downhole operation

例句：

1. 1. Downhole operations are crucialfor the safe extraction of minerals from undergroundreservoirs.
   井下作业对于从地下储层安全提取矿物至关重要。
2. 2. The engineers performed a thorough inspection of the downhole operation equipment before starting the drillingprocess.
   工程师们在开始钻探过程之前，对井下作业设备进行了彻底的检查。
3. 3. Downhole operations require specialized training andsafety measures to ensure the well is completedsafely.
   井下作业需要专门的培训和安全措施，以确保井顺利完成。