碎软煤层空气定向钻进工艺最小供风流量

孙利海

碎软煤层空气定向钻进工艺最小供风流量

孙利海

计量
- 文章访问数: 36
- HTML全文浏览量: 0
- PDF下载量: 15
出版历程
- 发布日期: 2021-07-19

Minimum wind flow of air directional drilling technology in soft-fragmentized coal seam

SUN Lihai

摘要

摘要: 为解决碎软煤层空气定向钻进工艺关键参数最小供风量的选取范围较难确定的问题，对空气钻进岩屑受力情况进行分析，计算不同粒径不同倾角情况下岩屑临界起动速度，最小供风流量；通过数值分析手段对空气流速在钻孔中的分布和变化情况进行分析。结果表明：当钻孔倾角为-30°左右时，岩屑的临界起动流速最大；在不同钻孔倾角、不同粒径情况下，岩屑携岩起动的临界流速和最小供风流量的变化趋势一致；在径向上，空气流速在环空截面中心处最大，向两边孔壁、钻杆外壁或钻头壁以及钻杆内壁逐渐减小；在轴向上，从孔口至孔底空气流速逐渐增大，在孔底形成明显的高低流速分区，空气流经钻头与钻杆连接处时，产生突扩效应，使空气速度突然减小，形成明显高低速层流区，随后在钻杆与孔壁间环状间隙空气流速趋于稳定。
- 碎软煤层 /
- 空气定向钻进 /
- 供风流量 /
- 临界流速 /
- 钻孔倾角
Abstract: In order to solve the problem that it is difficult to determine the range of the minimum wind flow of air directional drilling technology in soft-fragmentized coal seam, in this paper, loading of cuttings in air drilling is analyzed, and the critical incipient velocity of cuttings and the minimum wind flow under different grain sizes and different dip angles is calculated, and the distribution and variation of air flow rate in the borehole are analyzed by numerical method. The results show that the critical starting velocity of cuttings is maximum when the inclination of the borehole is about minus 30°, and the critical starting velocity of cuttings carrying rock is consistent with the minimum air flow rate under the conditions of different inclination angles and different grain sizes. In the radial direction, the air velocity is the largest at the center of the annulus section, and gradually decreases toward the wall of the hole on both sides and the wall of the drill pipe or the wall of the drill pipe and the inner wall of the drill pipe. In the axial direction, the air velocity increases gradually from the hole mouth to the bottom of the hole, and an obvious high-low velocity zone is formed at the bottom of the hole. When the air flows through the joint of the drill bit and the drill pipe, a sudden expansion effect is produced, which causes the air velocity to suddenly decrease, forming a obviously high-low velocity laminar flow zone, subsequently, the air velocity in the annular gap between the drill pipe and the hole wall tends to be stable.
- soft-fragmentized coal seam /
- air directional drilling /
- wind flow /
- starting velocity /
- dip angle of borehole

HTML全文

参考文献(24)

