oil - oper
- oil
- oil / gas gathering
- oil / gas reservoir drive
- oil absorbtion plant
- oil accumulation
- oil and gas gathering system
- oil and gas processing facility
- oil ash
- oil bearing seam
- oil bitumen
- oil coke
- oil company
- oil conditioning for transport
- oil consumption
- oil contamination
- oil content
- oil cooler
- oil cut
- oil degasification
- oil displacement
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