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EX 2.2Sensitivity Modelling
This is based on the data used in Example 1, with
sensitivities set up to model well performance as water-cut
increases and reservoir pressure declines.
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EX 2.3Sensitivity Modelling
Select File - Openand load EXAMPL2.WFL
Select Analysis - Operat ing Po int - Sensi t iv i ty
Review Sensitivity Values selected Water Cut Values = 17%, 40% and 70%
Reservoir Pressures = 3800 psia, 3500 psia & 3000psia
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EX 2.4Sensitivity Modelling
Review other sensitivity groups
sensitivities available depend on the data input to the model
Calculateto perform the Sensitivity Analysis.
10 rates x 3 x 3 = 90 calculations. Max = 21 rates x10x10 = 2100
Plot as Inf low/Outf low
Layer pressu re= All values Water Cut= All Values
Note that one sensitivity set is labelled no operating
point. Identify which sensitivity values the condition corresponds
to and plot it individually as an Inf low - Outf lowplot.
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EX 2.5Sensitivity Modelling
Note generally that any one sensitivity value can be plottedagainst any other.
On the Plot Opt ion sdialog box select Performance
Analysis. You can plot Operat ing RateorPressureagainstone sensitivity with the other sensitivity as the curve family.
Plot operat ing rateagainst water cu tfor all three layerpressures.
Note that on the Plot Opt ion sscreen almost any
combination can be used to set up the desired presentationin the Performance Analysis. Try other combinations.
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EX 2.6Sensitivity Modelling
Investigate the minimum layer pressure for stableproduction at 40% water cut.
What would this well produce at a layer pressure of 3800psia with a zero water cut?
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EX 2.7Plots Vs Depth
Standard plots show pressure and temperature Vs depth.
Rerun your operating point analysis with Iterate to exactswitched on, and inspect the pressure-depth plots.
Select Con f ig - Select Plot Axesto display other variablesVs. depth.
Limited to two parameters on any run
Must be defined before calculating
Try Pressure gradients, Flow regimes, in si tu l iquid
ho ldup , etc. For more variables and more flexibility, use
ANALYSIS.LOG file (discussed later). Next
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EX 2.8Plots Vs Depth
Try with new axes as Erosional velocity and in-situ liquidvelocity or mixture velocity.
Determine what problem can the completion has and atwhat depth.
Make a sensitivity to the diameter of the tubing withpossible problems to check if its recommendablechange the diameter at this depth.
Make a sensitivity to P layer and check if this can solve theproblem at future.
Solids can increase the problem.
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EX 2.9Plots Vs Depth
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EX 2.10Plots Vs Depth
Try changing plot axes to superficial gas velocity andTurner critical velocity.
Check running operating point, plot pressure/depth anddetermine flow stability. (one of the stability criteria).
Try again changing axes to in situ liquid hold up andmixture density for instance.
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EX 2.11
Reviewing previousanalyses
Return to the graphical interface and select View Resu ltsfrom the Analysismenu.
Select Ex2v36c.CLC and Open
Then Plotto review the results of a more detailed analysis.
Ex2bv36c.CLC is an even more detailed analysis
After opening a .CLC file, it is possible to create a reportfor this data.
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EX 2.12Reporting
Subjects covered:
Export to Tab-separated files - WELLFLO.RPT
Reporting in Write/WordPad. Copying graphs to Word Processors.
Data in Analysis. log.
Data in WellFlo. log.
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EX 2.13Reporting in Write
Load EXAMPL2.WFL and View Results - OpenEx2v36c.CLC
UnderCon f igu re - Preferencesselect Tabbed Text Format
Go to Analysis/View Resu lts - Repo rt
Scan through the file and review.
Go back to Con f igu re - Preferences andselect RTF (defaul t)
Go to Analysis/View Resu lts - Repo rtagain and check the
improved report formatting in WordPad.
You can call up your own report browser (see manual).
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EX 2.14Reporting
The Macro fo rmatoption underConf ig ure Preferencesinserts markers into the report that can be used by a macroto prepare the desired format (tabbing, pagination, boldheadings, etc). You might need this if your favourite word
processor cannot handle rich text format (RTF). Each section is numbered and labelled with three asterisks
on the following line. These can be used to find theappropriate section and enter page breaks, select textformat and change styles.
This has been superseded by the RTFoption, which shouldbe compatible with most word processors.
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EX 2.15
Reporting -Pasting Plots
Bring a report up on screen (open WELLFLO.RPT). Go backto WellFlo without closing down Wordpad (Notepad) *
Plot Performance Analysis. If desired, the plot can beprinted directly from here (File - Prin t), or pasted in the
report.
Alt+PrintScreenallows you to copy the graph to theClipBoard. From here, it can be pasted directly into thereport, or into a graphics program (such as PaintShop Pro,PaintBrush)* for editing, and then copied into the report.
Once the graph is ready, insert it into the report using Edit -Paste (or Ctrl+V)
* Alt+Tabis a useful shortcut to jump betweenapplications
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EX 2.16Reporting
Close WELLFLO.RPT in WordPad (or NotePad)
Go to Program Manager and load Excel or otherspreadsheet package.
Open WELLFLO.RPT in spreadsheet (text file). Note that theTabbed Format is Excel compatible, but the rtf is not.
Review File.
Try graphing some of the data.
Pressure depth plots etc.
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EX 2.17Detailed Reporting
Return to WellFlo.
Select Conf ig ure - Preferences.
Switch on the options to output ANALYSIS.LOG and
WELLFLO.LOG Normally switched off as these files are written as the program runs
and slow down execution.
WELLFLO.LOG includes similar information toWELLFLO.RPT but is not formatted and has a time stamp.
Useful for identifying problems. ANALYSIS.LOG provides a detailed listing of: phase
densities, viscosities, flow regimes, hold ups, erosionalvelocity, unloading velocity, etc. Open this file in Excel andinspect.
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EX 2.18Export To Simulator
Load EXAMPL2.WFL again and select Analysis - Export toSimulato r - VFP File For Ec l ips e - Sing le Well
Select File - DOS Form at(note UNIX option)
Select Units - Oil f ield- note that this module uses unitsystems consistent with the reservoir simulators for whichthe file will be built.
Select Flowrates:
From 1000 to 10000 with 9 steps
Select Gas Ratios: Leave one value at 0.4 - note units
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EX 2.19Export to Simulator
Select Water Cut:
Set the first three values to 0.17, 0.2 and 0.4 (decimal units)
Select Pressures:
Set three values to 100 psia, 150 psia and 200 psia at tubinghead
Select Create Fileand export to EXAMPL2.VFP.
Switch to NotePad and load the file just created.
Note that the file contains the keywords and is correctly laidout to be pasted directly into the control file for the
Reservoir Simulator.
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EX 2.21Summary
Sensitivity modelling and reporting have been examined fora naturally flowing well.
The various graphing and output options including
exporting data to reservoir simulators was reviewed. These features are fundamentals of WellFlo and can be
applied to oil, gas, condensate, ESP and gas-lifted wells fora wide range of applications.