2. basic cmg workflow course notes_2010.10

1 | P a g e C o p y r i g h t C o m p u t e r M o d e l l i n g G r o u p , I n c . C o n f i d e n t i a l

Tutorial

Builder & Results

Black Oil- Reservoir Simulation Model

Using 2010 General Release: Builder and Imex

Exercise 1

By Computer Modelling Group Ltd.


Table of Contents

A. REQUIRED FILES 4

B. STARTING CMG LAUNCHER 5

B.1 Introduction 5

B.2 Creating a Project in Launcher 7

C. CREATING A BLACK OIL MODEL USING BUILDER 6

C.1 Opening BUILDER 8

C.2 Selecting data 8

C.3 Explanation of Builder Window 9

C.4 Setting Input/Output Controls 13

C.5 Creating Reservoir Description Data 15

Loading Map and Creating the Simulation Grid 15

Assigning Structure Top, Thickness and Porosity 19

Creating Formula to Derive Perm from Porosity 26

Entering Rock Compressibility 31

C.6 Saving First Time Data-Set 24

C.7 Creating PVT Data 35

C.8 Creating Relative Permeability Data 30

C.9 Creating Initial Conditions 46


C.10 Creating Well and Recurrent Data 47

Loading Well Trajectories and Perforation Data 47

Adding Historical Production Data 51

Averaging Production Data 54

Creating Field History File 56

Well Definitions and Constraints 57

Writing Restart Information 61

D. RUNNING THE MODEL IN IMEX 63

E. ADDING AN AQUIFER FOR HISTORY MATCHING THE RESERVOIR PRESSURE 65

F. REVIEWING THE SIMULATION RESULTS USING RESULTS GRAPH AND RESULTS 3D 67

G. USING THE HISTORY MATCHED MODEL IN A PREDICTION RUN 69

H. USING THE TRIGGER OPTION TO CONTROL THE INJECTION BASED ON SECTOR PRESSURE 78


A. REQUIRED FILES:

1. Depth to TOS Map in AtlasBoundary Format (*.bna file)

2. Gross Thickness Map in AtlasBoundary Format (*.bna file)

3. Porosity Map in AtlasBoundary Format (*.bna file)

4. Data (Excel file)

5. Well Trajectories in CMG Format(*.bna file)

6. Well Perfs in CMG Format (*.perf file)

7. Production-history (*.prd)

8. Production-history (*.fhf)

9. Pressure History (*.fhf)


B. STARTING CMG LAUNCHER

Start CMG Launcher

Double Click on the CMG icon or

Start/Program/CMG/Launcher

B.1. Introduction

Launcher is an application where you can manage files, invoke applications and

manage runs. This window is divided into 3 sections:

1. Top section (TOP SECT) is used to manage files: This is similar to Windows Explorer

2. Middle section (MID SECT) is used to invoke applications:

a. You can add/modify/remove/copy any of your favourite applications (like Excel, Word, WordPad etc) in this space along with CMGs applications

Select View | Program Icons | Add | or Right Click then

Select Add Icon

b. In order to arrange these icons:

TOP SECT

MID SECT

BOT SECT


Select View | Program Tabs | Arrange Icons | Right Click then

Select Arrange Icon in Tabs

c. For changing the program icon size:

Select View | Program Icon Size |

3. Bottom Section (BOT SECT) is where you can manage runs and view the progress/message of each run

Right Click on the white space and

Select View Log File | or View Message


B.2. Creating A Project In Launcher

1. Go to the main Builder Menu

Select Projects | Add

1. Browse, then

Select 1-Basic Workflow Field Unit | directory where you stored the data files

2. Name the project BASIC CMG WORKFLOW MODELS

3. Exit back to CMG Launcher

Click OK

4. You should now have this directory displayed

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C. CREATING A BLACK OIL MODEL USING BUILDER

C.1. Opening Builder

Start CMG Launcher

Double click on the CMG icon

C.2. Selecting Data

1. Select IMEX

2. Select Field

3. Select Single Porosity

4. Select Simulation Starting date:

a. Year: 1991

b. Month: 01

c. Day: 01

5. Click OK

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6. Click OK

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TIPS:

is Warning Message (Default Value is being used which is

not fatal and simulator will

run)

is Error Message (something wrong or missing data)

is Go-ahead Message

Our goal is to get in all the

sections of builder


C.3. Explanation Of Builder Window

Plot Area

Tree view with Objects

for each menu of Pop-Up

Tree view

with Pop-Up

menu bar

similar to Top

Top Panel with

commonly used

icons (explained

below in detail)

