oil well
A well drilled to extract petroleum. Used in energy, geology, and news contexts; distinguish from 油田, an oil field or petroleum deposit area.
Many oil wells are being drilled in this region.
After the accident, crude oil leaked from the oil well.
The company drilled an oil well in the desert.
井戸 is a general well usually dug for water, whereas 油井 specifically means a well for extracting petroleum.
oil well pipe
A Sino-Japanese compound written with 油, meaning oil, and 井, meaning well; the spelling directly reflects the sense of an oil well.
A large amount of oil is extracted from this oil well every day.