Derrickhand

[2] Their job is to guide the stands of the drill pipe into the fingers at the top of the derrick.

Other duties might include monitoring pH and calcium levels, viscosity and the mud weight (density), adding chemicals and oil based fluids, and being responsible for the shale shakers and mud pump.

When tripping into the hole (or "running in") they will pull the pipe out of the fingers and guide it into the elevators suspended from the top drive.

Traditionally, the derrickhand also works closely with the mud engineer (see drilling fluid) when not tripping pipe since they are not needed in the derrick.

They are also responsible for the shale shakers and mud pumps (making sure they run well and fixing them as needed).