open hole，starting a hole，spud-in ①钻探设备安装完毕、验收合格后，开始的钻进工作。 ②钻孔中途停钻后，恢复正常钻进工作。
智利矿难救援人员开钻救生井开始营救33名被困矿工。
Drilling began to rescue the 33 workers trapped in a collapsed mine in Chile.
救援人员称，作为备用他们将会重新开钻另一口竖井，以防第一口竖井出现问题。
Rescuers said they would resume drilling a separate shaft as a back-up plan in case of problems with the first one.
井下出现复杂情况，不要离开钻台。
There is some trouble in the borehole, don't leave the rig floor.
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