摘要
为探索更加合理的内喷孔结构形式,提出了一种新型内喷孔结构,并基于反循环钻头孔底流动模拟试验器与现有内喷孔结构进行了对比试验测试。运用CFD技术对内喷孔局部流场进行了数值模拟,揭示了不同类型内喷孔局部流场的流动特征,得出了新型内喷孔结构不同喷射角对其抽吸特性的影响规律。室内试验与数值模拟结果表明,新型内喷孔结构有利于反循环的形成,更有利于改善和提高专用反循环钻头(特别是大直径反循环钻头)的性能。
To explore the more reasonable structural form of internal jet orifice of drill bits, a new type of internal jet orifice structure was proposed. The comparative testing was conducted on the basis of the flow simulation tester at the orifice bottom of reverse circulation drill bit and existing structure of internal jet orifice. The CFD tech- nology was applied to conduct a numerical simulation of the local flow field of the orifice, disclosing the flow characteristics of the local flow field of different types of jet orifices and obtaining the law of the effect of different jet angles on the suction property. The laboratory experiment and numerical simulation show that the neotype structure of internal jet orifice is favorable to the formation of reverse circulation and more favorable to the improvement of the performance of special reverse circulation drill bit, especially large-diameter reverse circulation drill bit,
出处
《石油机械》
北大核心
2012年第6期7-12,共6页
China Petroleum Machinery
基金
中国地质调查局项目"难钻进地层新型钻探设备器具及工艺研究"(1212010816018)
四川石油钻井工艺研究院合作项目(2006220100003435)
关键词
反循环钻头
内喷孔
抽吸特性
试验测试
数值模拟
reverse circulation drill bit
internal jet orifice
suction property
testing
numerical simulation
