Petropedia Terms beginning with O
- O&G
- O-Ring
- O-Rings
- Obsidian
- Occupational Safety and Health Act (OSHA)
- Occupational Safety and Health Act of 1970 (OSH Act)
- Occupational Safety and Health Act of 1970 (OSH Act)
- Occupational Safety and Health Administration (OSHA)
- Occupational Safety and Health Administration Act (OSHA Act)
- Ocean Dumping Act
- OCS
- Octane
- Octane Level
- Octane Rating
- Odorant
- Offshore
- Offshore Production Platform
- Offshore Rig
- Offshore Rig Count
- Offshore Rigging
- Oil
- Oil and Gas (O&G)
- Oil And Gas Consulting
- Oil and Gas Insurance
- Oil And Gas Lease
- Oil And Gas Separator
- Oil Based Mud
- Oil Cooler
- Oil Density
- Oil Drill Bits
- Oil Emulsion Mud
- Oil Formation Volume Factor
- Oil Industry
- Oil Operator
- Oil Oversupply
- Oil Pan
- Oil Patch
- Oil Pollution Act of 1990 (OPA)
- Oil Price
- Oil Price Chart
- Oil Price Forecast
- Oil Price Forecast
- Oil Prices
- Oil Pump
- Oil Pump jack
- Oil Recovery
- Oil Refinery
- Oil Sand
- Oil Sands
- Oil Scout
- Oil Seep
- Oil Shale
- Oil Spill
- Oil Stocks
- Oil Storage
- Oil Storage Tanks
- Oil Tanker
- Oil Viscosity
- Oil Well
- Oil Well Blowout
- Oil Well Pump
- Oil Worker
- Oil Zone
- Oil-Emulsion Mud
- Oil-In-Water Emulsion Mud
- Oil-Water Emulsion
- Oilfield
- Oilfield Cementing
- Oilfield Drilling
- Oilfield Drilling Bits
- Oilfield Emulsion
- Oilfield Fishing Tools
- Oilfield Insurance
- Oilfield Pipe
- Oilfield Terminology
- Oilwell
- Oilwell Cement
- One-Way Valve
- OPA
- OPEC
- Open Drip-Proof Enclosure
- Open Hole
- Open Hole Logging
- Openhole Completion
- Operating Interest
- Optimization
- Organic Compounds
- Organization of Petroleum Exporting Countries (OPEC)
- Orifice Plate
- ORRI
- OSH Act
- OSHA
- OSHA
- OSHA Act
- Otis Vee Packing
- Outage Tape-and-Bob Procedure
- Outer Continental Shelf (OCS)
- Outwash
- Overriding Royalty
- Overriding Royalty Interest (ORRI)
- Oxidation
- Oxidizing Agent
- Oxyacetylene Welding
- Oxygen Toxicity
- Oxygenation
- Ozone