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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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 |
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Amount of chemical substance | ν | 1 | mol | mol | mol | |
Molar mass | kg / mol | |||||
Pipe Diameter | d, ø | L | m | m = 39.37 in | " = in = 0.0254 m | mm = 0.001 m= 0.0393701 in |
Temperature |
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T | 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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Pgauge |
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Volumetric flow rate (oil & water) | q, Q | L3 T-1 | m3/s |
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cmd = m3/d = 1.16 · 10-5 m3/s | bpd = 0.184 · 10-5 m3/s = 0.159 cmd | |||||
Volumetric flow rate (gas) | qg, Qg | L3 T-1 | m3/s | cmd = m3/d= 35.3147 scf/d | scf/d = ft3/d = 0.0283168 cmd | |
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GOR | GOR, Rs, Yg | – | m3/m3 | m3/m3 = 5.615 scf/bbl | scf/bbl = 0.1781 m3/m3 | |
Density (solids) | ρ | M L-3 | kg/m3 |
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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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Pressure diffusivity | χ | L2 T-1 | m2/s |
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(md·kPa)/cp = 9.869233 · 10−10 m2/s | (md·psi)/cp = 6.89476 (md·kPa)/cp | (md·atm)/cp = 101.325 (md·kPa)/cp | ||||
Wellbore storage | WBS, CS | L4 T2 M-1 | m3/Pa | m3/kPa = 0.001 m3/Pa | bbl/psi = 0.0231 m3/kPa | |
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Thermal conductivity | λ | M L T-3 Θ-1 | W/(m |
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· |
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°K) |
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°C) |
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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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