为: support; stand for换: exchange; barter; trade钻头: boring crown; bore bit; dril ...起: rise; get up; stand up下: below; down; under; undernea ...钻: drill; auger为更换钻头而进行起下钻作业: bit trips起下钻: make a trip; round trip换钻头: bit change cambio de barrena; bit changing短起下钻: short trip刮拭起下钻: wiper trip划眼起下钻: wiper trip扩眼起下钻: reaming trip起下钻方式: trimode起下钻杆: pulling and running the drill pipe起下钻具: make a trip起下钻脉冲: tripping pulse起下钻气: trigas起下钻气量: tg起下钻时间: time on trips起下钻显示: trishow起下钻阻卡: blockage during tri ing; blockage during tripping起下钻作业: round trip operations; tripping operation一次起下钻: round trip更换钻头: bit change