[1]	黄小波．高压水射流煤层割缝技术关键参数优化[D]．重庆：重庆大学，2012.
[2]	张杰，王毅，黄寒静，等．空气螺杆马达软煤定向成孔技术研究[J]．煤炭科学技术，2018，46（11）：114－118. ZHANG Jie, WANG Yi, HUANG Hanjing, et al. Research on directional drilling technology of air srew motor in soft coal seam[J]. Coal Science and Technology, 2018, 46（11）: 114-118.
[3]	刘飞，梁道富，刘建林，等．碎软煤层空气复合定向钻进工艺技术[J]．煤矿安全，2019，50（7）：116－119. LIU Fei, LIANG Daofu, LIU Jianlin, et al. Air compound directional drilling technology in broken soft seam[J]. Safety in Coal Mines, 2019, 50（7）: 116-119.
[4]	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.
[5]	方俊，刘飞，李泉新，等．煤矿井下碎软煤层空气复合定向钻进技术与装备[J]．煤炭科学技术，2019，47（2）：224－229. FANG Jun, LIU Fei, LI Quanxin, et al. Air compound directional drilling technology and equipment for soft-fragmentized seam underground coal mine[J]. Coal Science and Technology, 2019, 47（2）: 224-229.
[6]	牟全斌．基于地质分析的三软煤层瓦斯突出防治研究[J]．煤炭技术，2014，33（12）：173－176. MOU Quanbin. Ｒesearch on prevention countermeasures of coal and gas outburst for three-soft coal seam based on geological analysis[J]. Coal Technology, 2014, 33（12）: 173-176.
[7]	汪凯斌．ＹＳDＣ矿用电磁波随钻测量系统及在煤矿井下空气钻进中的应用[J]．煤炭安全，2019，50（7）：153－156. WANG Kaibin. YSDC Mine-used electromagnetic wave measurement while drilling system and its application in air drilling for soft coal seam[J]. Safety in Coal Mines, 2019, 50（7）: 153-156.
[8]	孙荣军，李泉新，方俊，等．采空区瓦斯抽采高位钻孔施工技术及发展趋势[J]．煤炭科学技术，2017，45（1）：94－99. SUN Rongjun, LI Quanxin, FANG Jun, et al. Construction technology and development tendency of high level borehole for gas drainage in goaf[J]. Coal Science and Technology, 2017, 45（1）: 94-99.
[9]	刘爽．井下定向钻孔技术在红柳煤矿顶板水害防治中的应用研究[D]．西安：西安科技大学，2017.
[10]	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.
[11]	李泉新．碎软煤层复合定向钻进技术研究与应用[J]．煤炭科学技术，2018，46（11）：101－106. LI Quanxin. Research and application of drilling technology combined rotary with direction in sof-fragmentized coal seam[J]. Coal Science and Technology, 2018, 46（11）: 101-106.
[12]	刘飞，方俊，褚志伟，等．空气螺杆钻具在碎软煤层定向钻进中的应用分析[J]．矿业研究与开发，2019，39（8）：9－132. LIU Fei, FANG Jun, CHU Zhiwei, et al. Application analysis on air screw drill in direction drilling of broken soft coal seam[J]. Mining Research and Development, 2019, 39（8）: 129-132.
[13]	任海慧，李泉新，方俊．顶板高位定向钻孔无线随钻测量定向钻进技术及应用[J]．煤矿安全，2018，49（9）：110. REN Haihui, LI Quanxin, FANG Jun. Technology and application of directional drilling with mud pulse measurement with drilling in high level directional drilling of roof[J]. Safety in Coal Mines, 2018, 49（9）: 110.
[14]	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（7）：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（7）: 78-81.
[15]	石浩．大直径高位定向长钻孔瓦斯抽采技术及应用[J]．煤炭科学技术，2018，46（10）：190. SHI Hao. Gas drainage technology and its application of large diameter and high directional long drilling[J]. Coal Science and Technology, 2018, 46（10）: 190.
[16]	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.
[17]	冯达晖．煤矿井下精准对穿巷道疏放水孔定向成孔技术研究[J]．探矿工程（岩土钻掘工程），2018，45（3）：33－36. FENG Dahui. Research on directional hole-foaming technology of drainage hole for accurate targeting underground coal mine[J]. Exploration Engineering（Rock ＆ Soil Drilling and Tunneling）, 2018, 45（3）: 33-36.
[18]	韩春雨，龙刚，纪海鹏．气体钻井岩屑颗粒动力学分析[J]．重庆科技学院学报（自然科学版），2008，10（6）：31－39. HAN Chunyu, LONG Gang, JI Haipeng. Dynamics analysis of cutting on gas drilling[J]. Journal of Chongqing University of Science and Technology, 2008, 10（6）: 31-39.
[19]	张芬娜，李明忠，綦耀光，等．煤层气排采产气通道适度携煤粉理论[J]．中国石油大学学报（自然科学版），2015，39（2）：86－92. ZHANG Fenna, LI Mingzhong, QI Yaoguang, et al. Analysis of pulverized coal migration during CBM production[J]. Journal of China University of Petroleum（Edition of Natural Science）, 2015, 39（2）: 86-92.
[20]	邵帅，孟庆双，孙晓峰，等．非直井气体钻井岩屑起动的临界流速[J]．断块油气田，2013，20（6）：803－805. SHAO Shuai, MENG Qingshuang, SUN Xiaofeng, et al. Starting velocity of cutting particles in gas drilling of horizontal or highly deviated well[J]. Fault-Block Oil & Gas Field, 2013, 20（6）: 803-805.
[21]	王兴奎，杨铁笙，任裕民，等．床面颗粒受力的脉动特性[J]．水动力学研究与进展，1993，8（4）：404－412. WANG Xingkui, YANG Tiesheng, REN Yumin, et al. The fluctuating characteristics of hydrodynamic forces on bed particle[J]. Journal of Hydrodynamics, 1993, 8（4）: 404-412.
[22]	万金权．空气钻井流体力学参数设计与计算[D]．青岛：中国石油大学，2008.
[23]	邵帅．气体钻井大斜度井段最小携岩注气量研究[D]．大庆：东北石油大学，2014.
[24]	殷新胜，刘建林，冀前辉．松软煤层中风压空气钻进技术与装备[J]．煤矿安全，2012，43（7）：63－65. YIN Xinsheng, LIU Jianlin, JI Qianhui. Medium wind pressure air drilling technique and equipments in soft coal seam[J]. Safety in Coal Mines, 2012, 43（7）: 63-65.