Top Menu bar,

similar to Tree

view with Pop-

up Menu bar

To change the

dates

To view change

current viewed

property

To from IJ-

Areal, IK cross-

section, JK

cross-section,

3D mode

To move from

One plane to

another in

IJ,IK,JK view


Top panel icon explanation:

1. To Create a new data-set.

2. To Open a new data-set.

3. To Save the data-set.

4. To Copy an existing image on the plot area as a jpg then paste it into PowerPoint or use Ctrl+C simultaneously

5. To Print an existing image on the plot area.

6. To Rotate your image continuously. It works only in 3D mode.

7. To Slab your reservoir in many sections.

8. To Cut your reservoir in the plot area. It works only in 3D mode.

9. To Quick 3D view. This removes all the details on plot area and brings up cleaner looking 3D image only Recommended only for presentation.

10. To Switch between Stereographic mode to Non-Stereographic mode. This only important if your PC is equipped with Stereographic graphics card for 3D

visualization.

11. To Change the size of viewing area. Recommended to use Full Window for bigger working image.

12. To Access the look and feel of current reservoir image on the plot area or Right Click on Plot area and Click Properties

13. To Switch between adding/removing the Tree-view window. (Can be used when your grid/well -density is high and wells appear like dense Broccoli or when you

are trying to add hydraulic fracture and want to edit multiple grid blocks. This will

enlarge the plot area substantially).

14. To Access Time Line view plot. This is summary plot of various events that occurring in your field (including change in rates, perforations, work-over etc.).

15. To change to Probe Mode.

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16. To Edit Grid, Create LGR, Split Grid Planes, Combine Layer

17. To Edit Property

18. To Edit Perforations or Add wells

19. To Move the object on the screen.

20. To Zoom the reservoir.

21. To Pan the reservoir.

22. To Rotate the reservoir in 3D mode.

23. To add Sectors (It is greyed out in 3D mode)

24. To add Aquifers (It is greyed out in 3D mode)

25. To Add Lease Planes (It is greyed out in 3D mode)

*TIPS*: In 3D mode, if you have active then, you can also Zoom by Holding

simultaneously Control Key + Left Mouse Button and then moving the mouse

*TIPS*: In 3D mode, if you have active then, you can also Pan by Holding

simultaneously Shift Key + Left Mouse Button and then moving the mouse


C.4. Setting Input/Output Controls

1. Go to the Model Tree View

Select I/O Control | Simulation Results Output

2. Click Select tab

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3. This brings up Select variables window(where you can pick any additional variables that you want to output)

4. Click OK (We will default settings for now)

5. Click OK again to return to Main Builder window

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C.5. Creating Reservoir Description Data

Loading map and Creating the Simulation Grid


Select File | Open Map File

2. Select Atlas Boundary format | from the Map Type drop down list

3. Select Units type as ft

4. Select Atlas Boundary file | Browse then clicking the file The (depth to) Top- of-Structure map file called Depth to TOS Map in Atlas Boundary Format.bna

5. Select OK

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6. Select Full Window | under-drop down menu for Increasing the viewing window

7. Maximize the screen for a better view by clicking on the window maximise button (the square in the top right of the windows)

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Select Reservoir | Create Grid | Orthogonal Corner Point | Will explore other grid creation option later

9. Enter the following data:

I direction 25 | the number of grids in the I-direction

J direction 35 | the number of grids in the J-direction

K direction 4 | the number of grids in the K-direction

I direction box 25*360 | specify a constant I-direction gridblock length of 360 ft for all 25 I-direction columns

J direction box 35*410 | specify a constant J-direction gridblock length of 410 ft for all 35 J-direction rows.

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10. Click OK

11. Hold down Shift key and hold down left mouse button to move (pan) grid

12. Hold down Ctrl key and hold down left mouse button to rotate grid

13. Align the grid with the fault so that a grid block boundary lies along it, and the grid covers the whole map area.

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Assigning Structure Top, Thickness and Porosity

1. Select | to change display control to Probe mode

2. Select Specify Property | to open the General Property Specification spreadsheet as shown below Or expanding Tree View of Array Properties and

double click required property - in this case Grid Top.

