What oil well is made of
A well for extracting oil; drilling at Absheron and by Drake.
- Steel well casing — has part. Steel pipes line the borehole.
- Tubing string — has part. Oil rises through them.
- Christmas tree valve assembly — has part. Valves at the wellhead.
- Oil pumpjack — has part. It drives the sucker-rod pump.
- Drilling rig — uses. A well is drilled by a rig.
- Wrought iron — is made of. The casing pipes are iron.