Difference between revisions of "Composite IPR"

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(Created page with "__TOC__ == Composite Inflow Performance Relationship== thumb|right|300px|3 Phase IPR Curve <ref name=KermitBrown1984/> 3 Phase IPR calculat...")
 
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__TOC__
 
__TOC__
 
== Composite Inflow Performance Relationship==
 
== Composite Inflow Performance Relationship==
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[[File:3 Phase IPR Curve.png|thumb|right|300px|3 Phase IPR Curve <ref name=KermitBrown1984/>]]
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[[File:Composite IPR Curve.png|thumb|right|300px|Composite IPR Curve <ref name=KermitBrown1984/>]]
  
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[[3 Phase IPR]] calculates [[IPR]] curve for oil wells producing water at various [[WCUT | watercuts]].
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[[Composite IPR]] calculates [[IPR]] curve for oil wells producing water at various [[WCUT | watercuts]].
  
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[[3 Phase IPR]] equation was derived by Petrobras based on combination of [[Vogel's IPR]] equation for oil flow and constant productivity for water flow <ref name=KermitBrown1984/>.
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[[Composite IPR]] equation was derived by Petrobras based on combination of [[Vogel's IPR]] equation for oil flow and constant productivity for water flow <ref name=KermitBrown1984/>.
  
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[[3 Phase IPR]] curve is determined geometrically from those equations considering the fractional flow of oil and water  <ref name=KermitBrown1984/>.
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[[Composite IPR]] curve is determined geometrically from those equations considering the fractional flow of oil and water  <ref name=KermitBrown1984/>.
  
 
==Math and Physics==
 
==Math and Physics==
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:<math> q_{o_{max}}=q_b+\frac{JP_b}{1.8}</math><ref name=KermitBrown1984/>
 
:<math> q_{o_{max}}=q_b+\frac{JP_b}{1.8}</math><ref name=KermitBrown1984/>
  
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==[[3 Phase IPR]] calculation example==
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==[[Composite IPR]] calculation example==
 
[[File:3 Phase IPR calculation example.png|thumb|right|400px| Figure.1 [https://www.pengtools.com/pqPlot?paramsToken=73eca3000d5f28d661700c874ebcf1f1 3 Phase IPR calculation example]]]
 
[[File:3 Phase IPR calculation example.png|thumb|right|400px| Figure.1 [https://www.pengtools.com/pqPlot?paramsToken=73eca3000d5f28d661700c874ebcf1f1 3 Phase IPR calculation example]]]
 
Following the example problem #21, page 33 <ref name=KermitBrown1984 />:
 
Following the example problem #21, page 33 <ref name=KermitBrown1984 />:
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===Calculate:===
 
===Calculate:===
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Determine the [[3 Phase IPR]] curves for F<sub>w</sub>=0, 0.25, 0.5, 0.75, and 1.
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Determine the [[CompositeIPR]] curves for F<sub>w</sub>=0, 0.25, 0.5, 0.75, and 1.
 
===Solution:===
 
===Solution:===
  
 
The problem was run through [[:Category:PQplot | PQplot]] software for different values of watercut.
 
The problem was run through [[:Category:PQplot | PQplot]] software for different values of watercut.
  
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Result [[3 Phase IPR]] curves are shown on '''Fig.1'''. Points indicate results obtained by Brown <ref name=KermitBrown1984 />.
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Result [[Composite IPR]] curves are shown on '''Fig.1'''. Points indicate results obtained by Brown <ref name=KermitBrown1984 />.
  
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The  [[:Category:PQplot|PQplot]] model from this example is available online by the following link: [https://www.pengtools.com/pqPlot?paramsToken=73eca3000d5f28d661700c874ebcf1f1 3 Phase IPR calculation example]
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The  [[:Category:PQplot|PQplot]] model from this example is available online by the following link: [https://www.pengtools.com/pqPlot?paramsToken=73eca3000d5f28d661700c874ebcf1f1 Composite IPR calculation example]
  
 
== Nomenclature  ==
 
== Nomenclature  ==
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:[[IPR]]<BR/>
 
