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。
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.
钻机采用了冲击反循环方式，钻进效率高，适应地层面广。
The driller adopts the percussion and reverse circulation drilling pattern, with the higher drilling efficiency and wider formation suitability.
在浅海岸边进行钻机作业，由于海平面水位不稳定，采用6BS反循环泵已不合适。
Due to unstable sea level, drilling by using 6bs counter circulation pump is not very suitable.
通过采用KTY4000型钻机和KPG3000A两种机型工程钻机成孔，排渣方式为气举反循环，以解决糊钻、PHP泥浆应用、钻机选型等问题。
The spread drill, application of PHP mud and choice of machine are solved by adopting two machines of KTY4000 and KPG3000A. Besides, the airlift reversing circulation is selected in slag discharge.
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。
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。
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。
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.
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