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Black_Oil_Definitions
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PETE 310Lecture # 15Properties of Black Oils Definitions(pages 224-240)
Phase Diagram of a Black Oil Reservoir
Properties of Black Oils Needed for Reservoir Engineering Calculations:
Formation Volume Factor of oil Bo
Total Formation Volume Factor of oil Bt
Solution Gas oil Ratio Rs
Coefficient of Isothermal Compressibility Co
Properties of Black Oils Needed for Reservoir Engineering Calculations:
Coefficient of isobaric thermal expansion bo
Oil Viscosity mo
Interfacial Tension
Learning GoalsUnderstand the behavior of those PVT properties (Bo,Rs,) vs P and type of fluid (now)Evaluate PVT properties from (later)Field dataLaboratory studiesCorrelations
DefinitionsSpecific gravity of a liquid
API gravity
Definitions
Formation Volume Factor of Oil
Gas out of Solution
Definitions Volume of Oil + Dissolved gas Bo = at Reservoir Pressure & Temp. Volume of Oil entering Stock tank at Tsc, PscUnits = Reservoir barrels (bbl) /Stock tank barrels (STB)
General Shape of BoBoReservoir PressurePbReservoir T = constant
Solution Gas Oil Ratio (Rs)How much gas is dissolved in the oil volume per volume basisRs depends upon pressureUnits [= ] SCF gas /STB oil
General Shape of Solution Gas Oil Ratio (Rs)RsReservoir PressurePbReservoir T = constant
Total Formation Volume Factor BtHgOilBobBoBg(Rsb-Rs)Pb
Definition of BtAlso called Two-phase formation volume factorUnits
bbl/STB + bbl/SCF * (SCF/STB)
General Shape of BtBo, BtReservoir PressurePbReservoir T = constantBt=BoBtBo
The Coefficient of Isothermal Compressibility of OilProvides Instantaneous change of volume with P at constant TAlso with molar volume and specific volume
Coefficient of Thermal Expansion(Use in Steam Injection Processes)
Oil ViscosityViscosity is a measure of the resistance to flow exerted by a fluidThis is called dynamic viscosity and has units of centipoise = g mass / 100 sec cm Kinematic viscosity is viscosity / density, units are in centistokes = centipoise /g/cc
Needs of Crude Oil ViscosityCalculation of two-phase flowGas-lift and pipeline designCalculate oil recovery either from natural depletion or from recovery techniques such as waterflooding and gas-injection processes
Variation of Oil Viscosity Oil Viscosity T = constantPbSingle Phase Flow
Two Phase Flow