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3. Select the box at the intersection of the Layer 1 row and the Grid Top column

4. Right click in this box and select the Geological Map option as the data source.

5. Select the Values in file1 button, then Browse for and Select the top-of-structure map file called Depth to TOS Map in Atlas Boundary Format.bna

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6. Select OK to return to the General Property Specification spreadsheet display.

7. Select the cell at the intersection of the Layer 1 row and the Grid Thickness column

8. Right-Click to Select the Geological Map option as the data source type

9. Select the Values in file1 box of Property Specification Window, then Browse for and Select the thickness-of-structure called Gross Thickness Map in

AtlasBoundary Format.bna

10. Enter 0.25 in the times box in order to allocate 25% of the total thickness map to each of the 4 layers in the grid.

11. Copy the Grid Thickness/Layer 1 cell contents and Paste it into the Layer 2, Layer 3 and Layer 4 Grid Thickness column cells to complete the specification of Grid

Thickness source data for each of the 4 layers in the grid. Or Ctrl-C and Ctrl-V

keystrokes to copy specifications for the first layer to the other 3 just as in a regular

spreadsheet.

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12. Select the cell at the intersection of the Layer 1 row and the Porosity column

13. Right-Click to Select the Geological Map option as the data source type

14. Select the Values in file1 button (similarly to step 5), then Browse for and Select the Porosity Map in AtlasBoundary Format.bna.

15. Copy the Porosity/Layer 1 cell contents and Paste it into the Layer 2, Layer 3 and Layer 4 Porosity column cells

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16. Check Grid Thickness, Grid Top, Porosity in Block / Corner Value Calculation

17. Click OK to populate the grid with top-of-structure and grid thickness data. This operation is performed by BUILDER using the specified map data to interpolate

grid cell values

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*TIPS*: Sometimes due to

low density of contour lines

in a map, you might

experience sharp edges that

extend all the way to the

surface. This can be

removed by checking 4th

or

3rd

box, which will assign

some values to each grid-

block.

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TIP

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18. To view 3D, change the display mode from IJ-2D aerial to 3D view in the top left hand drop-down menu to better visualize the grid and property data you have just

finished creating values

19. To rotate the model, select the rotate 3D view button (from the toolbar), then Rotate the display by holding down the left mouse button and moving the mouse.

You can also Enlarge or Shrink the grid by holding down the Ctrl key and left

mouse button while moving the mouse. Finally you can Pan the grid by holding

down the Shift key and left mouse button while moving

*TIPS: At any time if you want to get back to original view size, then Right click in

the plot area and Select Full reservoir View. This will resize your reservoir to

default.

20. To remove the contour map from the display, Right-Click the mouse while the cursor is anywhere on the grid display area, then Select Properties from the

displayed menu (at the bottom of list), then Select Geologic Maps from the tree

view, and (finally) Uncheck the Show Map box

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Creating Formula to Derive Perm from Porosity


Select Tools | Enter a Formula | option to create an equation for calculating permeability from porosity.

2. Change the name of the formula from Scheme 1 to Perm Formula 1

*TIPS: Once the Name is assigned to a Formula, it can never be changed. You can

however edit any formula

3. Select Add to List of Independent Variables, then Select Porosity

4. Click OK.

5. Entering the formula:

a. Enter the partial formula: 5*EXP(20*

b. Highlight Porosity variable X0

c. Select Insert Selected into Formula

d. Enter the right bracket symbol on the calculator ). The formula should look like 5*EXP(20*X0)

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6. Select Specify Property | in the top right hand side of screen

7. Right-Click in the Whole Grid cell under the Permeability I column, then Select Formula.

8. Select Perm Formula 1 | from Available Formula window

9. Click Close

10. Click OK

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5b

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11. Right-Click in the Whole Grid cell under the Permeability J column, then Select EQUALSI Then Click OK

12. Right-Click in the Whole Grid cell under the Permeability K column, then Select EQUALSI

13. Under drop-down menu Select * and then Enter 0.1 in the Value box ratio of vertical to horizontal permeability. Finally Click OK.

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14. Click OK to go back to main area

15. Click OK to populate the grid with Permeability data.

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Enter Rock Compressibility

16. Double Click Rock Compressibility

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*TIPS*: Right click under

the tree view structure and

you can validate the

particular section.

Validation process gives

you useful information on

error/warning messages.


