油井

yóujǐng
oil well

CEDICT

  1. (countable) oil well (Classifier: 口 m)
  2. oil well (Classifier: 口 m)

Wiktionary

为汲取原油，由地面鑽凿至地下油层的深井。

重編國語辭典

Entry Composition

1 油 yóu
  1. oil
  2. fat
  3. grease
  4. petroleum
  5. to apply tung oil, paint or varnish
  6. oily
  7. greasy
  8. glib
  9. cunning
2 井 jǐng
  1. a well
  2. neat
  3. orderly

classifier: 口