Petroleum engineering
Oil and gas quantities from the general catalogue, with the units common in the field listed first.
Quantities
Production rate
Stock-tank barrels, cubic metres and standard cubic feet per day.
stb/d, bbl/d, m³/d, scf/d, mscf/d
Reservoir pressure
Wellbore and reservoir pressure.
psi, bar, kPa, MPa
Permeability
Millidarcies, darcies and square micrometres.
mD, D, µm²
Viscosity
Dynamic viscosity of reservoir fluids.
cP, mPa.s, Pa.s
API gravity
Degrees API, from the density of crude oil.
°API
Density
Mass per volume of produced fluids.
kg/m3, g/cm3, lbm/gal[US], lbm/ft3
Gas-oil ratio
Gas volume per volume of stock tank oil.
SCF/STB, MSCF/STB, STB/MSCF