downhole orientation井下定向
downhole calibration井下刻度
downhole processor井底资料处理机
downhole temperature井下温度
downhole monitoring井下监测
downhole engineering井下工程
downhole chamber井底集聚室
downhole e向下炮眼
Downhole sampler石油井下取样器;井下取样器
ADJ（形容词） (in the oil industry) denoting any piece of equipment that is used in the well itself (石油工业)油井中使用的