Well drillers and borers and related workers position, assemble and operate drilling machinery and related equipment to sink wells, extract rock samples, liquids and gases or for a variety of other purposes.
(a)   Tasks include -
dismantling, moving and assembling drilling rigs and auxiliary equipment;
assembling and dismantling pipes, casings and drill heads, and replacing dysfunctional equipment;
operating controls to lower and raise drill pipes and casings in and out of wells, regulate pressure in the well and control the speed of tools;
preparing drilling fluid and checking the operation of pumps to ensure adequate circulation of fluid in drill pipe and well;
monitoring gauges and other indicators and listening to equipment to detect malfunctions and unusual well conditions, and determining the need to change drilling or equipment;
maintaining, adjusting, repairing and cleaning drilling rigs, hoisting and other machinery;
maintaining records of drilling and servicing operations;
operating machines and tools to extract dust, cuttings and lost and broken drilling equipment from holes and wells;
closing and sealing wells no longer in use;
may supervise and train crew members.