摘要
为了研究定向长钻孔孔内压力变化规律,基于质量和动量分析法,利用相似性原理结合PVC管路气体流动试验,推导得出定向长钻孔孔内压力分布模型。研究表明:钻孔孔内主流速度沿管长呈指数型分布,动量交换系数与钻孔孔内的相对动能差呈线性关系;动量交换在总压力损失中起决定性作用,伯努利方程无法体现;钻孔孔内负压与孔口负压呈正比,孔内负压损失量与孔口负压无关;定向长钻孔孔内负压与钻孔深度呈指数关系;存在1个钻孔直径,使得长钻孔内百米负压损失最小。
In order to study the variation law of pressure in the directional long borehole,the pressure distribution model in the directional long borehole is deduced based on the mass and momentum analysis method and the similarity principle combined with the gas flow test of the PVC pipeline.The results show that:the velocity of the mainstream in the borehole is exponentially distributed along the length of the pipe,and the momentum exchange coefficient k is linearly related to the relative kinetic energy difference in the borehole;momentum exchange plays a decisive role in the total pressure loss,which cannot be reflected by the Bernoulli equation;the negative pressure in the borehole is proportional to the negative pressure at the orifice,and the loss of negative pressure in the hole has nothing to do with the negative pressure at the orifice;the negative pressure in the directional long drilling hole has an exponential relationship with the drilling depth;the presence of one hole diameter minimizes the negative pressure loss in 100 meters in long holes.
作者
吴泽平
刘军
张露伟
卢鹏
刘志宽
WU Zeping;LIU Jun;ZHANG Luwei;LU Peng;LIU Zhikuan(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454010,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Jiaozuo 454003,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《煤矿安全》
CAS
北大核心
2023年第11期1-8,共8页
Safety in Coal Mines
基金
国家自然科学基金资助项目(52074107)
河南省科技攻关计划资助项目(222102320050)
河南省高校基本科研业务费专项资金资助项目(NSFRF210426)。
关键词
长钻孔
相似性原理
沿程阻力
动量交换
压力分布
long borehole
similarity principle
longitudinal resistance
momentum exchange
pressure distribution
