There is little mobility for supervisors from well services to welldrilling.
油井钻探和油井服务主管之间几乎没有流动性。
2
Equipped with suitable derrick and well controlled device in drilling a shallow gas well water drills proved to be able to reduce shallow gas welldrilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
3
But because Bonnie relatively weak, Allen expects the work stoppage to be brief-though it will take longer to get the relief welldrilling RIGS back and ready to work.