PETE 310
Lecture # 17
Chapter 10 Properties of Black Oils
Reservoir Fluid Studies Lab Procedure
Fluid Properties for Reservoir Engineering Processes
The fluid properties of interest to the Reservoir Engineer are those that affect the mobility of fluids within the reservoirs these are used in material balance calculations
Properties at surface conditions for transportation and sales (API, viscosity, oil quality)
Fluid Properties for Reservoir Engineering Processes
PVT properties are determined from 5 specific lab procedures
Flash Liberation Tests (CCE)
Differential Liberation Tests (DL)
Viscosity Measurements
Separator Tests
Compositional measurements
Fluid Properties Determined
Oil PropertiesBubble Point Pressure
BoRsBtCo and mo
Gas propertiesz
Bg and mgCompositions oil & gas
Oil Sampling Procedures
Bottom hole or subsurface samples
Pros
Cons
Separator Sampling
Pros
Cons
Surface Sampling
Bottom Hole Sampling
Preserved Samples
Reservoirs Conditions
Selective Sampling Zones
Sampling early in the life of the reservoir with minimum disturbance
Lower overall cost
Oil Sampling Procedures
Separator Samples
Cheaper
SAMPLE BEFORE
RESERVOIR PRESSURE
DROPS BELOW Pb
Temperature of Test = Reservoir Temperature
Vt1
Vt2
Vt3
=V
b
Vt5
Vt4
oil oil oiloil
oil
gas gas
Hg Hg HgHg
Hg
P1
>> Pb
P2
> Pb
P3
= Pb
P4
< Pb
P5
< P4
1 2 3 4 5
Flash Vaporization Test or Constant Composition Expansion Test (CCE)
Flash Vaporization Test (CCE)
Properties determined
Pb
Co
Determination of Pb
Determination of Co
Differential Separation Test (DL)
gas
oil
oil oiloil
oil
gas
Hg
Hg
HgHg
Hg
P 1 = P b P 2 < P b P 2 < P b P 2 < P b P 3 < P 2 < P b
1 2 3 4 5
gas
oil
Gas off
Temperature of Test = Reservoir Temperature
Differential Separation Test (DL)
Temperature of Test = Reservoir Temperature
Piston.swf
Differential Separation Test
Properties Determined
Oil formation volume factor at the Bubble Point pressure Bodb and below the bubble point pressure Bod
Solution gas-oil ratio at the Bubble Point pressure Rsdband below the bubble point pressure Rsd
Isothermal compressibility (derived property)
Separator Tests
Tests performed at a combination of different Temperature and Pressure pairs
Separator Tests
Goals: Maximize API, minimize BoSb & RsSb
Optimization of Separator 2 Conditions
3160
3180
3200
3220
3240
3260
3280
3300
So
lutio
n G
as O
il R
atio
at
Pb
(R
sb
)
2.76
2.78
2.80
2.82
2.84
2.86
Fo
rma
tio
n V
olu
me
Fa
cto
r a
t P
b (
Bo
b)
50 100 150 200 250 300
Separator 2 Pressure (psia)
High Pressure Separator @ 900 psia and
TSep2
= 75oF
100 F
Nomenclature
Compositional Tests
http://www.rpi.edu/dept/chem-eng/Biotech-Environ/CHROMO/chroanim.html
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