barrel
blue
business
cloud
color
construction
container
drill
ecology
energy
equipment
exploration
extraction
factory
fire
flame
fossil
fuel
gas
gasoline
industry
mineral
oil
oil field
petrochemical
petroleum
pipe
pipeline
plant
pollution
power
product
pump
refinery
rig
russia
sky
smoke
station
storage
tank
technology
torch
toxic
transfer
wealth
work