23965 WELL DRILLER
Sets up and operates portable drilling rig (machine and related
equipment) to drill wells. Extends stabilizing jackscrews to support and
level drilling rig. Moves levers to control power-driven winch that raises
and extends telescoping mast. Bolts trusses and guy wires to raised mast
and anchors them to machine frame and stakes. Assembles drilling tools,
using hand tools or power tools. Moves levers and pedals to raise tools
into vertical drilling position and lowers well casing (pipe that shores
up walls of well) into well bore, using winch. Moves levers and pedals and
turns handwells to control reciprocating action of machine and to drive or
extract well casing. Pumps water into well to facilitate drilling by
cooling drill bit and removing drillings. Listens to sounds of drilling
machine and feels cable or brake to determine drilling conditions and to
identify variations such as entering new strata or striking rock. Moves
levers to adjust stroke and impact of cable tool drilling machine or
changes drill bits of rotary drilling machine to fit changing conditions.
Replaces drill bit with tool to collect samples of earth or rock being
penetrated. Examines samples to determine nature of strata encountered or
submits samples to laboratory for analysis. Records drilling progress and
geological data. Splices worn or broken cable. May sharpen bits by heating
them in forging furnace and hammering edges on anvil. May build up worn
drill bits by arc welding, tempering bits in furnace, and by quenching
them in water. May retrieve lost equipment from bore holes, using
specialized retrieval tools and equipment. May fabricate well casings. May
restore wells to active production.
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