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Petroleum Industry maintains two primary measurement unit systems: Oil Metric (based on SI 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.



SymbolDimensionSIOil MetricOil FieldAdditional
Dimensionless quantity––fracfracfrac
TimetTsd = 86,400 sd = 86,400 shr = 3,600 s
LengthLLmm = 3.281 ft' = ft = 0.3048 m

km = 103 m, cm = 10-2 m, mm = 10-3 m

AreaAL2m2m2

ft2 = 0.09290304 m2

ac = 4,047 m2 = 43,560 ft2

ha = 10,000 m2 = 2.471 ac

VolumeVL3m3m3 = 6.289811 bbl

bbl = 5.61458 ft3 = 0.158986938944 m3

Mbbl = 103 bbl , MMbbl = 106 bbl

1 ft3 = 0.178107712420163 bbl

scf = ft3 = 0.0283168 m3

cc = cm3 = 1 · 10-6 m3

tonne = 7.28 bbl (Urals) ÷ 7.59 bbl (Brent) with average 7.33 bbl (WTI )

Mass / WeightM, mMkgkglb = 0.45359237 kgg = 10-3 kg
Amount of chemical substanceν1molmolmol
Molar mass

kg / mol


Pipe Diameterd, øLmm = 39.37 in" = in = 0.0254 mmm = 0.001 m= 0.0393701 in
TemperatureTΘK°C = K - 273°F = 9/5 T [°C] + 32K = 273 °C
Pressure (absolute)PM L-1 T-2Pa

kPa = 103 Pa = 0.145038 psi

MPa = 103 Pa = 145.038 psi

GPa = 106 Pa = 145,038 psi

psi = 6894.76 Pa = 6.89476 kPa

bar = 105 Pa = 100 kPa = 14.5038 psi

atm = 101,325 Pa = 101.325 kPa = 14.6959 psi

Pressure (gauge)PgaugeM L-1 T-2

PakPa(g) = kPa(abs) - 101,325 kPapsi(g) = psi(abs) - 14.6959 psi
Volumetric flow rate (oil & water)q, QL3 T-1m3/scmd = m3/d = 1.16 · 10-5 m3/sbpd = 0.184 · 10-5 m3/s = 0.159 cmd
Volumetric flow rate (gas)qg, QgL3 T-1m3/scmd = m3/d = 35.3147 scf/dscf/d = ft3/d = 0.0283168 cmd
GORGOR, Rs, Yg–m3/m3m3/m3 = 5.615 scf/bbl scf/bbl = 0.1781 m3/m3
Density (solids)ρM L-3kg/m3g/cc = 103 kg/m3

lb/ft3 = 16.0185 kg/m3


Density (oil)ρoM L-3kg/m3g/cc = 103 kg/m3°API = (141.5/ SG) - 131.5
Specific gravity (oil)γ––1 = 103 kg/m31 = g/ccγ = ρ / ρw
CompressibilitycL T2 M-1Pa-1

kPa-1 = 10-3 Pa-1

psi-1 = 0.145 · 10-3 Pa-1 = 0.145 kPa-1
PermeabilitykL2m2md = 9.869233 · 10−16 m2md = 9.869233 · 10−16 m2D = 9.869233 · 10−13 m2
Porosity

φ

–fracfracfracp.u.  = % = 100 frac
Dynamic ViscosityμM L-1 T-1Pa⋅scp = 10−3 Pa⋅scp = 10−3 Pa⋅s1 P = 100 cp
ProductivityJL4 T M-1m3/(Pa·s)

cmd /kPa = 0.11574 · 10-7 m3/(Pa·s)

1 m3/(Pa·s) = 8.64 · 109 cmd / bar

bpd/psi = 0.0231 cmd /kPa

cmd /atm = 101.325 cmd /kPa = 4.394 · 103 bpd/psi

TransmissibilityσL4 T M-1m3/(Pa·s)(md·m)/cp = 9.87 · 10-13 m3/(Pa·s) (md·ft)/cp = 0.3048 (md·m)/cp

(md·m)/cp = 8.527 · 10-5 cmd/kPa = 8.64 · 10-3 cmd/atm

cmd/atm = 115.741 (md·m)/cp

Pressure diffusivityχL2 T-1m2/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 storageWBS, CSL4 T2 M-1m3/Pam3/kPa = 0.001 m3/Pa bbl/psi = 0.0231 m3/kPa
Thermal conductivityλM L T-3 Θ-1W/(m·°K)W/(m ·°C) = W/(m·°K)BTU/(hr⋅ft⋅°F) = 1.7295772 W/(m ·°C)
Specific heat capacitycpM L2 T-2 Θ-1J/(kg⋅°K)J/(kg⋅°C) = J/(kg⋅°K)BTU/(lbm⋅°F)= 4186.798188 J/(kg⋅°C)
Thermal diffusivityaL2 T-1m2/sm2/s = 0.0929 ft2/s

ft2/s = 10.764 m2/s


See also

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

http://www.petroleumoffice.com/unitconverter





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