The Driller and the Derrickman must be able to communicate at all times when the Derrickman is working on the derrick board.
当井架工在二层台工作时，司钻和井架工一定要能时刻保持联系。
2
The mud engineer also works closely with the rig's derrickman, who is charged with making scheduled additions to the mud during his work period.
泥浆工程师也要和司钻紧密合作，因为司钻负责在工作期间按计划加入泥浆添加剂。
3
We not only organized captains to proceed operation, but also looked upon the operation training to the post personnel, especially the driller, assistant driller, derrickman and crane driver.