extension drilling meaning in Chinese
扩边钻井
Examples
- Automatic extension drill
手摇骨钻 - The extension drill rod which can be used for higher capacity drill , the drill hole can be extended to sezeral meetrs , when drilling the straight hole , the core lifter can help coring
选用加长钻杆于较大能力的钻机，可将钻孔延深至数米，钻垂直孔时，可采用取芯器配合取芯。