1. Construccion de Un Modelo de Pozo - Corregido

8/14/2019 1. Construccion de Un Modelo de Pozo - Corregido

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Example 1

FloSystem User Course

Well Model Building and Calibration

Naturally Flowing Oil Well


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Overview

Data Entry

Well Deviation Data

Well Completion Data Reservoir Fluid Data

Reservoir Rock Data

Measured Data

Data Matching

Inflow / Outflow curves

Pressure-Depth profiles


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Well Details Mid-perf depth - 8500 ft MD

4.5 OD, 4 ID, 11.6 ppf tubing to 3460 ft MD

3.5 OD, 3 ID, 9.2 ppf tubing to 5000 ft MD

2.875 OD, 2.441 ID, 6.4 ppf tubing to 7000 ft MD

7 OD, 6.3 ID, 23 ppf casing to 8500 ft MD

Oil 38 API Water Gravity: 1.1 Gas Gravity: 0.82 GOR : 400 scf/stb

Water-cut: 17% Res. Press.: 3800 psia

Pb : 1850 psia Res. Temp.: 187 oF

PI: 3.6 stb/day/psi Bo : 1.2 rb/stb


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Dataprep General

Select File - NewSelect DataPrep - General

Report Labelling


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Datum Double-click on Xmas Tree

Enter Datum details


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Rotary Kelly Bushing

Wellhead Elevation

Mean Sea Level

Sea Bed

Datum


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Deviation Data

Select Dataprep - Deviation Data - Well Data

Insert three lines, enter MD, TVD pairs - edit lastrow to 8500, 7500


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Well Components

Select Dataprep - Equipment Data - Well Data

Enter data (node depth is BOTTOM of component)


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Well Components

Select Config - PreferencesView Component name only

Try changing view from text to icons using View- Display as Text or Display as icons

In Config-Preferences, view MD, componentdata, etc.


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Completion Editing Go Back to Deviation Data

Highlight 7000 - Insert Row Enter MD 6000 and TVD 5200

Note that a new node has been inserted in Tubing

3 Double-click on the lower section of Tubing 3

Re-label as Tubing 3b. Call the upper partTubing 3a.

Select Configure - Preferences and include all theoptions in the text display


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PVT Data EntrySelect Dataprep - Reservoir Control - Fluid Parameters

EnterOil Gravity 38 APIGas Gravity 0.82Water Gravity 1.1GOR 400 scf/STBWater Cut 17 %

Select Check: Pressure 3800 psi, Temp 187 oF

Note Glasos correlation resultsPb =1715 psi, Bo = 1.20129


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PVT Data Matching

Select Match, change temp to 187 oF, enter1850 psi beside temp and Calculate

Note Pb = 1715 psi. Press Best Fit

Note new Pb = 1850 PSI Select Form. Vol. Factor as Match Property

Change pressure to 3800 psi

Enter 1.20 as Bo beside 187o

F, 3800 psi field Calculate - Best Fitto tune Bo

Glasos correlation is now tuned for use

throughout the well model


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IPR Data Entry

Select Manual Entry model and Edit Layer Enter layer pressure = 3800 psi, temp = 187

oF and PI = 3.6 STB/day / psi

Select Choose IPR and Vogel, then Plot Minimise graphing window

Select Norm. Pseudo Pressure and Plot

Select Straight Line and Plot Note that all three IPRs are plotted on the

same graph


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IPR Data Entry(contd.)

Maximise graphing window

Double Click on Y axis, note that the Round option isselected

Note the other options

Click Edit , observe options of changing axes, titles,activate the coordinates and add a description of thegraph.

You can save the graph configuration as a template

(File - Save Template) and also print it. (File - Print) Close the graphing window and select Vogel model for

use in the rest of the exercise

Select OK until returned to the icon display


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Measured Data

Use Notepad to view the file EX1.RVP (ASCII File)

This file contains one line - 5900 2200 - the firstnumber is observed surface flowrate in STB and thesecond is well flowing pressure at that rate - this is themeasured data to which we will match the model

Return to WellFlo

Select File - Load Measured Data -Flowrate versus Pressure

Load EX1.RVP - note one pair of values reported asread , it is possible to load multiple pairs.

Display on the Choose IPR plot.


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Well Model Tuning

Select Analysis - Operating point Select Edit Rates Select Rate in lower left of screen / 1000 / 10,000 and

9 steps, select Fill and OK

Tatm. = 60oF Pwh = 200 psia (Top node Xmas Tree) Check Sensitivity Off (both)

Set Correlation to Duns and Ros (std)

Select Calculate and on completion of calculationResults and Plot .

Selecting Measured Data on then Plot to see theInflow /Outflowplot


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Well Model Tuning

Note that the model represents a reasonablematch to observed data.

On Nodal Analysis screen select Sensitivities

Select Flow Correlation as sensitivity 1 and edit (1) Duns and Ros (std); (2) Beggs and Brill (std) (3) Hagedorn and Brown (std); (4) Orkizewski

Return to Nodal Analysis. Switch Sensitivity 1 on

and Calculate. On completion, select Results and Plot and All

Values for sensitivity 1 and Plot again

The four outflow curves are plotted with the IPR


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Well Model Tuning

Zoom on the region of the plot where theintersections and observed data are.

Switching on Iterate To Exact Operating Pointwillgive a more accurate operating point. This option

should always be used. Note that Hagedorn & Brown (std) comes closest to

the observed data.

To get a better match, tune the correlation to themeasured data using the L- factor as a sensitivity.

L modifies the computed pressure gradients. Anacceptable range for L is 0.9 to 1.1.


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Well Model Tuning

How should the productivity index be changed to

obtain a match on the inflow curve? What other reservoir parameter could be the cause

of the slight mismatch?

What else could be at fault?


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Well Model Tuning Return to the Fluid Parameters section and re-tune

the formation volume factor to 1.3

Repeat the calculation with the same sensitivityvalues and note that the observed data now plotscloser to the Duns and Ros correlation outflow curve.

Return the Bo tuning to 1.2 and select the Hagedornand Brown (std) correlation.

Switch off sensitivity and calculate and plot theinflow/outflow curve.

Note the well flowrate reported on the graph Return to graphical editor.


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Well Model Tuning Pressure vs Depth

Select File - Load Measured Data - Depth (MD) vs.Pressure (and Temp), & load EX1.DVP Select Analysis and Pressure Drop and enter the

operating rate you just obtained

start node is Xmas Tree at 200 psia solution node (end node) is Casing (mid-perfs)

Calculate and plot results as Pressure vs. MeasuredDepth, including measured data

Try Operating Pointcalculation mode with Iterate toexactswitched on. This will automatically provideyou with a pressure-depth plot at the appropriateoperating rate.


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Data MatchingPressure vs.Depth

Return to Pressure-Drop Calculation, switch onsensitivity 1 (flow correlations) and Calculate. Now plot pressure versus depth with All values set

in the sensitivity option.

The Hagedorn and Brown (std) correlation givesthe best match to the whole flowing gradientsurvey.

Switch off Sensitivity 1. Reverse the Pressure-Drop

calculation with start node as casing (whatpressure?), and solution node as Xmas tree. Compare the computed and measured data,

especially the THP.


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1. Construccion de Un Modelo de Pozo - Corregido

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