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Properties of Reservoir Fluids (PGE 362)
Reservoir Fluids CharacteristicsBY
DR. MOHAMMED A. KHAMIS19-4-2015
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Gas Formation Volume Factor (Bg):
The volume of gas at reservoir conditions
required to produce one standard volume of
gas at the surface condition.
Gas Properties
Reservoir Conditions
Standard Conditions
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Gas Formation Volume Factor (Bg):
π΅π =ππ πππΆ
=
π§ππ ππ
ππ πππΆπππΆ
SC: P =14.65 psia, T = 520 Β°R, z = 1.0
π΅π =πππΆπππΆ
π§π
π=
14.65
520
π§π
π= 0.0282
π§π
π
πππ ππ’ ππ‘
π ππ
π΅π = 0.00502π§π
π
πππ πππ
π ππ
π΅π = 5.02π§π
π
πππ πππ
ππ ππ
Gas Properties
Volume of an arbitrary amount
of gas at reservoir T & P
Volume at SAME amount
At standard T & P
π΅π =ππ πππΆ
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Gas Formation Volume Factor (Bg):
Typical shape of Bg
Gas Properties
Gas Formation Volume Factor
Bg
Pressure
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Gas Formation Volume Factor (Bg):
Example:A gas has a specific gravity of 0.74. Calculate its formation volume factor at 210Β° F
and 2300 psia.
Solution:
Tc = 396Β° R, Pc = 665 psia
ππ =460+210
396= 1.69, ππ =
2300
665= 3.46 , z = 0.86
π΅π = 0.00502(0.86)(670)
(2300)= 0.00126
πππ πππ
π ππ= 1.26
πππ πππ
ππ ππ
Gas Properties
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Gas Viscosity (Β΅g):
Viscosity is a measure of the resistance to flow exerted by a fluid.
Units:
Dynamic (Β΅): Poise (p) = g mas/(sec cm)
or centipoise (cp) = g mas/(100 sec cm)
SI unit : Pascal second (Pa s) = 1 kg/(m s) = 10 p
Kinematic (v): viscosity/density : centipoise/gm/cc (cp/g/cc)
Gas Properties
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Gas Viscosity (Β΅g):
Typical shape:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Gas Properties
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Gas Viscosity (Β΅g):
Correlation:
Solution:
Gas Properties
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Coefficient of Isothermal Compressibility
of Gas (cg):
The change in gas volume per change in
pressure at constant temperature.
ππ = β1
π
ππ
πππ
Gas Properties
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Coefficient of Isothermal Compressibility
of Gas (cg):
ππ = β1
π
ππ
πππ
Ideal Gas: π =ππ π
π: ππ
ππ= β
ππ π
π2
ππ = βπ
ππ πβ
ππ π
π2=
1
π
Real Gas: π =π§ππ π
π: ππ
ππ= ππ π
πππ§
ππ πβπ§
π2
ππ = βπ
π§ππ πππ π
πππ§
ππ πβπ§
π2
ππ =1
πβ
1
π§
ππ§
ππ π
Gas Properties
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Coefficient of Isothermal Compressibility
of Gas (cg):
Gas Properties
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Coefficient of Isothermal Compressibility
of Gas (cg):
Example:
Calculate the coefficient of isothermal compressibility of a dry gas with specific
gravity of 0.818 at reservoir temperature of 220Β° F and 2100 psig.
Solution:
Tpc = 406Β° R
Ppc = 647 psig
Cpr = cgppc
Gas Properties