Environmental Engineering Reference
In-Depth Information
Based on the proposed separation of produced oil into separate components,
the average integral value of the physico-chemical properties of produced oil
X
з
for counting of reserves must be found from the expression:
X
⋅
m
+
X
⋅
m
+
X
⋅
m
+
X
⋅
m
из
из
нз
нз
с
с
Ц
Ц
X
=
з
М
;
(5.4)
з
М
=
m
+
m
+
m
+
m
з
из
нз
с
Ц
(5.5)
or
X
=
X
d
+
X
d
+
X
d
+
X
d
(5.6)
з
из
из
нз
нз
c
с
Ц
Ц
where, - the mean of the integral value of the correspond-
ing component of reservoir oil;
- the mass fraction of the cor-
responding component of reservoir oil
,
where,
m
- The mass of
i
component of reservoir oil;
m
∋
- The mass of reservoir
oil (geological reserves of oil reservoir).
Equations (5.4) and (5.6) allow us to calculate the average integral value of
the physicochemical properties of reservoir oil by using a different source (rela-
tive or absolute).
The average integral value of the physicochemical properties of mobile oil-
for use in the calculation of oil displacement processes must be found out of the
expression:
Xm
.
X m
.
X
=
u
3
u
3
+
H H
3
3
n
m
m
;
(5.7)
n
n
or
X Xc X c
=
.
+
.
(5.8)
n
u
3
u
3
H H
3
3
where, - property value and the mass fraction of compo-
nent of recovered part of mobile oil, respectively; - Property
value and the mass fraction of component of non-removable part of mobile oil,
respectively.
In practice, there are a number of contradictions in the calculation methods of
geological reserves of hydrocarbons and the calculation of oil recovery processes.
For example, an anachronism in the method of counting, which is based on the
volume (sealer) ratio of produced oil, because the value of reserves is obtained
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