油井

1. Origins, structure, and basic meaning

• Structure: 油井(ゆせい) means a well drilled into the ground to extract oil.
• Basic usage: It describes drilling a new well or temporarily closing one because of a leak.

2. Common pitfalls and similar expressions

• An oil well and an oilfield
  • 油井 is an individual well for extracting oil; 油田 is an area containing oil deposits.
• Reading 井
  • In 油井, 井 is read せい, unlike its reading in 井戸(いど).