GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.
0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。
The paper introduces the typical examples for resolving these problems by air-lift reverse circulation drilling technology.
介绍了应用气举反循环钻进工艺解决这些疑难技术问题的成功案例。
Also a CBA local air reverse circulation tool is designed with the required air pressure and consumption calculation formula given.
本文特别研究设计了CBA型局部气举反循环钻具，对钻进所需的空气压力和压气量给出了计算公式。
According to the exploration problems in an open-pit mine, a new drilling method using reverse circulation DTH hammer drill is put forward.
针对露天矿钻探施工中存在的问题，提出了利用贯通式反循环潜孔锤进行施工的新方法。
Rig GFC-120 is a kind of self moving reverse circulation rotary rigs. It is mainly used to drill side foundation holes and small water wells.
GFC-120型钻机为自走式动力头回转反循环钻机，用于降水井和护坡桩基础孔以及小型水井的施工。
The driller adopts the percussion and reverse circulation drilling pattern, with the higher drilling efficiency and wider formation suitability.
钻机采用了冲击反循环方式，钻进效率高，适应地层面广。
In addition, the effect of the reverse circulation in a bayonet tube type waste heat boiler on the safe operation of the apparatus is also discussed.
此外，本文还从工质流动特性上讨论了刺刀管式废热锅炉发生逆循环对于设备安全运行的影响。
Apply air reverse circulation drilling, appropriate increase length of twofold wall drill tools under certain conditions, may be drilling much deeper.
运用气举反循环钻进，在满足一定条件下适当增加双壁钻具长度即可得到较大钻进孔深。
This paper describes the theory, features and testing results of the air reverse circulation drilling process used in geo physical blast hole drilling.
概述了空气反循环钻进工艺应用于物探爆破孔施工的原理、特点及其试验应用情况。
Based on the historical experience of drilling technology, it is proposed to study the bottom process of large diameter reverse circulation rotary drilling.
根据钻探技术的历史经验，建议应进行大直径反循环回转钻进井底过程的研究。
GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.
GCF -2 0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。
The special reverse circulation swivel that matches with the improved shaft is developed. The construction and application of the swivel are introduced in this paper.
本文介绍了所设计的反循环水龙头的结构组成及其现场使用情况。
The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city's Hanjiang No.
介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city's Hanjiang No. 4 bridge site.
介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
The paper has introduced constructional properties, applicable sphere of pumping reverse circulation drilling, and its technical demands and the reasons of common hitchs and processing methods.
介绍了泵吸反循环钻进的施工特点、适用范围、施工中的技术要求与常见故障的原因及处理方法。
When excess slurry is left in the wellbore, it may not be possible to remove the excess slurry by conventional means, such as reverse circulation, before the slurry thickens and becomes immovable.
当多余的水泥浆被留在井筒中时，在水泥浆初凝和变成不可流动以前用常规的方法（如反循环）不可能去除这些多余的水泥浆。
When excess slurry is left in the wellbore, it may not be possible to remove the excess slurry by conventional means, such as reverse circulation, before the slurry thickens and becomes immovable.
当多余的水泥浆被留在井筒中时，在水泥浆初凝和变成不可流动以前用常规的方法（如反循环）不可能去除这些多余的水泥浆。
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