- Objective function @model
- Observation Well = OW
- Octane = C8H18
- Offtakes (withdrawals)
- Ohm = Ω(unit)
- Oil (chemical substance)
- Oil (disambiguation)
- Oil (fluid phase)
- Oil & Gas Industry
- Oil+Gas RPM Corey @model
- Oil+Water RPM Corey @model
- Oil barrel = bbl
- Oil Column Thickness
- Oil compressibility = co
- Oil Control (Reservoir Flow Modelling)
- Oil correlations
- Oil density
- Oil depletion
- Oil Depot
- Oil displacement efficiency
- Oil Drive
- Oil Field
- Oilfield Services = OFS
- Oilfield units
- Oil formation volume factor = Bo
- Oil formation volume factor Bo @model
- Oil-gas capillary pressure
- Oil-Gas Corey curvature (nog)
- Oil-Gas exchange
- Oil-Gas relative permeability (krgo)
- Oil-gas relative permeability (krog)
- Oil Initial In Place = OIIP = Oil Original In Place = OOIP
- Oil in Place (OIP)
- Oil In Place = OIP
- Oil isothermal Compressibility @model
- Oil isothermal Compressibility = co
- Oil Metric Unit System
- Oil Mobility
- Oil Pay Area
- Oil permeability
- Oil phase pressure = po
- Oil Pore Volume
- Oil Price
- Oil Producer (well) = OP
- Oil production economics
- Oil Production Plant
- Oil production rate
- Oil Rate Cut-off
- Oil Recovery Factor = RFO
- Oil relative permeability
- Oil Reserves = OR = Recoverable Oil
- Oil Reservoir
- Oil sandface flowrate = qo
- Oil Sandface Productivity Index
- Oil saturation
- Oil specific gravity = yo
- Oil surface flowrate = qO
- Oil Surface Productivity Index
- Oil viscosity
- Oil viscosity correlations
- Oil-water capillary pressure
- Oil Water Contact = OWC
- Oil-Water Corey curvature (now)
- Oil-water relative permeability (krow)
- Old wells
- Open-Hole = OH
- Open-Hole Data Acquisition
- Open-Hole Formation Logging (OHFL)
- Open-Hole Well
- Open-Hole Well Test
- Open porosity
- Operating Cash Flow = OCF (Finance)
- Operating Expenses = OPEX (Finance)
- Operating Income (Finance)
- Operating Margin
- Operating Profit (Finance)
- Operating Revenue (Finance)
- Operations Management
- Optical Defectoscopy
- Optimisation problem @model
- Organic chemical substance
- Organization
- Orifice
- Orifice Plate
- Orifice Plate Discharge coefficient @ model
- Orifice Plate Expansibility Factor @ model
- Orifice Plate Expansion Factor @model
- Outer Diameter (OD)
- Ovalle Dew Point Pressure Correlation @model
- Ovalle Vaporized Oil Ratio Correlation @model
- Overbank (Floodplain)
- Overburden Pressure
- Overtraining
- Oxygen Activation Logging
- Petroleum Imperial Unit System
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