17. Enter the following data

CPOR 2e-6 | Rock compressibility

PRPOR 4000 | Reference pressure

18. Double Click Compaction/Dilation Regions tab (on the treeview)

19. Create a New Region

20. Enter the following data

CPOR 2e-6 | Rock compressibility

PRPOR 4000 | Reference pressure

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21. Click Apply|OK

This completes Reservoir Description Section and you should have got

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C.6. Saving First Time Data Set

1. Select File, and then Click Save

2. Name the file as Basecase.dat

3. You have option to save this file as three text array methods

Default | Right now we will chose Default

Text optimized for size and speed

Text optimized for readability

4. Type any Comments in the white space provided at the bottom which will be appended at the top of the dataset

5. Click OK

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C.7. Creating PVT data

1. Click the Component Tab | MODEL

2. Click the Launch Dialog to Create BLACKOIL Model Using Correlations

3. Click OK | This mode is called Quick Model creation, which uses default set of correlations to generate PVT properties

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4. Fill the table with following values:

a. Reservoir Temperature: 150 F

b. Generate data upto Max. Pressure of: 5100 psi

c. Bubble point pressure calculation (Select Value Provided under drop down menu): 4900 psi

d. Oil Density at STC (Select Stock tank Oil Gravity(API) under drop down menu): 35

e. Gas Density at STC (Select Gas gravity (Air=1) under drop down menu): 0.70

f. Reference Pressure for Water Properties: 4000 psi

g. Pressure Dependence of Water viscosity: 0 cp/psi

h. Water Salinity: 100000 ppm

5. Click OK

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6. To view PVT table

Double Click PVT Region: 1

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7. To add multiple PVT regions

Click | Right now we will stick with single PVT region.

8. To view/select the correlations that have been used in Quick PVT Model creation process

Click | Generate PVT Table Using Correlations | to view/edit the correlation generated for the black-oil PVT data (tabular or plotted). You can

edit the data in the table or by dragging points on the plotted curve.

9. To edit properties that were created in previous step

Select General tab

Click | Generate Water Properties Using Correlations

10. Close the PVT Table window to complete the Components section

C.7. Creating Relative Permeability Data


Click Rock Fluid | Create | Edit Rock Types

2. Select New Rock Type by clicking on the button.

3. Uncheck

Include capillary pressure hysteresis (imbibition curve)

Include capillary pressure (drainage cure if using hysteresis) | since we dont want to model hysteresis effect.

4. Open DATA.xls file | It locates in 1-Basic WorkFlow Field Units folder.

Ctrl-C keystroke to copy Water-oil relative permeability data

Ctrl-V keystroke to paste copied data to Water-Oil Relative Permeability Table

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Table: Water-Oil relative permeability table

from DATA.xls spreadsheet

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Ctrl-C

Ctrl-V

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5. Select Liquid-Gas Table (Liquid Saturation) | under the Relative Permeability Table dropdown menu

6. Uncheck

Include capillary pressure hysteresis (imbibition curve)

Include capillary pressure (drainage cure if using hysteresis)

7. Open DATA.xls file again (similar Step 4)

Ctrl-C keystroke to copy Liquid-Gas relative permeability data from spreadsheet (DATA.xls)

Ctrl-V keystroke to paste copied data Liquid-Gas Relative Permeability Table


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Ctrl-C

Ctrl-V


Relative Permeability Smoothing


Click Rock Fluid |Create | Edit Rock Types ...

9. Select Water-Oil Table | from Relative Permeability Table drop down menu

10. Click | Smooth Table

11. Select Power law for all properties

12. Select Smooth Curves

13. Select OK

14. Click Apply

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15. Click OK

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16. Select Liquid-Gas Table (Liquid Saturation) | from Relative Permeability Table drop down menu

17. Repeat Steps 10-15 | Below are relative permeability curves after smoothening

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18. Information Step (Not part of Tutorial)

You can also Generates the Rock-Fluid relative permeability table using the correlations.

Click | Generate Tables Using Correlation

19. Enter the saturation end points parameters for the Analytical relative permeability curves generation (Not part of Tutorial)

20. The Rock Fluid section should have a green check mark. Save the file at this time.


C.9. Creating Initial Conditions

1. Go to the Model Tree view, Click Initial Conditions and Type the following values in the available fields:

a. Reference Pressure: 4000 psi

b. Reference Depth: 10000 ft

c. Water-Oil Contact: 10100 ft

d. Constant Bubble Point Pressure (PB): 4900 psi

2. Click Apply

3. Click OK

4. At this point it is advisable to save the data by Click File | Save

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1b

1c

1d

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C.10. Creating Well and Recurrent Data

Loading Well Trajectories and Perforation data


Select Well | Well Trajectories | Well Trajectories... | or

Select File | Import from another file | Well Trajectories...

