Post on 05-Apr-2018
7/31/2019 1.1 Chemical Composition and Physical Property of Reservoir Fluid
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Part Properties of Formation Fluid
of Reservoir Fluid
Properties of Natural Gas
Phase Behavior of Hydrocarbon
Property of Oilfield Water
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on on o eservo r u
Original Pressure and temperature are high.
Property of reservoir fluid is changing with
pressure and temperature.
Exploration and exploitation are in different stages
In the course of development
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ropert es o eservo r u
ru e o s n e s a e o g empera ure an
high pressure with much associated gas and formationwater. It has great differences with stock tank oil.
The property of porous medium rock determines
,
in reservoir rocks to a large extent. The physical andchemical properties of formation fluid (oil, gas and
water) also affect its performance.
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Chemical Com osition of Crude Oil
Physical Property of Crude Oil
Classification of Crude Oil
Chemical Composition of Nature Gas
Classification of Reservoir
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em ca ompos on o ru e
Crude oil is defined as a mixture of hydrocarbons
that existed in the liquid phase in natural underground
reservoirs and remains liquid at atmospheric pressure
(joint API, AAPG, and SPE).
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em ca ompos on o ru e
+
HCparaffinsnn
)(22
+ HCHCaromatics
nnnap t enesnsy rocar o
)(
undsoxygencopooilcrude _
com oundsnitro en
compoundssulfuroundsheterocomp
_
others_
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2 Physical Property of Crude Oil
1Color
, ,
and brown, to dark brown and black in color.
The physical and chemical properties of crude oils varyThe physical and chemical properties of crude oils vary
considerably and are dependent on the concentration of theconsiderably and are dependent on the concentration of the
var ous ypes o y rocar ons an m nor cons uen s presenvar ous ypes o y rocar ons an m nor cons uen s presen
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2 Physical Property of Crude Oil
2Density and specific gravity
The crude oil density is defined as the mass of a unit
temperature.
o
ooV=
lb/ft3 in English unit
In international standardkg/m3
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2 Physical Property of Crude Oil
2Density and specific gravity
The specific gravity of a crude oil is defined as the ratioof the density of the oil to that of water.
w
o
o
=
o = specific gravity of the oil
o = density of the crude oil, lb/ft3
w = density of the water, lb/ft3
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2Density and specific gravity
The API gravity is the preferred gravity scale. usuallyrange from 47oAPI for the lighter crude oils to 10oAPI
for the heavier as haltic crude oils.
5.131.
=o API
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3Solidifying point
The solidifying point of crude oil is defined as the
the state of flowing to immobilizing. It is affected by the
content of wax, asphalt, colloid, light oil.
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4Crude oil viscosity
The viscosity, in general, is defined as the internal
.
Crude oil viscosity is an important physical propertythat controls and influences the flow of oil through
porous media and pipes.
un a.s
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3 Classification of Crude oil
1 Based on sulfur content
. ccor ng to propert es o tan o
(1 low sulfur oilsulfur content is 0.5 below
2 sulfur crude (skunk oil)between 0.5% and 2.0%
.
2 Based on the content of colloid- asphaltene
-
(2) colloid oilbetween 8% and 25
(3) high colloid oil25 above
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5 Based on the specific gravity of stock tank oil
1light oilo0.855
2medium oil 0.855 o0.934
o .
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3.2 According to formation crude oil
1low viscosit oil mPa .
3 hi h our oint crude hi h wax contentlight oil, solidifying point is more than 40
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4 Chemical composition of natural gas
Natural gas , petroleum gas hydrocarbon, is a mixture
o y rocar on an non- y rocar on gases
, , , , ,
small amounts of hexanes and heavier. C1 mole% >70
~98 C2 mole%< 10
The non-hydrocarbon gases (i.e., impurities) include
, ,
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5 Classification of reservoir
Geologic characteristic
Fluid properties
Natural drive or drive type
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Oil reservoi rsSecond
Gas reservoirs
Black oil Light oil condensate
3rd
Ordinary gas
reservoirs reservoirs gas reservoirs reservoirs
Heavy oi l
reservoirs
Ordinary
black oil
reservoirHighshrinkage
Volatile Highcondensate
Low
Rich
gas
Dry
gas
con ensa e
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gas reservoirs
condensate gas reservoirs
oil reservoirs
heavy oil reservoirs
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Mole component and physical property of typicalformation fluid
C 1 % 4 8 .8 3 6 4 .3 6 8 7 .0 1 9 5 .8 5C 2 %
C 3 %
2 . 7 5
1 . 9 3
7 . 5 2
4 . 4 7
4 . 3 9
2 . 2 9
2 . 6 7
0 . 3 4
4
C 5 %
C 6 %
.
1 . 1 5
1 . 5 9
.
2 . 9 7
1 . 3 8
.
0 . 8 3
0 . 6 0
.
0 . 0 8
0 . 1 2
C 7 % 4 11 5 1 4 .9 1 3 .8 0 0 .4 2
% 1 0 0 .0 0 1 0 0 .0 0 1 0 0 .0 0 1 0 0 .0 0
C 7 +
m 3 m 3
2 2 5
111
1 8 1
3 5 6
11 2
3 2 4 0
1 5 7
1 8 6 9 0
g cm 3
0 . 8 5 3 4
0 . 7 7 9 2
0 . 7 3 5 8
0 . 7 5 9 9
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Based on the buried depth
less than 1500m shallow
m sem - eep
2800 4000m deep
more than 4000m ultra deep