Petroleum Industry maintains two primary measurement unit systems: Oil Metric (based on SI
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units) and Oil Field (based on Imperial units).
Both Oil Metric and Oil Field unit systems have deviations from their original base systems.
Some companies historically maintain customised unit systems at corporate level which are usually a slight variation of one of the two primary systems.
See Units Conversion for on-line converters between various units.
Symbol | Dimension | SI | Oil Metric | Oil Field | Additional | |
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Dimensionless quantity | – | – | frac | frac | frac | |
Time | t | T | s |
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d = |
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L | L | m | m = 3.281 ft | ' = ft = 0.3048 m | ||
Area | A | L2 | m2 | m2 | ||
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Volume | V | L3 | m3 | m3 = 6.289811 bbl | bbl = 5.61458 ft3 = 0.158986938944 m3 | tonne = 7.28 bbl (Urals) ÷ 7.59 bbl (Brent) with average 7.33 bbl (WTI ) |
Mass / Weight | M, m | M | kg | kg | lb = 0.45359237 kg | g = 10-3 kg |
Amount of chemical substance | ν | 1 | mol | mol | mol | |
Molar mass | kg / mol | |||||
Pipe Diameter |
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Θ |
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= 9/5 T [ |
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°C | |||
Pressure (absolute) | P | M L-1 T-2 | Pa |
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6 Pa = 145 |
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Pgauge |
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Volumetric flow rate (oil & water) | q, Q | L3 T-1 | m3/s |
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(gas) |
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qg, Qg |
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g/ |
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g/ |
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gravity (oil) | γ | – |
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cc | γ = ρ / ρw | ||
Compressibility | c | L T2 M-1 | Pa-1 |
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md = 9. |
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cp = 10 |
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−3 Pa |
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1 m3/( |
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Pa· |
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s) = |
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·s) |
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0.3048 (md·m)/cp | |||
Pressure diffusivity | χ | L2 T-1 | m2/s |
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101.325 (md·kPa)/cp |
Wellbore storage |
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· |
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°K) |
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· |
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°C) = |
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· |
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°C) |
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cp | M L2 T-2 Θ-1 | J/(kg⋅°K) | J/(kg⋅°C) = J/(kg⋅°K) | BTU/(lbm⋅°F)= 4186.798188 J/(kg⋅°C) | ||
Thermal diffusivity | a | L2 T-1 | m2/s | m2/s = 0.0929 ft2/s |
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See also
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Natural Science / Engineering / Measurement / Unit / Units Systems
[ Units Conversion ] [ Volume units used in petroleum engineering ]
[ Petroleum Industry (Oil & Gas Industry) ]
[ Petroleum Metric Unit System ] [ Petroleum British Unit System ][ Petroleum Russian Unit System ]
Reference
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http://www.petroleumoffice.com/unitconverter
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