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 TẬP ĐOÀN DẦU KHÍ VIỆT NAMTRƯỜNG ĐẠI HỌC DẦU KHÍ VIỆT

NAM

Constant-Composition Expansion

Test (CCE)

Lecturer : Nguyen Viet Khoi Nguyen, MSc.Group CCE : Vu Van Long (Leader)

  Vu Xuan Van  Nguyen Quang Khai

  ran !huong

  Nguyen Van hu

  Nguyen "a #oang Linh

  ran Xuan ruong 

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PVT Overview

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!V repre$ent$ the %eha&iour o' hydrocar%on re$er&oir 'uid$ (i.e.,

oi, ga$, ater) during i'e o' the 'ied, a$ e a$ e''ect o' change$ in

te*perature and pre$$ure during 'uid tran$'er 'ro* re$er&oir to

$ur'ace+proce$$ing 'aciitie$.

outine !V $tudie$ nor*ay co&er the 'ooing a%oratory te$t:

1. Compositional analysis of the system

2. Constant-composition expansion

. !ifferential li"eration (vapori#ation) test

$. %eparator tests

&. Constant-vol'me epletion

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Constant-Composition Expansion

!urpo$e:  - Saturation pre$$ure (%u%%e-point and de-point pre$$ure)

  - $other*a co*pre$$i%iity coe''icient$ o' the $inge-pha$e-

'uid in e/ce$$ o' $aturation pre$$ure

  - Co*pre$$i%iity 'actor$ o' the ga$ pha$e

  - !re$$ure-Vou*e reation$ o' the$e hydrocar%on$ ( Vhc*(P) )

0%1ect:

  - Ga$ conden$ate

  - Crude oi

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4

Comparison

Characteris-

tic

Constant-

composition

expansion

!ifferential

li"eration test

%eparator test Constant-vol'me

epletion

Primary

p'rpose

2eter*ine

 pre$$ure-

&ou*e

reation

2e$cri%e the

$eparation proce$$

in re$er&oir 

Determine the

changes in

the volumetric

behavior of

the reservoirfluid.

Provides a variety of

useful important

information needed in

reservoir engineering

calculations.

 O"+ect Ga$

conden$ateand crude oi

Ga$ conden$ate

and crude oi

0rigina oi Ga$ conden$ate and

&oatie oi

Conition of 

%im'lation

!3!i

4re$er&oir 

 !4! %

4re$er&oir 

 !4! %

4re$er&oir 

 !4!d

4re$er&oir 

 ,eas're

parameters

eati&e

&ou*e(Vre)5 0i

'actor

"od, "td, 6, "g

Vou*e 'actor

"o''%,  $'%,Soution ga$-oi

Cu*uati&e &ou*e o'

 produced ga$ (G p), zd, zi,sl, n , z

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Process CCE

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Process CCE

6

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Correctin CCE !ata

7-'unction: (V 8)

 sat 

rel 

 P P Y 

 P 

−=

× −

!$at: $aturation pre$$ure, p$ia

 p: pre$$ure, p$ia

Vre: reati&e &ou*e at pre$$ure p

Y a bP  = +

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Correctin CCE !ata

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%at'ration press're

Pressure at which vapor and liquid are in equilibrium. For

oils, equal to the bubble point. For condensates, the dewpoint.

Bubble-point pressure !n their original condition, reservoiroils include some natural gas in solution. "he pressure at

which this natural gas begins to come out of solution and

form bubbles.

Dew-point pressure "he pressure at which liquids begin to

condense from the vapor phase in a gas stream.

9

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%at'ration press're

10

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sothermal Compressi"ility Coefficients

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 sothermal Compressi"ility Coefficients

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!etermine as compressi"ility

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Cacuate the co*pr$e$$i%iity 'actor a t pre$$ure p (9) 'ro* the

co*pre$$i%iity at pre$$ure p (9):

' the co*pre$$i%iity 'actor i$ *ea$ured at de-point !d:

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!etermine as compressi"ility

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!ro%e*: Cacuate the de&iation 'actor at pre$$ure a%o&e de

 point

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!etermine as compressi"ility

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!etermine as compressi"ility

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Total hyrocar"on vol'me

17

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!etermine ensity at any press're

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 #bove pubble point pressure

Below pubble point pressure

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