Study on factors influencing the self-propelling capacity of self-propelled water jet drill bits

Authors

LIU Yong, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, ChinaFollow
DAI Shuo, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China
WEI Jianping, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, ChinaFollow
ZHANG Hongtu, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China
YUAN Yongwang, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China
GUO Xinhui, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China
GAO Yingjun, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000 , China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China

Abstract

The structural characteristics of inner flow field in a pipeline are the key factors influencing the self-propelling capacity and descaling-unblocking capability of the self-propelled drill bit. To address the problem concerning the effect of the changes in the inner flow field of a pipeline under the joint action of multiple jets on the self-propelling force and the resistance to water backflow, the changes of inner flow field in the pipeline under different conditions were numerically analyzed based on FLUENT, and thus the influence law of the angle of rear nozzle, the rotational speed, the annular ratio and the system pressure on the self-propelling force was defined, revealing the reasons for the error of the theoretical value of the integrated friction coefficient. Besides, the primary and secondary relationships of the factors influencing the self-propelling force were clarified through orthogonal numerical simulations. Then, the self-propelling force testing experiments were carried out under different conditions with the self-propelling force test device to verify the correctness of the numerical simulation results. As shown by the results, the action of vortex squeeze collision and jet suction leads to a pressure gradient in front of and behind the self-propelled drill bits, thus increasing the self-propelling force. The angle of the rear nozzle is increased from 20° to 45°, the countercurrent velocity of wall jet is increased from 6.2 m/s to 14.5 m/s and the peak pressure after vortex collision extrusion is increased from 68.47 kPa to 80.79 kPa, resulting in an increase in differential pressure. Increasing the rotational speed could reduce the range of primary vortex, while the differential pressure applied on the rotating body increases during the collision and squeeze of vortex in the rotating body area. Increasing the rotational speed and the system pressure, or reducing the annular ratio, will increase the isolation effect of the rear jet, thus increasing the self-propelling force. The theoretical value of the integrated friction coefficient needs to be corrected as the effect of the vortex zone is ignored in the theoretical calculation of the resistance to water backflow. The extreme differences of the annular ratio, system pressure, rotational speed and angle of the rear nozzle are 300.07, 111.87, 60.42 and 36.32 respectively, and the main relationships of the influencing factors are: annular ratio > system pressure > rotational speed > angle of the rear nozzle. Generally, the research in this paper could provide a reference for the optimization design in structure and the improvement of self-propelling capacity of the self-propelled drill bits.

Keywords

gas drainage, borehole restoration, borehole blockage, self-propelled drill bit, water jet

DOI

10.12363/issn.1001-1986.22.09.0691

Recommended Citation

LIU Yong, DAI Shuo, WEI Jianping, et al. (2023) "Study on factors influencing the self-propelling capacity of self-propelled water jet drill bits," Coal Geology & Exploration: Vol. 51: Iss. 5, Article 21.
DOI: 10.12363/issn.1001-1986.22.09.0691
Available at: https://cge.researchcommons.org/journal/vol51/iss5/21

Reference

[1] 董书宁,刘再斌,程建远,等. 煤炭智能开采地质保障技术及展望[J]. 煤田地质与勘探,2021,49(1):21−31.

DONG Shuning,LIU Zaibin,CHENG Jianyuan,et al. Technologies and prospect of geological guarantee for intelligent coal mining[J]. Coal Geology & Exploration,2021,49(1):21−31.

[2] 刘勇,代硕,魏建平,等. 低压磨料空气射流破硬岩规律及特征实验研究[J]. 岩石力学与工程学报,2022,41(6):1172−1182.

LIU Yong,DAI Shuo,WEI Jianping,et al. Experimental study on hard rock breaking laws and characteristics by low−pressure abrasive air jet[J]. Chinese Journal of Rock Mechanics and Engineering,2022,41(6):1172−1182.

[3] 袁亮. 我国深部煤与瓦斯共采战略思考[J]. 煤炭学报,2016,41(1):1−6.

YUAN Liang. Strategic thinking of simultaneous exploitation of coal and gas in deep mining[J]. Journal of China Coal Society,2016,41(1):1−6.

[4] 张超林,王恩元,王奕博,等. 近20年我国煤与瓦斯突出事故时空分布及防控建议[J]. 煤田地质与勘探,2021,49(4):134−141.

ZHANG Chaolin,WANG Enyuan,WANG Yibo,et al. Spatial–temporal distribution of outburst accidents from 2001 to 2020 in China and suggestions for prevention and control[J]. Coal Geology & Exploration,2021,49(4):134−141.

[5] 梁道富,曹建明,代茂,等. 贵州青龙煤矿碎软煤层区域瓦斯递进式抽采技术[J]. 煤田地质与勘探,2020,48(5):48−52.

LIANG Daofu,CAO Jianming,DAI Mao,et al. Progressive gas extraction technology in broken soft coal seam of Qinglong Coal Mine,Guizhou Province[J]. Coal Geology & Exploration,2020,48(5):48−52.

[6] 邹士超,辛嵩. 煤层瓦斯钻孔有效抽采半径研究[J]. 中国安全科学学报,2020,30(4):53−59.

ZOU Shichao,XIN Song. Effective extraction radius of gas drilling in coal seam[J]. China Safety Science Journal,2020,30(4):53−59.

[7] 齐庆新,潘一山,舒龙勇,等. 煤矿深部开采煤岩动力灾害多尺度分源防控理论与技术架构[J]. 煤炭学报,2018,43(7):1801−1810.

