•  
  •  
 

Coal Geology & Exploration

Abstract

The pre-mining gas governance mode in Baode coal mine requires that long directional borehole of more than 3 000 m can be drilled along coal seam. In view of the existing technology and equipment, there are technical problems in the construction of ultra-long directional borehole, such as the difficulty of sliding drilling, the large hydraulic pressure consumption in inlet waterway, the limited transmission distance of wireline MWD signal, and incapability of flushing liquid recycle. The technology of friction reduction in sliding drilling based on the hydraulic thrust of DHM and the torsion penetration of the ultra-long drilling tool, the technology of trajectory control with compound drilling based on angle control with rotary drilling and branch drilling are developed. The system of low-pressure water consumption, mud pulse wireless MWD and purification circulatory for flushing fluid are designed. Combined with the production needs of Baode coal mine, an ultra-long in-seam directional borehole through mining face with the depth of 3 353 m and the borehole diameter of 120 mm was completed. The drilling results show that the friction reduction technology of sliding drilling effectively reduces the sliding penetration pressure and improves the ability of deep borehole with sliding drilling markedly; the technology of trajectory control based on compound drilling can control the borehole trajectory effectively, which ensures the borehole along the coal seam, and improves the drilling capacity and efficiency; the signal transmission of mud pulse wireless MWD system is stable and reliable, which overcomes the limitation of signal long-distance transmission by wireline MWD system; the purification circulatory system for flushing fluid has good cleaning effect, which realizes the circulation of flushing fluid in directional drilling. The research results are of great significance to support the advance control of gas in large area of coal mine, the engineering of replacing tunnel with borehole, the prevention and control of water disaster and the geological exploration.

Keywords

in-seam, ultra-long directional borehole, in-borehole friction reduction technology, compound drilling, side-tracking branch well, mud pulse, purification circulatory system for flushing liquid

DOI

10.3969/j.issn.1001-1986.2019.06.001

Reference

[1] 石智军,姚克,田宏亮,等. 煤矿井下随钻测量定向钻进技术与装备现状及展望[J]. 煤炭科学技术,2019,47(5):22-28. SHI Zhijun,YAO Ke,TIAN Hongliang,et al. Present situation and prospect of directional drilling technology and equipment while drilling measurement in underground coal mine[J]. Coal Science and Technology,2019,47(5):22-28.

[2] 李泉新,石智军,田宏亮,等. 我国煤矿区钻探技术装备研究进展[J]. 煤田地质与勘探,2019,47(2):1-6. LI Quanxin,SHI Zhijun,TIAN Hongliang,et al. Progress in the research on drilling technology and equipment in coal mining areas of China[J]. Coal Geology & Exploration,2019,47(2):1-6.

[3] 刘飞,许超,王鲜,等. 顺煤层超长定向钻孔钻压传递规律研究[J]. 工矿自动化,2019,45(8):97-100. LIU Fei,XU Chao,WANG Xian,et al. Research of weight on bit transmission law of ultra-long directional borehole along coal seam[J]. Industry and Mine Automation,2019,45(8):97-100.

[4] 石智军,许超,李泉新,等. 煤矿井下2570 m顺煤层超深定向孔高效成孔关键技术[J/OL]. 煤炭科学技术,(2019-10-31)[2019-11-11]. http://kns.cnki.net/kcms/detail/11.2402.td.20191031.1541.002.html. SHI Zhijun,XU Chao,LI Quanxin,et al. Key technologies for making 2570 m ultra-deep directional borehole effectively along the coal seam in coal mine[J]. Coal Science and Technology,(2019-10-31)[2019-11-11]. http://kns.cnki.net/kcms/detail/11.2402.td.20191031.1541.002.html.

[5] 李泉新,石智军,许超,等. 2311 m顺煤层超长定向钻孔高效钻进技术[J]. 煤炭科学技术,2018,46(4):27-32. LI Quanxin,SHI Zhijun,XU Chao,et al. Efficient drilling technique of 2311 m ultra-long directional borehole along coal seam[J]. Coal Science and Technology,2018,46(4):27-32.

[6] 苏义脑,谢竹庄. 螺杆钻具和多头单螺杆马达的基本原理[J]. 石油钻采机械,1985,13(4):1-10. SU Yinao,XIE Zhuzhuang. Basic principle of screw drill and multi-head single screw motor[J]. Drilling & Production Equipment,1985,13(4):1-10.

