art
barrel
building
business
color
colorful
contour
crude
derrick
diesel
drill
drilling
energy
environment
equipment
exploration
extraction
factory
fuel
gas
gasoline
icon
illustration
industrial
industry
isolated
line
linear
lineart
oil
outline
petroleum
pipe
pipeline
plant
platform
pollution
power
production
pump
red
refinery
resource
rig
silhouette
technology
tower
white
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