Download - L12 PVTi Basics
-
A Step by Step Guide to UsePVTi
(Geoquest)
-
1. Press the Geoquest launcher on your PC and the following screen will appear2. Press PVTi to obtain the following screen3. Select a working directory and press Run
-
Create a project in your pvtclass directory.Here it is called test1Once you open that *.pvti project you will work with the following screen 123
-
Once you opened a project you can seethe different options in the main PVTipanel
-
Library of Components
-
Lets discuss these options in class ...
-
Now lets define each one of these tool bars
-
You need to have an excelfile with this informationImporting data ...123
-
You can characterize the component in the mixture using various correlations
-
Characterization of the C7+ fractionAnd these options for the acentric factor
-
Alternatively, you can define the EOS parameters yourself. But, be careful! - Recall class tips.
-
Next we must define the composition of the mixtureagain import from an excel file(shaded area)
-
And here is the result.
Notice that the excel clipboard must havetwo columns. One withthe names and one withthe mole fractions
-
Useful Plots within SYSTEM Module Phase Envelope Finger Print
-
Now you finished with the SYSTEM moduleThis was used to define:-EOS-Fluid Mixture Components & Compositions
You must now enter information in the SIMULATE module
-
Now lets use the Simulate module from the PVTi main panelFirst we must define the type of experimentslater we can input the experimental observations
-
This is the list of available experiments Here we selected a CCENotice the default units!We should change them
-
123Change units globally usingUtilities
-
Once we have the proper units, lets go back to the Experimental conditions. Paste shaded data from excel file. Only the pressureswill be pasted here
-
To input the experimental observations use the same clipboard as for the experiments. Only the relative volumes (RV) will be pasted
-
Now perform the simulation requestedNote the differencesbetween simulatedandexperimental results
-
If you want to give different weights to the experimental datapress G and the following screen will pop
-
Once the simulation is performed you can view theresults in a plot
-
Next calibrate the EOS parameters to match the CCE data.
-
Here we are tuning the BICsNote the grouping. Set #1 contains k C1-NC4 to k C1-C7+.
-
It is wise to set upper and lower bounds to the regression variables.Usually + 10% from defaultvalues.
These were the default limits (Dangerous!!!!)
-
Regression Results ScreenIntermediate iteration results with RSS.Initial and final values of the regression variables with % difference.Experimental and predicted results with % error.
-
Regression Results Screen
-
Final RegressionResults
Note the change inEOS parameters
-
Regressed Experimental Results
-
Regressed (blue line)Original Predictions (green line)Data (red squares)
-
Now you may accept orreject the regressionparameters (calibrated EOS)And you are ready to export the data in a suitable form for Eclipse ***
-
Before accepting orrejecting the regressionparameters (calibrated EOS)
Recall best practices rules!- Check boundaries in parameters Evaluate PVT properties at wider P & T ranges and make sure results are consistent
-
Save *pvi file for further use
-
Other PVTi TestsCVD Depletion - Material Balance
-
1. Press the Geoquest launcher on your PC and the following screen will appear2. Press PVTi to obtain the following screen3. Select a working directory and press Run
-
Define Mixture (condensate)
-
Define Feed Compositions
-
Quality tests
-
Check Condensate or Volatil?
-
Additional Features (Pete 616)Gravitational gradientsMaterial Balance & Recombination testsSwellingHydrocarbon Characterization ProceduresGas Cycling Condensate and Volatile ReservoirsProduction Strategies (rates,completions, BHP constraints)Separator and gas Injection Optimization