Petroleum industry maintains Industry maintains two major primary measurement unit systems: Oil Metric (based on SI units) and Oil Field (based on Imperial units).
Both Oil Metric and Oil Field have unit systems have deviations from their original basement base systems.
Some companies historically maintain customized customised unit systems at 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 | |
---|---|---|---|---|---|---|
Dimensionless quantity | – | – | frac | frac | frac | |
Time | t | T | s | d = 86,400 s | d = 86,400 s | hr = 3,600 s |
Length | L | L | m | m = 3.281 ft | ' = ft = 0.3048 m | |
Area | A | L2 | m2 | m2 | ||
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 | d, ø | L | m | m = 39.37 in | " = in = 0.0254 m | mm = 0.001 m= 0.0393701 in |
Temperature | T | Θ | K | °C = K - 273 | °F = 9/5 T [°C] + 32 | K = 273 °C |
Pressure (absolute) | P | M L-1 T-2 | Pa | psi = 6894.76 Pa = 6.89476 kPa | ||
Pressure (gauge) | Pgauge | M L-1 T-2 | Pa | kPa(g) = kPa(abs) - 101,325 kPa | psi(g) = psi(abs) - 14.6959 psi | |
Volumetric flow rate (oil & water) | q, Q | L3 T-1 | m3/s | 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 | |||||
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 | g/cc = 103 kg/m3 |
lb/ |
Density (oil) | ρo | M L-3 | kg/m3 | g/cc = 103 kg/m3 | °API = (141.5/ |
---|
SG) - 131.5 | |
Specific |
---|
gravity (oil) | γ | – | – | 1 = 103 kg/m3 | 1 = g/cc | γ = ρ / ρw |
---|---|---|---|---|---|---|
Compressibility | c | L T2 M-1 | Pa-1 | psi-1 = 0.145 · 10-3 Pa-1 = 0.145 kPa-1 | ||
Permeability | k | L2 | m2 | md = 9.869233 · 10−16 m2 | md = 9.869233 · 10−16 m2 | D = 9.869233·10−13 m2 |
Porosity | φ | – | frac | frac | frac | p.u. = % = 100 frac |
Dynamic Viscosity | μ | M L-1 T-1 | Pa⋅s | cp = 10−3 Pa⋅s | cp = 10−3 Pa⋅s | 1 P = 100 cp |
Productivity | J | L4 T M-1 | m3/(Pa·s) |
Pa· |
s) 1 |
bpd/psi = |
0.0231 cmd /kPa |
Transmissibility | σ | L4 T M-1 | m3/(Pa·s) | (md·m)/cp = 9.87 · 10-13 m3/(Pa·s) | (md·ft)/cp = |
---|
0.3048 (md·m)/cp |
64 · 10-3 cmd/ |
Pressure diffusivity | χ | L2 T-1 | m2/s | (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 | |||
Thermal conductivity | λ | M L T-3 Θ-1 | W/(m· |
---|
°K) | W/(m ·°C) = |
W/(m·°K) | BTU/(hr⋅ft⋅°F) = |
1.7295772 W/(m ·°C) | |||
Specific heat capacity | 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 |
---|
See also
...
Natural Science / Engineering / Measurement / Unit / Units Systems
[ Units Conversion ] [ Volume units used in petroleum engineering ]
[ Petroleum Industry (Oil & Gas Industry) ]
[ Volume units used in petroleum engineering ] Petroleum Metric Unit System ] [ Petroleum British Unit System ][ Petroleum Russian Unit System ]
Reference
...
http://www.petroleumoffice.com/unitconverter