan, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, ChinaFollow
LIU Lei, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
FAN Tao, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
JIANG Qiping, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
WANG Jie, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China

Abstract

The working face threatened by high gas or Ordovician limestone water pressure generally adopts directional drilling technology to carry out fracturing or grouting works at the bottom of the working face before mining to ensure the safety of mining. In-hole probing in directional boreholes in the bottom plate can reveal the hidden structures in the working face in a more detailed way, and can also realize “one hole for multiple uses”. In order to solve the detection problem in the directional drilling, a method of DC resistivity detection in the horizontal directional drilling is proposed. To solve the problem of detection in directional hole, a method of direct current detection in horizontal directional drilling is proposed. After the completion of directional drilling, exit the cable drill pipe of directional drilling and send it into the inner flat drill pipe. Sent the high-density cable of the hole into the drill hole through the special water supply device at the end of the drill pipe, so that the cable in the hole is laid flat in the drill hole. Through numerical simulation, the attenuation law of the received signal, the variation characteristics of the apparent resistivity curve, and the influence of roof and floor lithology on the measurement results of the working mode of single-hole measurement in layered media are studied, and the anomaly range near the hole is inverted by using the single-hole measurement data. In the horizontal section of the directional drilling, radial detection by direct current method in the hole is carried out. Numerical simulation results show that the resistivity detection method is effective in detecting concealed abnormal bodies. Through the actual coal seam floor detection test in a mine in Hancheng, Shaanxi Province, the data processing results of two directional extraction boreholes in the study area show that the anomaly area of inversion is consistent with the location of hidden small faults in the working face; the feasibility of cable arrangement in directional borehole and the reliability of radial/perspective detection of concealed structure in directional borehole are verified.

Keywords

directional drilling, cable in hole, radial detection, borehole resistivity detection, resistivity perspective

DOI

10.12363/issn.1001-1986.21.11.0688

Recommended Citation

LI Bofan, LIU Lei, FAN Tao, et al. (2022) "Resistivity detection and its application in underground coal mine directional boreholes," Coal Geology & Exploration: Vol. 50: Iss. 1, Article 9.
DOI: 10.12363/issn.1001-1986.21.11.0688
Available at: https://cge.researchcommons.org/journal/vol50/iss1/9

Reference

[1] 吴荣新,张平松,刘盛东,等. 矿井工作面无线电波透视“一发双收”探测与应用[J]. 煤炭学报,2010,35(增刊1):170−174. WU Rongxin,ZHANG Pingsong,LIU Shengdong,et al. Radio wave penetration by the device of one−transmitter and two−receivers for coal face and its application[J]. Journal of China Coal Society,2010,35(Sup.1):170−174.

[2] 姬广忠,程建远,胡继武,等. 槽波衰减系数成像方法及其应用[J]. 煤炭学报,2014,39(增刊2):471−475. JI Guangzhong,CHENG Jianyuan,HU Jiwu,et al. In−seam wave imaging using attenuation coefficient:Method and application[J]. Journal of China Coal Society,2014,39(Sup.2):471−475.

[3] 高致宏,王彦红,陈青峰. 工作面富水区探测与矿井电法: 音频电透视在工作面富水区探测中的应用效果[J]. 煤田地质与勘探,2002,30(4):51−54. GAO Zhihong,WANG Yanhong,CHEN Qingfeng. Surveying the water–full situation in work face and mine electric method:An application example using electric audio−clarivoyant method[J]. Coal Geology & Exploration,2002,30(4):51−54.

[4] 韩德品,李丹,程九龙,等. 超前探测灾害性含导水地质构造的直流电法[J]. 煤炭学报,2010,35(4):635−639. HAN Depin,LI Dan,CHENG Jiulong,et al. DC method of advanced detecting disastrous water conducting or water bearing geological structures along same layer[J]. Journal of China Coal Society,2010,35(4):635−639.

