機器
arable land
chemical
clouds
crude
danger
derrick
drilling
ecology
energy
environment
equipment
facility
field
fossil
fuel
gas
gasoline
industrial
industry
landscape
mining
natural
nature
oil
oilfield
petroleum
pipe
pipeline
plant
pollution
power
production
pump
rays
rig
rocking
rod pump
russia
silhouette
sky
summer
sun
sunset
technology
well