Difference between revisions of "P/Z plot"
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[[P/Z plot]] is a part of the [[Reservoir Management]] workflow in the [[:Category:E&P Portal | E&P Portal]] used to estimate [[Reservoirs]] GIIP and recovery. | [[P/Z plot]] is a part of the [[Reservoir Management]] workflow in the [[:Category:E&P Portal | E&P Portal]] used to estimate [[Reservoirs]] GIIP and recovery. | ||
| − | '''Example 1. Multiple Reservoirs on the same [[P/Z plot]]''' | + | '''Example 1. Multiple Reservoirs on the same [[P/Z plot]]''' in the [[:Category:E&P Portal | E&P Portal]] |
[[File:Poverz_multiple_reservoirs.png]] | [[File:Poverz_multiple_reservoirs.png]] | ||
| + | |||
[[Gas Flowing Material Balance]] is the more advanced tool to determine the [[Reservoirs]] GIIP and recovery as well as [[Well]]'s [[EUR]] and [[JD]]. | [[Gas Flowing Material Balance]] is the more advanced tool to determine the [[Reservoirs]] GIIP and recovery as well as [[Well]]'s [[EUR]] and [[JD]]. | ||
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# Upload the data required | # Upload the data required | ||
# Go to the [[Reservoir Management]] -> [https://ep.pengtools.com/reservoir/plots Performance Plots] | # Go to the [[Reservoir Management]] -> [https://ep.pengtools.com/reservoir/plots Performance Plots] | ||
| − | # Select the | + | # Select the [[Reservoirs]] you want to see and the Data range and click "Search" |
# Scroll down the Performance Plots to see the [[P/Z plot]] | # Scroll down the Performance Plots to see the [[P/Z plot]] | ||
=== Data Required=== | === Data Required=== | ||
| + | {{Data required for Reservoir Management}} | ||
| + | |||
| + | == See also == | ||
| + | [[Gas Flowing Material Balance]]<BR/> | ||
| + | [[Gas Material Balance]]<BR/> | ||
== Nomenclature == | == Nomenclature == | ||
| Line 69: | Line 75: | ||
[[Category:Reservoir Management]] | [[Category:Reservoir Management]] | ||
[[Category:E&P Portal]] | [[Category:E&P Portal]] | ||
| + | |||
| + | {{#seo: | ||
| + | |title=P/Z plot to estimate reservoirs GIIP | ||
| + | |titlemode= replace | ||
| + | |keywords=giip calculation, reservoir engineering, material balance, petroleum engineering | ||
| + | |description=P/Z plot is and quick and easy to use tool to estimate reservoirs GIIP. | ||
| + | }} | ||
Latest revision as of 05:22, 8 November 2018
Contents
Brief
The P/Z plot is a plot of P/z versus Reservoir cumulative gas production, Gp.
The interpretation technique is fitting the data points with the straight line to estimate GIIP.
The P/Z plot is based on the Gas Material Balance equation.
Math & Physics
Applying Real Gas EOS at reservoir conditions:
(1)
Applying Real Gas EOS at standard conditions:
(2)
Dividing eq. 2 by eq. 1 and rearranging:
(3)
Applying eq. 3 for initial conditions and for any point in time:
Applying eq. 3 for any point in time:
Therefore at any time:
Or:
Thus a plot of P/z vs cumulative produced gas is a straight line intersecting X axis at GIIP.
Discussion
P/Z plot is a part of the Reservoir Management workflow in the E&P Portal used to estimate Reservoirs GIIP and recovery.
Example 1. Multiple Reservoirs on the same P/Z plot in the E&P Portal
Gas Flowing Material Balance is the more advanced tool to determine the Reservoirs GIIP and recovery as well as Well's EUR and JD.
Workflow
- Upload the data required
- Go to the Reservoir Management -> Performance Plots
- Select the Reservoirs you want to see and the Data range and click "Search"
- Scroll down the Performance Plots to see the P/Z plot
Data Required
- Create Field here
- Upload Wells
- Create or Upload Reservoirs here
- Upload Monthly Measures here
- Input the Reservoirs reserves and other data here
- Create or Upload PVT (SG, Pi, Ti) here
In case you need to calculate the Monthly Measures from the Daily Measures:
- Upload Wells
- Upload Daily Measures
- Calculate the Monthly Measures using Monthly Measures Calculator
See also
Gas Flowing Material Balance
Gas Material Balance
Nomenclature
= gas initially in place, scf
= cumulative gas produced, scf
= reservoir pressure (changing), psia
= initial reservoir pressure (constant), psia
= pressure at standard conditions, psia
= initial reservoir temperature (constant), °R
= reservoir temperature (constant), °R
= temperature at standard conditions (constant), °R
= volume of gas in reservoir converted to standard conditions (changing), scf
= reservoir volume (constant), ft3
= gas compressibility factor (changing), dimensionless
= initial gas compressibility factor (constant), dimensionless
