oil drilling facility; oil rig
Refers to the physical installation or platform used for drilling oil wells, often offshore.
There are several large oil drilling facilities in this sea area.
石油プラットフォーム is a more specific term for an offshore oil platform, while 油田掘削施設 is a broader term for any oil drilling facility.
Compound of 油田 (oil field), 掘削 (drilling), and 施設 (facility).