[5] 李术才,苏茂鑫,薛翊国,等. 城市地铁跨孔电阻率CT超前地质预报方法研究[J]. 岩石力学与工程学报,2014,33(5):913−920. LI Shucai,SU Maoxin,XUE Yiguo,et al. Study on computed tomography of cross–hole resistivity in urban subway geological prediction[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(5):913−920.

[6] 刘征宇,李术才,刘斌,等. 用于地铁盾构区间孤石探测的三维电阻率跨孔CT方法研究及物理模型试验[J]. 岩石力学与工程学报,2015,34(12):2519−2530. LIU Zhengyu,LI Shucai,LIU Bin,et al. Boulder detection method based on 3D resistivity cross–hole tomography in metro shield zones and its physical model experimental study[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(12):2519−2530.

[7] 张平松,刘盛东,吴荣新,等. 采煤面覆岩变形与破坏立体电法动态测试[J]. 岩石力学与工程学报,2009,28(9):1870−1875. ZHANG Pingsong,LIU Shengdong,WU Rongxin,et al. Dynamic detection of overburden deformation and failure in mining workface by 3D resistivity method[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(9):1870−1875.

[8] 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.

[9] 李彬刚. 芦岭煤矿碎软低渗煤层高效抽采技术[J]. 煤田地质与勘探,2017,45(4):81−84. LI Bingang. Technology of CBM extraction in the crushed and soft coal seam in Luling coal mine[J]. Coal Geology & Exploration,2017,45(4):81−84.

[10] 赵庆彪. 奥灰岩溶水害区域超前治理技术研究及应用[J]. 煤炭学报,2014,39(6):1112−1117. ZHAO Qingbiao. Ordovician limestone karst water disaster regional advanced governance technology study and application[J]. Journal of China Coal Society,2014,39(6):1112−1117.

[11] 赵兵文,关永强. 大采深矿井高承压奥灰岩溶水综合治理技术[J]. 煤炭科学技术,2013,41(9):75−78. ZHAO Bingwen,GUAN Yongqiang. Comprehensive treatment technology of high pressure–bearing Ordovician limestone karst water in large mining depth mine[J]. Coal Science and Technology,2013,41(9):75−78.

[12] 阮百尧,熊彬. 电导率连续变化的三维电阻率测深有限元模拟[J]. 地球物理学报,2002,45(1):131−138. RUAN Baiyao,XIONG Bin. A finite element modeling of three−dimensional resistivity sounding with continuous conductivity[J]. Chinese Journal of Geophysics,2002,45(1):131−138.

[13] 黄俊革,王家林,阮百尧. 坑道直流电阻率法超前探测研究[J]. 地球物理学报,2006,49(5):1529−1538. HUANG Junge,WANG Jialin,RUAN Baiyao. A study on advanced detection using DC resistivity method in tunnel[J]. Chinese Journal of Geophysics,2006,49(5):1529−1538.

[14] 黄俊革,阮百尧,王家林. 坑道直流电阻率法超前探测的快速反演[J]. 地球物理学报,2007,50(2):619−624. HUANG Junge,RUAN Baiyao,WANG Jialin. The fast inversion for advanced detection using DC resistivity in tunnel[J]. Chinese Journal of Geophysics,2007,50(2):619−624.

[15] 曹权,项伟,贾海梁,等. 跨孔超高密度电阻率法在球状风化花岗岩体探测中的应用[J]. 工程地质学报,2013,21(5):730−735. CAO Quan,XIANG Wei,JIA Hailiang,et al. Application of cross−hole ultra−density resistivity method to detection of spherically weathered granite[J]. Journal of Engineering Geology,2013,21(5):730−735.

[16] 王刚,周启友,吴世艳,等. 二维孔间电阻率成像中钻孔效应[J]. 地球物理学进展,2011,26(1):311−319. WANG Gang,ZHOU Qiyou,WU Shiyan,et al. Borehole effects of two dimensional cross−borehole ERT[J]. Progress in Geophysics,2011,26(1):311−319.