1.1 Chemical Composition and Physical Property of Reservoir Fluid

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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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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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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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

1.1 Chemical Composition and Physical Property of Reservoir Fluid

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