(3) Assistant Driller: a. Responsible for inspection, daily maintenance and record of mud pump, filling pump and mixing pump; Assist the driller in all his work; C, be responsible for checking the change of the liquid level in the mud pit, and notify the drill floor, foreman, drilling supervisor and relevant personnel in time if there is any abnormality; D. The substitutes for this position are scaffolder and experienced driller; E. Only under normal circumstances can it replace the driller's operation; F. Be responsible for gate rearrangement and timely line sweeping of choke manifold, kill manifold, riser manifold and mud filling system.