流体机械

2016, v.44;No.526(04) 23-28

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脉冲空化多孔射流钻头的结构设计研究
Study on Structural Design of Pulsed Cavitating Multi-hole Jet Bit

马东军;万立夫;李根生;
MA Dong-jun;WAN LI-fu;LI Gen-sheng;SINOPEC Research Institute of Petroleum Engineering;Chongqing University of Science & Technology;State Key Laboratory of Petroleum Resource and Prospecting(China University of Petroleum);

摘要(Abstract):

在多孔射流钻头的基础上,设计了脉冲空化多孔射流钻头,分析了其工作原理:当流体冲击叶轮高速旋转时,可对侧向孔眼入口处的流场产生有规律性的扰动,形成脉冲射流;同时,高速旋转的叶轮可以降低叶轮附近流体的局部压力,可产生许多微小空泡,夹杂在射流中形成空化射流。同时形成的2种射流进而耦合成脉冲空化射流。并利用流体力学和机械设计理论对射流钻头本体、叶轮轴和叶轮的结构参数进行了研究,研究结果可为脉冲空化多孔射流钻头结构设计提供依据。
On the basis of multi-hole nozzle,pulsed cavitating multi-hole nozzle was designed,and its modulation mechanism of pulsed cavitating jet was analyzed. When fluid flows through the impeller and drives it rotating rapidly,and then jets out from lateral orifices. Impeller is close to lateral orifices. For a lateral orifice,when a blade is directly facing the orifice,the orifice would be blocked by the blade and flow rate is minimum. When the gap of two blades is directly facing the orifice,the orifice would not be blocked and flow rate is maximum. In this way,flow rate of every lateral orifice changed regularly from large to small,then small to large with the impeller rotation. And then pulsed jet is produced. Meanwhile,high-speed revolving impeller can reduce local pressure around the impeller. When the local pressure is lower than saturation water vapor pressure,many tiny bubbles would be produced in the fluid. The fluid including tiny bubbles jets out from lateral orifices and cavitating jet is produced. Thus pulsed cavitating jet is produced by coupling pulsed jet and cavitating jet. Structural parameters of jet bit body,impeller and impeller shaft are studied by hydromechanics and machine design theory,the result can provide basis for structural design of pulsed cavitating multihole jet bit.

关键词(KeyWords): 脉冲;空化;多孔射流钻头;本体;叶轮;叶轮轴
pulsed;cavitating;multi-hole jet bit;body;impeller;impeller shaft

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划(973)项目(2010CB226700);; 国家科技重大专项专题(2011ZX05009-005)

作者(Author): 马东军;万立夫;李根生;
MA Dong-jun;WAN LI-fu;LI Gen-sheng;SINOPEC Research Institute of Petroleum Engineering;Chongqing University of Science & Technology;State Key Laboratory of Petroleum Resource and Prospecting(China University of Petroleum);

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