2. Select File Type as Table Format | Trajectory file type

3. Select File Units as ft for x,y and z,MD

4. Browse, then

Select Well Trajectories in CMG Format.wdb file

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5. Click Next

6. Check the box Clear all existing trajectories | You have an option to select or remove any unwanted trajectories to load. We will load all the trajectories

7. Click Next

8. To load the perforation history file

Click Go to Perfs | or

Select Well | Well Trajectories | Trajectory Perforation Intervals...

9. Click Read File | It will help you load the time-dependent perforation history. You can also use Quick perfs for exploration projects where you do not have

perforation data

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10. Open trajectory file

Select Well Perfs in CMG Format.perf file

Select Field (ft) in File unit selection

11. Click Open | If this is done correctly, the window will be like

12. Click Apply | OK. This completes the trajectories and Perforation of the wells in the model.

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Adding Historical Production Data to the Model


Select Well | Import Production | Injection Data

2. Browse, then

Select production-history.prd file

3. Click Next

4. Highlight the first line containing the production data (top window) and well name (lower window)

5. Click Next

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6. Click Next | If the delimiters look good and the columns are separated correctly

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7. Go to Columns 1,3,4,5,6 and in the identifier row

a. Choose Well |Group Name

b. Choose Oil Produced

c. Choose Water Produced

d. Choose Gas Produced

e. Choose MSCF/day

8. Click Next

7a 7b 7c 7d

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9. Click Finish

This is the place showing you which wells production data has been picked up and

which well is not. For example, the program could not find any production data from

well 5, 7 and 9. Since wells 5, 7 and 9 have no production history, the easiest action is

to delete them from the model. We will do this later

10. The Simulation Dates window will appear

Click Close

Averaging Production Data

Next thing we want to do is to generate the well recurrent data for every month.


Select Well | Average Production/Injection Data...

2. Move your mouse on the y-axis

Right click | A menu will show up to allow you to change the average interval from this point on to monthly, bi-annually, yearly, etc

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3. Select Reset all intervals to every month

4. Click OK

5. Click 1992-01-01 (365) check box | Date you want to stop the simulation

6. Click Close

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Creating Field Production History (*.fhf) for History Match

This file (*.fhf) is required if you want to compare the historical fluid data to simulation

fluid data in RESULTS Graph. If you had loaded Pressure data through the Production

loading Wizard, then you will have option to create separate historical pressure data file,

however since we have not loaded pressure data, this option is greyed out currently


Select Well | Create Field History File | then provide a filename (or you can just use the default

2. Click OK

If you had loaded injection or well head/bottom hole pressure data then separate

injection/pressure *.fhf file is created

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Well Definition and Constraints

For those wells that have no production history, we can either delete them or define them

as a producer or injector and shut-in the wells so that they will not affect the history

match


Select Wells & Recurrent

Right Click on Well 5 | Delete

2. Click Yes | Completely delete Well_5

3. Go to Well_7

Right Click on Well 7 | Properties

4. Select INJECTOR MOBWEIGHT | for the type

5. Check Auto-apply | check box

6. Click Apply

7. Click OK

8. Go to the Constraints tab, Check Constraint definition | box

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9. Select OPERATE | under Constraint column

10. Type 3625 psi | under Value column

11. Click Apply | OK

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12. Go to the Option tab | Check Status | under status box

13. Select SHUTIN | under Type/Value column



16. Copy all the above specifications to Well 9. To do that, make sure you are looking at Well 7 in the Name/Date list.

Highlight the following Events (for Well 7) by clicking on them with your mouse and pressing down the Ctrl key to select multiple items: INJECTOR,

constraints, injected fluid, SHUTIN

Right Click around the highlighted section, and select Copy events using filter... This will open a new window. Or Press the Tools button at the bottom of the

screen and select Copy events using filter...

