n: the employee normally in charge of a specific (tour) drilling or workover crew. The driller's main duty is operation of the drilling and hoisting equipment, but this person may also be responsible for downhole condition of the well, operation of downhole tools, and pipe measurements.
One who operates a drilling rig. The person who is in charge of drilling operations and who supervises the drilling crew.
The Driller is in charge of his crew, and running the rig itself. Most of the time, his job is simply to monitor the rig's activity, while the Automatic Driller runs the breaks and drills the hole. He is responsible of interpreting the signals the well gives regarding gas and fluids with high pressure.In an emergency he is also responsible for taking the correct counter measures to stop an uncontrolled well control situation from emerging.