PROPERTIES OF BLACK OILS - Petroleum Reservoir Fluid Property Correlations - page 129

N p Cumulative oil production, STB

p Pressure, psia

p b Bubblepoint pressure, psia, equation (3.7a)

p i Initial reservoir pressure, psia

p r Pressure ratio, (p - 14.7)/( p b - 14.7), psig/psig, equation (3.8c)

p SP Separator pressure, psia

r Radial distance, ft

R s Solution gas-oil ratio, scf/STB, equation (3.8a)

R sb solution gas-oil ratio at bubblepoint pressure, scf/STB,

equation (3.1)

R sr Reduced solution gas-oil ratio, R s / R sb , equation (3.8b)

R SP Separator producing gas-oil ratio, scf of SP gas/STB

R ST Stock-tank producing gas-oil ratio, scf of ST gas/STB,

equation (3.2a)

S o Oil saturation, fraction of pore space

S w Water (brine) saturation, fraction of pore space

t Time, hours

T Temperature, ºF

T R Reservoir temperature, ºF

T SP Separator temperature, ºF

V Volume

VAR n Independent variable in various equations

W e Cumulative water (brine) encroached into reservoir from

aquifer, res bbl

W p Cumulative water (brine) production, STB

Z Summation of transforms of independent variables in various

equations

Z n Transforms of independent variables in various equations