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17. In the Select Wells tab

Check Well_9 and Highlighted

18. In the Select Dates tab

Check 1991-01-01 date and Highlighted

19. Press Search&Add button then OK

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20. If everything was done correctly, your tree view in the Well Events window

should look like

21. Click OK

22. Please save data by Click File | Save

Write Out Restart information to a Restart File


Select I/O Control | Restart

2. Click Enable Restart Writing | box

3. Click on button to add the date for which you want to write restart information

4. Click OK

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5. Click OK.

We now have a dataset that includes instructions to create restart records,

you will be able to use it to make future prediction or forecast runs

without having to recalculate the historical portion of the data

6. Click OK

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D. RUNNING THE IMEX DATASET

If everything is OK, you should be able to run the dataset using IMEX.

1. Locate the file Basecase.dat in your launcher

2. Drag and Drop it onto the IMEX 2010.10 icon and Release the mouse

3. To submit/run a simulation job, you can either

Select Run immediately with mx201010.exe | If there are no errors, a MS-DOS window will open up and show you the progress of the run. When finished, the

MS-DOS window will be terminated and shows a brief summary of results. Or

Select Submit to Scheduler | Local | use this option in the tutorial

4. Click OK

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5. Right Click on the current run and Select View Log File

6. New files created by IMEX during the run include

Basecase.out: an ASCII file containing simulator output in the old printer style format

Basecase.irf: an ASCII file containing pointers to data locations in the Base case.mrf file used by RESULTS Graph, RESULTS 3D and RESULTS Report

for data display and exporting

Basecase.mrf: a binary file containing simulator output.

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Basecase.log: an ASCII file containing information about the run.

Basecase.err: an ASCII file containing errors encountered during the run

E. ADDING AN AQUIFER FOR HISTORY MATCHING THE RESERVOIR PRESSURE

The next thing we want to do is add an aquifer, and try to History Match the Average

Reservoir Pressure

1. Drag and Drop Basecase.dat onto the Builder 2010.10 icon and release the mouse


Select Reservoir | Create/Edit Aquifers... or

Click icon

3. Select The aquifer is to be connected to the bottom of the reservoir | box

4. Select Carter-Tracey (limited extent) for Modelling Method and Leakage is allowed for Leak, leave all other items blank

5. Add the aquifer pressure function tables based on the extent of aquifer size ratio to reservoir size. Let say our aquifer is 3.5 times bigger than our reservoir

Select Table for R-Ratio=3.5

6. Select OK | to exit the panel to return to the model display area

7. Click Apply | OK

8. Go to File | Save As | to save the file name as Basecase_AQ.dat

9. Click OK | to save the file and Exit Builder, Click Yes|OK to confirm save changes

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10. Drag and Drop Basecase_AQ.dat onto the IMEX 2010.10 icon and Release the mouse to run simulation

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F. REVIEWING THE SIMULATION RESULTS USING RESULTS GRAPH AND RESULTS 3D

We can now look at the simulation run and compare it with the historical data and see

how the reservoir would perform, so those 3 cases are:

Basecase.irf | reservoir without aquifer

Basecase_AQ.irf | reservoir with aquifer

Pressure History.fhf | field history

1. Drag and Drop Basecase_AQ.irf onto the Results Graph 2010.10 icon.

2. Go to the main Results Menu

Select File | Open CMG Simulation Results

Select Basecase.irf

We now have both simulation results loaded so that we can compare them


Select File | Open Field History

Select Pressure History.fhf

4. Right Click on Plot 1 or Click on Add Curve icon

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5. In the Results Graph Add Curves

Select Basecase.irf | in the File box

Select Special History | in the Origin Type box

Select Pressure: PRES Average Reservoir Pressure | in the Parameter box

6. Click OK.

7. Repeat the same steps (4 to 6) but this time

Select Basecase_AQ.irf and Pressure History.fhf | in the File box as we want to compare the simulated data with the historical input data. You should now

see a plot similar to:

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8. You can also enter the 3D display area from here (Results 3D) and both types of

display are linked together. When you exit Results 3D or Graph, the .ses (line plot)

or .3tp (3D image) file referred to is a template that you can use to re-create the

images that you have generated using the same or other input files.

9. Results 3D and Graph are very intuitive and most things can be accessed by the

menus or by right mouse clicking on the display areas.

