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