QI Qingxin,PAN Yishan,SHU Longyong,et al. Theory and technical framework of prevention and control with different sources in multi−scales for coal and rock dynamic disasters in deep mining of coal mines[J]. Journal of China Coal Society,2018,43(7):1801−1810.

[8] 刘勇,李志飞,魏建平,等. 磨料空气射流破煤冲蚀模型研究[J]. 煤炭学报,2020,45(5):1733−1742.

LIU Yong,LI Zhifei,WEI Jianping,et al. Erosion model of abrasive air jet used in coal breaking[J]. Journal of China Coal Society,2020,45(5):1733−1742.

[9] 刘勇,魏建平,王登科,等. 磨料气体射流冲蚀磨损岩石特征分析[J]. 煤炭学报,2018,43(11):3033−3041.

LIU Yong,WEI Jianping,WANG Dengke,et al. Erosive wear characteristic of rock impacted by abrasive gas jet[J]. Journal of China Coal Society,2018,43(11):3033−3041.

[10] 孙龙德,江同文,王凤兰,等. 关于油田寿命的思考[J]. 石油学报,2021,42(1):56−63.

SUN Longde,JIANG Tongwen,WANG Fenglan,et al. Thoughts on the development life of oilfield[J]. Acta Petrolei Sinica,2021,42(1):56−63.

[11] LANDERS C. Method of and apparatus for horizontal well drilling：US06125949A[P]. 2000-10-03.

[12] 刘玉洲,陆庭侃,柳晓莉. 煤层气井超短半径自进式水平钻井技术研究[J]. 天然气工业,2006,26(2):69−72.

LIU Yuzhou,LU Tingkan,LIU Xiaoli. Self−feeding horizontal drilling technology with super−short radius for coal−bed methane wells[J]. Natural Gas Industry,2006,26(2):69−72.

[13] 刘勇,梁博臣,何岸,等. 自进式旋转钻头钻孔修复理论及关键参数研究[J]. 中国安全生产科学技术,2016,12(2):39−44.

LIU Yong,LIANG Bochen,HE An,et al. Research on theory and technical parameter of borehole restoration for self−propelling and rotating drill[J]. Journal of Safety Science and Technology,2016,12(2):39−44.

[14] 贺乐昌. 水力深穿透射孔自进旋转喷头关键参数研究[D]. 哈尔滨：哈尔滨工业大学，2009.

HE Lechang. Study on key parameters of self–propelled rotatory nozzle for water−jet deep penetrating perforation[D]. Harbin：Harbin Institute of Technology，2009.

[15] 董惠娟,白良浩,吕岩,等. 自进式高压水射流破岩数值模拟分析[J]. 石油机械,2010,38(12):29−33.

DONG Huijuan,BAI Lianghao,LYU Yan,et al. A numerical simulation analysis of self–propelled high–pressure water jet rock breaking[J]. China Petroleum Machinery,2010,38(12):29−33.

[16] 郭瑞昌,李根生,黄中伟,等. 多孔式射流钻头流场数值模拟研究[J]. 流体机械,2010,38(4):13−17.

GUO Ruichang,LI Gensheng,HUANG Zhongwei,et al. Numerical simulation study on flow field of multi–hole jet bit[J]. Fluid Machinery,2010,38(4):13−17.

[17] 刘勇，代硕，魏建平，等. 自进式钻头钻孔修复运动方程及关键参数研究[J/OL]. 河南理工大学学报 (自然科学版)，2022：1–11 [2023-01-06]. http://kns.cnki.net/kcms/detail/41.1384.N.20220530.1046.002.html.

LIU Yong，DAI Shuo，WEI Jianping，et al. Research on equations of motion and technical parameter of borehole restoration for self−propelling drill[J/OL]. Journal of Henan Polytechnic University (Natural Science)，2022：1–11[2023-01-06]. http://kns.cnki.net/kcms/detail/41.1384.N.20220530.1046.002.html.

[18] 祝效华,陈伟. 自进式喷头自进力影响因素分析及参数优化[J]. 水动力学研究与进展,2018,33(1):89−97.

ZHU Xiaohua,CHEN Wei. Analysis on influencing factors of self−propelled force and parameters optimization of the jet nozzle[J]. Chinese Journal of Hydrodynamics,2018,33(1):89−97.

[19] ZHANG X,LIU X,GENG D,et al. Numerical simulation on the flow field of self–propelled multi–orifices nozzle for ultra–short radius radial jet drilling[J]. International Journal of Oil,Gas and Coal Technology,2018,17(1):1−11.

[20] 莫丽,王军. 自推进喷嘴井筒内流场数值模拟[J]. 中南大学学报 (自然科学版),2015,46(10):3656−3662.

MO Li,WANG Jun. Numerical simulation for wellbore flow field of self–propelled nozzle[J]. Journal of Central South University (Science and Technology),2015,46(10):3656−3662.

[21] PENG Haojun,ZHANG Ping. Numerical simulation of high speed rotating waterjet flow field in a semi enclosed vacuum chamber[J]. Computer Modeling in Engineering & Sciences,2018,114(1):59−73.

[22] 张欣玮,汤积仁,卢义玉,等. 淹没条件下水射流涡旋特性大涡模拟及实验研究[J]. 中国石油大学学报 (自然科学版),2015,39(3):98−104.

ZHANG Xinwei,TANG Jiren,LU Yiyu,et al. Large eddy simulation and experimental study on vortex characteristics of water jet in submerged condition[J]. Journal of China University of Petroleum (Edition of Natural Science),2015,39(3):98−104.