chain
coveralls
crude
donkey
drill
drilling
employment
equipment
experts
exploration
extraction
facility
field
fossil
fuel
gas
glasses
gloves
goggles
hard
hat
helmet
industrial
industrious
industry
job
manual
mining
nodding
occupation
oil
outdoors
people
petrochemical
petroleum
physical
powerful
production
protective
pump
rig
safety
strength
technology
unit
well
worker