Difference between revisions of "Dranchuk correlation"

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__TOC__
 
__TOC__
  
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=== Brief ===
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== Dranchuk gas compressibility factor correlation ==
  
 
[[Dranchuk correlation]] is the fitting equation of the classic '''Standing and Katz''' <ref name=Standing&Katz /> [[gas compressibility factor]] correlation.
 
[[Dranchuk correlation]] is the fitting equation of the classic '''Standing and Katz''' <ref name=Standing&Katz /> [[gas compressibility factor]] correlation.
  
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=== Math & Physics ===
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== Math & Physics ==
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:<math> z =  1-z+
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:<math> z =  1 +
 
\left(A_1
 
\left(A_1
 
  +\frac{A_2}{T_{pr}}
 
  +\frac{A_2}{T_{pr}}
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where:
 
where:
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 +
:<math>  \rho_r = \frac{0.27\ P_{pr}}{{z\ T_{pr}}}  </math>
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:<math>  P_{pr} =  \frac{P}{P_{pc}}</math>
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 +
:<math>  T_{pr} =  \frac{T}{T_{pc}}</math>
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 +
 
A1 = 0.3265<br/>
 
A1 = 0.3265<br/>
 
A2 = –1.0700<br/>
 
A2 = –1.0700<br/>
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A11 = 0.7210<br/>
 
A11 = 0.7210<br/>
  
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:<math>  \rho_r = \frac{0.27\ P_{pr}}{{z\ T_{pr}}}  </math>
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== Discussion  ==
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:<math>  P_{pr} =  \frac{P}{P_{pc}}</math>
 
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:<math>  T_{pr} =  \frac{T}{T_{pc}}</math>
 
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=== Discussion  ===
 
 
Why the [[Dranchuk correlation]]?
 
Why the [[Dranchuk correlation]]?
  
 
{{Quote| text = It's classics! | source = www.pengtools.com}}
 
{{Quote| text = It's classics! | source = www.pengtools.com}}
  
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=== Workflow  ===
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== Workflow  ==
 
To solve the [[Dranchuk correlation| Dranchuk]] equation use the iterative secant method.
 
To solve the [[Dranchuk correlation| Dranchuk]] equation use the iterative secant method.
  
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:<math>  T_{pc} =  ( 99.3+180\ SG_g-6.94\ SG^2_g ) \times 1.8 </math>
 
:<math>  T_{pc} =  ( 99.3+180\ SG_g-6.94\ SG^2_g ) \times 1.8 </math>
  
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=== Application range ===  
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== Application range ==  
  
 
:<math>  0.2 \le P_{pr} < 30 ; 1.0 < T_{pr} \le 3.0 </math><ref name= Dranchuk/>
 
:<math>  0.2 \le P_{pr} < 30 ; 1.0 < T_{pr} \le 3.0 </math><ref name= Dranchuk/>
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:<math>  P_{pr} < 1.0 ; 0.7 < T_{pr} \le 1.0</math><ref name= Dranchuk/>
 
:<math>  P_{pr} < 1.0 ; 0.7 < T_{pr} \le 1.0</math><ref name= Dranchuk/>
  
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=== Nomenclature ===
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== Nomenclature ==
 
:<math> A_1..A_{11} </math> = coefficients
 
:<math> A_1..A_{11} </math> = coefficients
 
:<math> \rho_r </math> = reduced density, dimensionless
 
:<math> \rho_r </math> = reduced density, dimensionless
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:<math> z </math> = gas compressibility factor, dimensionless
 
:<math> z </math> = gas compressibility factor, dimensionless
  
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=== References ===
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== References ==
 
<references>
 
<references>
  
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{{#seo:
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|title=Dranchuk correlation
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|title=Dranchuk gas compressibility factor correlation
 
|titlemode= replace
 
|titlemode= replace
 
|keywords=Dranchuk correlation
 
|keywords=Dranchuk correlation
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|description=Dranchuk correlation is the fitting equation of the classic '''Standing and Katz''' gas compressibility factor correlation.
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|description=Dranchuk correlation is the fitting equation of the classic Standing and Katz gas compressibility factor correlation.
 
}}
 
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Latest revision as of 21:29, 23 November 2023

Dranchuk gas compressibility factor correlation

Dranchuk correlation is the fitting equation of the classic Standing and Katz [1] gas compressibility factor correlation.

Math & Physics

z = 1 + \left(A_1 +\frac{A_2}{T_{pr}} +\frac{A_3}{T^3_{pr}} +\frac{A_4}{T^4_{pr}} +\frac{A_5}{T^5_{pr}} \right)\ \rho_r+ \left(A_6 +\frac{A_7}{T_{pr}} +\frac{A_8}{T^2_{pr}} \right)\ \rho^2_r -A_9\ \left(\frac{A_7}{T_{pr}}+\frac{A_8}{T^2_{pr}}\right) \rho^5_r +A_{10}\ \left(1+A_{11}\ \rho^2_r\right)\ \frac{\rho^2_r}{T^3_{pr}} \ e^{(-A_{11}\ \rho^2_r)} [2]

where:

\rho_r = \frac{0.27\ P_{pr}}{{z\ T_{pr}}}
P_{pr} = \frac{P}{P_{pc}}
T_{pr} = \frac{T}{T_{pc}}


A1 = 0.3265
A2 = –1.0700
A3 = –0.5339
A4 = 0.01569
A5 = –0.05165
A6 = 0.5475
A7 = –0.7361
A8 = 0.1844
A9 = 0.1056
A10 = 0.6134
A11 = 0.7210

Discussion

Why the Dranchuk correlation?

It's classics!
— www.pengtools.com

Workflow

To solve the Dranchuk equation use the iterative secant method.

To find the pseudo critical properties from the gas specific gravity [1]:

P_{pc} = ( 4.6+0.1\ SG_g-0.258\ SG^2_g ) \times 10.1325 \times 14.7
T_{pc} = ( 99.3+180\ SG_g-6.94\ SG^2_g ) \times 1.8

Application range

0.2 \le P_{pr} < 30 ; 1.0 < T_{pr} \le 3.0 [2]

and

P_{pr} < 1.0 ; 0.7 < T_{pr} \le 1.0[2]

Nomenclature

A_1..A_{11} = coefficients
\rho_r = reduced density, dimensionless
P = pressure, psia
P_{pc} = pseudo critical pressure, psia
P_{pr} = pseudoreduced pressure, dimensionless
SG_g = gas specific gravity, dimensionless
T = temperature, °R
T_{pc} = pseudo critical temperature, °R
T_{pr} = pseudoreduced temperature, dimensionless
z = gas compressibility factor, dimensionless

References

  1. ↑ 1.0 1.1 Standing, M. B.; Katz, D. L. (December 1942). "Density of Natural Gases"Free registration required. Transactions of the AIME. Society of Petroleum Engineers. 146 (SPE-942140-G). 
  2. ↑ 2.0 2.1 2.2 Dranchuk, P. M.; Abou-Kassem, H. (July 1975). "Calculation of Z Factors For Natural Gases Using Equations of State"Free registration required. The Journal of Canadian Petroleum. 14 (PETSOC-75-03-03). 


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