:[[IPR]]<BR/>
 
:[[Vogel's IPR]]<BR/>
 
:[[Vogel's IPR]]<BR/>
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:[[3 phase IPR]]<BR/>
 
:[[Darcy's law]]<BR/>
 
:[[Darcy's law]]<BR/>
  
 
{{#seo:
 
{{#seo:
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|title=3 Phase IPR curve
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|title=Composite IPR curve
 
|titlemode= replace
 
|titlemode= replace
 
|keywords=Inflow Performance Relationship, nodal analysis, IPR curve, IPR calculator
 
|keywords=Inflow Performance Relationship, nodal analysis, IPR curve, IPR calculator
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|description=Three-phase inflow performance relationship for oil wells producing water.
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|description= Composite inflow performance relationship for oil wells producing water.
 
}}
 
}}
  
 
[[Category:PQplot]]
 
[[Category:PQplot]]

Revision as of 06:35, 17 April 2019

Composite Inflow Performance Relationship

Composite IPR Curve [1]

Composite IPR calculates IPR curve for oil wells producing water at various watercuts.

Composite IPR equation was derived by Petrobras based on combination of Vogel's IPR equation for oil flow and constant productivity for water flow [1].

Composite IPR curve is determined geometrically from those equations considering the fractional flow of oil and water [1].

Math and Physics

Total flow rate equations:

For Pb < Pwf < Pr

For pressures between reservoir pressure and bubble point pressure:

q_t =J (P_r - P_{wf}) [1]

For PwfG < Pwf < Pb

For pressures between the bubble point pressure and the flowing bottom-hole pressures:

q_t =\frac{-C+\sqrt{C^2-4B^2D}}{2B^2}\ for B \ne 0[1]
q_t =D/C\ for B = 0[1]

where:

A=\frac{P_{wf}+0.125F_oP_b-F_wP_r}{0.125F_oP_b}[1]
B=\frac{F_w}{0.125F_oP_bJ}[1]
C=2AB+\frac{80}{q_{o_{max}}-q_b}[1]
D=A^2-80\frac{q_b}{q_{o_{max}}-q_b}-81[1]

For 0 < Pwf < PwfG

q_t =\frac{P_{wfG}+q_{o_{max}}tan(\beta)-P_{wf}}{tan(\beta)}[1]

where:

tan(\beta) = CD/CG [1]
CD = F_w\frac{0.001q_{o_{max}}}{J}+F_o0.125P_b \left ( -1+\sqrt{81-80 \frac{0.999q_{o_{max}}-q_b}{q_{o_{max}}-q_b}} \right)[1]
CG = 0.001 q_{o_{max}}[1]

And

P_{wfG}=F_w \left ( P_r - \frac{q_{o_{max}}}{J}\right )[1]
q_{o_{max}}=q_b+\frac{JP_b}{1.8}[1]

Composite IPR calculation example

Figure.1 3 Phase IPR calculation example

Following the example problem #21, page 33 [1]:

Given:

P_r = 2550 psi
P_b = 2100 psi

Test data:

P_{wf} = 2300 psi
q_t = 500 b/d

Calculate:

Determine the CompositeIPR curves for Fw=0, 0.25, 0.5, 0.75, and 1.

Solution:

The problem was run through PQplot software for different values of watercut.

Result Composite IPR curves are shown on Fig.1. Points indicate results obtained by Brown [1].

The PQplot model from this example is available online by the following link: Composite IPR calculation example

Nomenclature

A, B, C, D, tan(\beta), CD, CG = calculation variables
F_o = oil fraction, fraction
F_w = water fraction, fraction
J = productivity index, stb/d/psia
P = pressure, psia
q = flowing rate, stb/d

Subscripts

b = at bubble point
max = maximum
o = oil
r = reservoir
t = total
wf = well flowing bottomhole pressure
wfG = well flowing bottomhole pressure at point G

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 Brown, Kermit (1984). The Technology of Artificial Lift Methods. Volume 4. Production Optimization of Oil and Gas Wells by Nodal System Analysis. Tulsa, Oklahoma: PennWellBookss. 

See also

IPR
Vogel's IPR
3 phase IPR
Darcy's law
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