Environmental Engineering Reference
In-Depth Information
3
Reservoir Fluid Properties
PVT Refresher Course
For a complete understanding of the behavior of producing wells, it is necessary to
keep in mind the fundamental principles that govern the properties of hydrocarbon
liquids and gases. Only then can downhole flow rates be accurately found from
surface flow rates. The correct choice of a flowmeter tool depends on the expected
flow rate and whether or not free gas is present will influence the choice of a fluid-
typing tool. In order to keep clear the different sets of conditions of pressure,
volume, and temperature, subscripts will be used in this text as follows:
b
Bubble-point
bc
Brine concentration
g
Gas
o
Oil
s
Solution
sc
Standard conditions
w
Water
wf
Well flowing conditions (at depth)
Additionally, the following symbols will be used:
C Concentration
ˁ
Density
q
Flow rate
B
Formation volume factor
R
Gas/oil ratio or solubility
p
Pressure
ʳ
Specific gravity
T
Temperature
ʼ
Viscosity
 
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