In Petroleum industry there are two major unit systems: Oil Metric (based
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on SI units)
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and Oil Field (based
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on Imperial units).
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Both Oil Metric
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and Oil Field have deviations from their original basement systems.
| Symbol | Dimension | SI | Oil Metric | Oil Field | Additional | |
|---|---|---|---|---|---|---|
| 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 | ac = 4,047 m2 | ha = 10,000 m2 = 2.471 ac |
| Volume | V | L3 | m3 | m3 = 6.289811 bbl | ||
| Mass / Weight | M, m | M | kg | kg | lb = 0.45359237 kg | g = 10-3 kg |
| 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 |
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| 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 | m3/d = cmd = 1.16 · 10-5 m3/s | bpd = 0.184 · 10-5 m3/s = 0.159 m3/d | |
| Volumetric flow rate (gas) | qg, Qg | L3 T-1 | m3/s | m3/d = cmd = ??? | scf/d = ft3/d = ??? | |
| GOR | Yg | – | m3/m3 | m3/m3 = ??? | scf/bbl = ??? | |
| Density (solids) | ρ | M L-3 | kg/m3 | g/cc = 103 kg/m3 | g/cc = 103 kg/m3 | |
| Density (oil) | ρo | M L-3 | kg/m3 | g/cc = 103 kg/m3 | °API = (141.5/ γo) - 131.5 | |
| Specific Gravity | 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 = 9.869233×10−7 m2 | md = 9.869233×10−7 m2 | D = 9.869233×10−13 m2 |
| 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) | m3/(d·kPa) = ??? | bpd/psi = ??? | m3/(d·atm) = ??? |
| Transmissibility | σ | L4 T M-1 | m3/(Pa·s) | (md·m)/cp = ??? | (md·ft)/cp = ??? | m3/(d·atm) =??? |
| Pressure diffusivity | χ | L2 T-1 | m2/s | (md·kPa)/cp = ??? | (md·psi)/cp = ??? | (md·atm)/cp = ??? |
| Wellbore storage | WBS, CS | L4 T2 M-1 | m3/Pa | m3/kPa = ??? | bbl/psi = ??? | |
| Thermal conductivity | λ | M L T-3 Θ-1 | W/(m·K) | W/(m·°C) = ??? | BTU/(hr⋅ft⋅°F) = ??? | |
| Specific heat capacity | cp | M L2 T-2 Θ-1 | J/K | kJ/°C = ??? | kJ/°F = ??? | |
| Thermal diffusivity | a | L2 T-1 | m2/s | m2/s |
Reference
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