Properties of Reservoir Fluids (PGE 362) -...
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Properties of Reservoir Fluids ( PGE 362) Reservoir Fluids Characteristics BY DR. MOHAMMED A. KHAMIS 26-4-2015
Transcript of Properties of Reservoir Fluids (PGE 362) -...
Properties of Reservoir Fluids (PGE 362)
Reservoir Fluids CharacteristicsBY
DR. MOHAMMED A. KHAMIS26-4-2015
Specific Gravity (πΎπ ):
πΎπ =ππππ€
Β°π΄ππΌ =141.5
πΎπβ 131.5
πΎπ =141.5
131.5 + π΄ππΌ
Black Oil Properties
Specific Gravity (πΎπ ):
Example 8-1 (McCain book, page 225):
Solution:
Black Oil Properties
Oil Formation Volume Factor (Bo):
Black Oil Properties
Reservoir (P,T)
Gas out of Solution
Surface (Ps,Ts)
Oil Formation Volume Factor (Bo):The volume of reservoir oil required to produce one barrel of oil in the stock tank.
π΅π =π£πππ’ππ ππ πππ + πππ π πππ£ππ πππ ππππ£πππ πππ πππ£πππ ππ‘ πππ πππ£πππ ππππππ‘ππππ
π£πππ’ππ ππ πππ πππ‘πππππ π π‘πππ π‘πππ ππ‘ π π‘ππππππ ππππππ‘ππππ
Units: res bbl/STB
Factors affecting oil volume change:1. Gas evolution
2. Pressure reduction
3. Temperature reduction
Black Oil Properties
Oil Formation Volume Factor (Bo):Typical shape (Bo vs. Pressure):
When the value of Bo = 1.0 res bbl/STB?
ππ =1
π΅π?
Search for:
The temperature effect on Bo ! (to be
discussed next class)
Black Oil Properties
Oil Formation Volume Factor (Bo):Example 8-2 (McCain book, page 226):
Solution:
π΅π =400 πππ ππ
274 ππ ππ= 1.46
πππ πππ
πππ΅
Black Oil Properties
Oil Formation Volume Factor (Bo):Correlation:
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Solution Gas Oil Ratio (Rs):The quantity of gas dissolved in oil at reservoir conditions. It is the amount of gas that evolves
from the oil as the oil is transported from the reservoir to the surface conditions.
π π =π£πππ’ππ ππ πππ πππππ’πππ ππ‘ π‘βπ π π’πππππ ππ‘ π π‘ππππππ ππππππ‘ππππ
π£πππ’ππ ππ πππ πππ‘πππππ π π‘πππ π‘πππ ππ‘ π π‘ππππππ ππππππ‘ππππ
π ππ
πππ΅
Black Oil Properties
Solution Gas Oil Ratio (Rs):Typical shape (Rs vs. Pressure):
Search for:
The temperature effect on Rs ! (to be
discussed next class)
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Solution Gas Oil Ratio (Rs):Correlation:
Black Oil Properties
Solution Gas Oil Ratio (Rs):Example 8-3 (McCain book, page 229):
Calculate the solution gas oil ratio of the reservoir liquid of the previous example
(Example 8-2).
Solution:
π π =π£πππ’ππ ππ πππ πππππ’πππ ππ‘ π‘βπ π π’πππππ ππ‘ π π‘ππππππ ππππππ‘ππππ
π£πππ’ππ ππ πππ πππ‘πππππ π π‘πππ π‘πππ ππ‘ π π‘ππππππ ππππππ‘ππππ
π ππ
πππ΅
π π =1.21 π ππ
274 ππ ππ 6.2898 Γ 10β6 πππ/ππ= 702
π ππ
πππ΅
Black Oil Properties
Total Formation Volume Factor (Bt):
Black Oil Properties
Total Formation Volume Factor (Bt):Also two-phase formation volume factor.
π΅π‘ = π΅π + π΅π π π π β π π
Units: bbl/STB + bbl/scf (scf/STB) = bbl/STB
Black Oil Properties
Total Formation Volume Factor (Bt):Typical shape (Bt vs. Pressure):
Search for:
The temperature effect on Bt ! (to be
discussed next class)
Black Oil Properties
Total Formation Volume Factor (Bt):Example 8-4 (McCain book, page 230):
Solution:
Bt = ???
Black Oil Properties
The Coefficient of Isothermal Compressibility of Oil (Co):The instantaneous change of volume with pressure at constant temperature.
Also called Oil Compressibility.
πΆπ = β1
π
ππ
πππ
With molar volume:
πΆπ = β1
ππ
πππππ
π
Or;
πΆπ = β1
π΅π
ππ΅πππ
π
Black Oil Properties
The Coefficient of Isothermal Compressibility of Oil (Co):Above bubble point pressure:
πΆπ = β1
π
ππ
πππ
πΆπ π2 β π1 = β lnπ2π1
π2 = π1 ππΆ0 π1 β π2
Black Oil Properties
The Coefficient of Isothermal Compressibility of Oil (Co):Above bubble point pressure
Example 8-4 (McCain book, page 233):
Solution:
πΆπ π2 β π1 = β lnπ2π1
, πΆπ = βlnπ2π1
π2 β π1
πΆπ = βππ
60.3759.55
4014.7 β 5014.7= 13.68 Γ 10β6 ππ πβ1
Black Oil Properties
The Coefficient of Isothermal Compressibility of Oil (Co):Below bubble point pressure:
πΆπ = β1
π΅π
ππ΅πππ
π
+π΅π
π΅π
ππ π ππ
π
Black Oil Properties
Oil Viscosity (Β΅o):The measure of the resistance to flow exerted by a fluid.
Dynamic viscosity:
Units: (centipoise = g mass / 100 sec cm)
Kinematic viscosity: viscosity / density
Units: centistokes = centipoise /g/cc
Black Oil Properties
Oil Viscosity (Β΅o):Typical shape (Β΅o vs. Pressure):
Search for:
The temperature effect on Bt ! (to be
discussed next class)
Black Oil Properties
Oil Viscosity (Β΅o):Importance:
β’ Calculation of two-phase flow
β’ Gas-lift and pipeline design
β’ Calculation of oil recovery either from natural depletion or from recovery
techniques such as water flooding and gas-injection processes
Black Oil Properties
Oil Viscosity (Β΅o):Importance:
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Oil Viscosity (Β΅o):Importance:
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