03. Crude oil properties(1st
part)
In first
we should treat the properties of oil and once finished we would treat gas
properties.
Crude Oil properties :
Is defined
as the mass per unit volume at a specified pressure and temperature
(P,T).
It depends
of the ratio of resino-asphaltic compound and also it depends on the
ratio of solution gas contained in a volume of oil because when we have oil which
ratio of solution gas contained in a volume of oil because when we have oil which
contains
:
-
A lot of
resino-asphaltic compounds so the relative density will be higher .
-
A lot of
solution gas so the relative density will be lower.
We can now
extend density to relative density by dividing the density upon the density of
water (reference of liquids) which should be considered in the same
temperature and pressure of oil
The values
of relative density are between 0,8 – 0,95 but we
have exception for this rule for example :
-
Bakou γ=0,7
-
Iran γ=1,016
-
California
γ=1,01
In fact
the most used are neither density nor relative density but it is API gravity which
is equal to :
- 2. Viscosity :
Is the resistance of oil to flow , it’s unit is centipoises
Viscosity depends on three mainly parameters :
2.1.
Temperature:
Temperature is inversely proportional to viscosity .
2.2.
Solution gas:
Solution gas quantity is inversely proportional to
viscosity.
2.3.
Densite :
Densite is
proportional to viscosity.
For oil viscosity is between 0,7-3000 Cp0
some exemples of oil viscosities are as follows :
-
Gabon oil
is between 200-600 Cp0
-
Algeria
oil fields have an average of 2Cp0
3. Formation Volume Factor :
Is the ratio between
a volume at reservoir condition upon a volume at standard
condition.
This parameter is
very important when we want to estimate our reserves of oil
Remarks
3.1.
B0 is always >1 since
reservoir temperature is greater than 15,6°C
3.2.
At bubble point B0 is maximum.
Aucun commentaire:
Enregistrer un commentaire