| Answer | Crossword Clue |
|---|---|
| BBL | Unit of oil production: Abbr. |
| BBL | Unit of oil production (Abbr.) |
| BBL | Unit of oil production, briefly |
| oilfield | an area of mineral oil production |
| oilfields | OILFIELD, an area of mineral oil production |
| upstream | At a stage in the process of gas or oil extraction and production before the raw material is ready for refining |
| downstream | At a stage in the process of gas or oil extraction and production after the raw material is ready for refining |
| waterflood | a flood of water; an inundation to inject water to maintain pressure in a reservoir and to drive the oil, etc towards the production wells |