G. USING THE HISTORICAL DATA RESTART FILE IN A PREDICTION RUN

We now completed dataset with the historical match run. We are going to use the Restart

Run feature to make the future prediction runs without having to rerun the historical data

portion

1. Drag and Drop Basecase_AQ.dat onto the Builder 2010.10 icon.


Select File | Save As new name Basecase_Prediction.dat

We want to predict the reservoir performance until 1/1/2000 if the producers are

fixed to a minimum BHP of 2175 psi



Select I/O Control | Restart

Click Restart from previous simulation run (RESTART) | box

4. Browse to select Basecase_AQ.irf

5. Select 1992/01/01 or Last Time Step

6. Click OK



Expand Dates

Double Click on the date 1992-01-01

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8. If set STOP is checked on 1992-01-01, uncheck it

9. Click Add a range of dates button

10. Enter the range of dates

From 1992-01-01

To 2000-01-01

11. Click OK

12. Click OK | to add 96 new dates

13. If set STOP is checked on 1992-01-01 again, Uncheck it and

Check 2000-01-01

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14. Click Close



Expand Wells

Double Click on the Well 1

16. Change the date to 1992-01-01

17. Check the Auto-apply | check box

18. Select Constrain tab | to

Check Constraint definition box

Uncheck Change current primary constraint (ALTER) box

19. Click to parameter STO surface oil rate

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20. Click Delete button

21. Change OPERATE, BHP bottom hole pressure, MIN to 2175 psi

22. Click OK | a new constraint will be created in the date 1991-09-01 for Well 1. The next

task will be to copy the same constraint to all the other wells to do the forecast.

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23. Go to the Model Tree View again


Expand Wells

Double Click on the Well 1

24. Highlight Well 1 constrains

25. Select Tools | Copy events using filter

26. On the Select Wells tab

Select Producers | then Click Select button

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27. On the Select Dates tab Press the Clear List button.

Check on 1992-01-01

Check on Do you want to create new dates | This option creates new date for wells which are already shut in because of production history event

28. Click Clear List button

29. Click Search & Add button

30. Click OK | All the wells except Wells 7 & 9 will have a new constraint starting 1992-01-01

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31. Click OK | to return main menu

32. Save file now. Now All check marks must be green

33. We can now exit Builder and drag and drop the Basecase_Prediction.dat file onto the IMEX 2010.10 icon to run it

We can now look at the simulation run and compare it with the historical data and see

how the reservoir would continue to perform, so those 2 cases are:

Basecase_Prediction.irf | reservoir with aquifer

Production-history.fhf | field history

34. Drag and Drop Basecase_Prediction.irf onto the Results Graph 2010.10 icon.


Select File | Open Field History...

Select Production-history.irf

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36. Right Click on Plot 1 or Click on Add Curve icon

37. In the Results Graph Add Curves

Select basecase_prediction.irf | in the File box

Select Well | in the Origin Type box

Select Oil Rate SC | in the Parameter box

Select Well_1 | in the Origin box

38. Click OK

39. Repeat the same steps (36 to 38) but this time

Select Production-history.fhf | in the File box. You should now see a plot similar to:

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40. To obtain the same plot for all the producers, pressing the Repeat Plots button.

41. Right Click on Plot 1 and select Add Plot. Repeat to obtain the Water Cut plot


H. USING THE TRIGGER OPTION TO CONTROL THE INJECTION BASED ON SECTOR PRESSURE

We are going to use the Trigger feature to start the Injector wells (Well 7 and Well 9)

when the average reservoir pressure drops below 2300 psi.

1. Drag and Drop Basecase_Prediction.irf onto the Builder 2010.10 icon.


Select File | Save As new name Basecase_Trigger.dat

We want to predict the reservoir performance until 1/1/2000 if the producers are fixed to a

minimum BHP of 2175 psi. But here we got limitation on our compressor which cant lift

the oil if the average reservoir pressure falls below 2300 psi. Therefore we are going to

start injector well to support the pressure when pressure falls below 2300 psi.



Double Click on the Trigger

4. In the Well Management Trigger

Select 1992-01-01 | in the Date box

Type Pressure Control | in the Trigger Name box

Select Sector | under Apply On dropdown menu

Select PAVE: Pore volumn Weighted Pressure | under When dropdown menu

Define trigger value less than < 2300 psi

Type OPEN Well_7 Well_9 | inside action box

5. Click Apply

6. Click OK

7. Save and Exit Builder and run Basecase_Trigger.dat


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2. basic cmg workflow course notes_2010.10

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