[7] 谢竹庄. 螺杆钻具推力轴承的载荷研究[J],石油机械,1993,21(3):26-31. XIE Zhuzhuang. Study on thrust bearing load of screw drill[J]. China Petroleum Machinery,1993,21(3):26-31.

[8] 易先中,李智鹏,周元华,等. 地面钻柱扭摆方法释放井下摩阻的研究进展[J]. 钻采工艺,2014,37(4):73-76. YI Xianzhong,LI Zhipeng,ZHOU Yuanhua,et al. Research advances on releasing drill string friction effect by surface drill string oscillation method[J]. Drilling & Production Technology,2014,37(4):73-76.

[9] 李智鹏,许京国,陶瑞东,等. 扭矩摇摆技术研究现状[J]. 钻采工艺,2016,39(6):28-30. LI Zhipeng,XU Jingguo,TAO Ruidong,et al. Study on torque rocking technology[J]. Drilling & Production Technology,2016,39(6):28-30.

[10] 韩烈祥. 基于静摩擦扭矩释放的快速滑动定向钻井技术[J]. 天然气工业,2015,35(11):60-65. HAN Liexiang. A quick slide directional drilling technology based on static friction torque release[J]. Natural Gas Industry,2015,35(11):60-65.

[11] 许超. 煤矿井下复合定向钻进技术优势探讨[J]. 金属矿山,2014,43(2):112-116. XU Chao. Discussion on superiority of compound directional drilling technology in underground coal mine[J]. Metal Mine,2014,43(2):112-116.

[12] 刘建林,李泉新. 基于轨迹控制的煤矿井下复合定向钻进工艺[J]. 煤矿安全,2017,48(2):78-81. LIU Jianlin,LI Quanxin. Composite directional drilling technology for underground coal mine based on trajectory control[J]. Safety in Coal Mines,2017,48(2):78-81.

[13] 石智军,胡少韵,姚宁平,等. 煤矿井下瓦斯抽采(放)钻孔施工新技术[M]. 北京:地质出版社,2008. SHI Zhijun,HU Shaoyun,YAO Ningping,et al. New technology of gas drainage and drilling in coal mine[M]. Beijing:Geological Press,2008.

[14] 王传留,居培,高晓亮. 煤矿井下定向钻进用新型PDC钻头[J]. 金刚石与磨料磨具工程,2016(6):74-78. WANG Chuanliu,JU Pei,GAO Xiaoliang. Research on new type of directional drilling PDC bit used in coal mine drill[J]. Diamond & Abrasives Engineering,2016(6),74-78.

[15] 高晓亮,王传留,田宏杰.大直径定向长钻孔用PDC钻头设计与应用[J]. 煤炭工程,2018,50(5):150-152. GAO Xiaoliang,WANG Chuanliu,TIAN Hongjie. Design and application of PDC bit for major diameter directional long drilling hole[J]. Coal Engineering,2018,50(5):150-152.

[16] 许超,李泉新,刘建林,等. 煤矿瓦斯抽采定向长钻孔高效成孔工艺研究[J]. 金属矿山,2011(6):39-55. XU Chao,LI Quanxin,LIU Jianlin,et al. Research on high efficient long directional drilling process for gas drainage in coal mine[J]. Metal Mine,2011(6):39-55.

[17] 李泉新. 矿用泥浆脉冲无线随钻测量装置研发及应用[J]. 煤田地质与勘探,2018,46(6):193-197. LI Quanxin. Development and application of mine mud pulse wireless MWD device[J]. Coal Geology & Exploration,2018,46(6):193-197.

[18] 李泉新. 煤矿井下复合定向钻进及配套泥浆脉冲无线随钻测量技术研究[D]. 北京:煤炭科学研究总院,2018. LI Quanxin. Research on technology of drilling combined rotary with direction and related mud pulse MWD[D]. Beijing:China Coal Research Institute,2018.

[19] 方俊,谷拴成,石智军,等. 矿用泥浆脉冲无线随钻测量装置及其应用[J]. 工矿自动化,2019,45(2):12-17. FANG Jun,GU Shuancheng,SHI Zhijun,et al. Mine-used mud pulse wireless measurement while drilling device and its application[J]. Industry and Mine Automation,2019,45(2):12-17.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.