Difference between revisions of "P/Z plot"
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=== Data Required=== | === Data Required=== | ||
| + | |||
| + | *Create [[Field]]s | ||
| + | *Upload [[Reservoirs]] | ||
| + | *Upload [[PVT]] | ||
| + | *Upload [[Well]]s | ||
| + | *Upload [[Monthly Measures]] | ||
* Create [[Field]] [https://ep.pengtools.com/field/index here] | * Create [[Field]] [https://ep.pengtools.com/field/index here] | ||
* Upload [[Well]]s [https://ep.pengtools.com/well/upload here] | * Upload [[Well]]s [https://ep.pengtools.com/well/upload here] | ||
| − | * [[ | + | * Upload [[Monthly Measures]] [https://ep.pengtools.com/monthly/measures/upload here] |
* Create or Upload [[Reservoirs]] [https://ep.pengtools.com/reservoir/index here] | * Create or Upload [[Reservoirs]] [https://ep.pengtools.com/reservoir/index here] | ||
* Input the [[Reservoirs]] GIIP [https://ep.pengtools.com/reservoir/index here] | * Input the [[Reservoirs]] GIIP [https://ep.pengtools.com/reservoir/index here] | ||
* Create or Upload [[PVT]] (SG, Pi, Ti) [https://ep.pengtools.com/pvt/index here] | * Create or Upload [[PVT]] (SG, Pi, Ti) [https://ep.pengtools.com/pvt/index here] | ||
| − | |||
| − | |||
| − | In case you need to calculate the | + | In case you need to calculate the [[Monthly Measures]] from the [[Daily Measures]]: |
| − | + | * [[Upload Daily Measures]] | |
| − | + | * Calculate the [[Monthly Measures]] using [https://ep.pengtools.com/monthly/measures/recalculate Monthly Measures Calculator] | |
| − | |||
| − | |||
| − | * | ||
| − | * Calculate [[Monthly | ||
== Nomenclature == | == Nomenclature == | ||
Revision as of 13:07, 13 December 2017
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 Fields
- Upload Reservoirs
- Upload PVT
- Upload Wells
- Upload Monthly Measures
- Create Field here
- Upload Wells here
- Upload Monthly Measures here
- Create or Upload Reservoirs here
- Input the Reservoirs GIIP here
- Create or Upload PVT (SG, Pi, Ti) here
In case you need to calculate the Monthly Measures from the Daily Measures:
- Upload Daily Measures
- Calculate the Monthly Measures using Monthly Measures Calculator
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
