CMG tutorial

7/23/2019 CMG tutorial

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Institute of Petroleum Engineering

University of Tehran

CMG 2006.10 Tutorial

Building, Running and Analyzing a

Black Oil Reservoir Simulation Model

Using

Builder2006.10

IMEX2006.10

&


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Tutorial IMEX BUILDER 2006.10 1

Creating a Black Oil Model using Builder 2005.15

Create a working directory somewhere on your disk.

Starting CMG Launcher

1. Start the CMG Launcher by using the icon on your desktop, or by going through the Start menu andselecting Programs/CMG/Launcher.

2. Select menu item Projects, then Add Project.

3. Browse for the directory you created.

4. Call the project Tutorial.

5. Click OK to exit back to the Launcher.

6. You should now have this directory displayed.

Opening BUILDER 2006.10

1. Open Builder 2006.10 by double clicking on the appropriate icon in the Launcher.

2. Choose:

IMEX Simulator, Field Units, Single Porosity

Starting date 2010-01-01

3. Click OK twice.

Creating the Simulation Grid (structural data)

1. Maximize the screens for a better view by clicking on the window maximize button.

2. Click Reservoir (on the menu bar) and Create Grid.

3. Select Cartesian and specify a 21 (I-direction) x 21 (J-direction) x 11 (K-direction) grid.

4. Enter21*60 in theI-direction box (meaning all 21 columns in the I-direction will be 60 feet in length).

5. Enter21*60 in the J-direction box (meaning all 21 rows in the J-direction will be 60 feet in length).

6. Click OK.


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The model in the main window should look like this:

7. Change display control to Probe mode by clicking on this toolbar button on left hand side.

8. Click on the Specify Property button (top middle of screen) to open the General Property Specification

spreadsheet.

9. Select the box forlayer 1 under the property column labeled Grid Top and type 4000 (meaning the top of

the reservoir is in the depth of 4000 feet).

10. Select the box forWhole Grid under the property column labeled Grid Thickness and type 20 (meaning all

11 rows in the Z-direction will be 20 feet in height).


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11. Click OK to leave the General Property Specification section. The Calculate Property option will automatically

appear. So, press OK to populate the grid with top-of-structure, grid thickness and porosity data. Press OK to

any messages that appear.

12. Change the view from IJ-2D Areal to 3D View (in the upper left corner!!).

13. Click on the Rotate (3D View) button (from the toolbar) to rotate the display by holding down the left mouse

button and using the cursor to move the model. Hold down the Ctrl key with the left mouse button and move

the mouse toward the bottom of the screento zoom in ormove the mouse to the top of the screen to zoom out.


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Assigning Porosity & Permeability to the Model

14. Select the box forWhole Grid under the property column labeled Porosity and type 0.3.

15. Select Permeability I from the list on the panel and enter the following:

Layer 1 5

Layer 2 100

Layer 3 20

Layer 4 20

Layer 5 20

Layer 6 100

Layer 7 20

Layer 8 20

Layer 9 100

Layer 10 20

Layer 11 20

16. Select Permeability J and right click in the Whole Grid box. Select EQUALSI then OK.

17. Do the same with Permeability K and select EQUALSI. In the first box select * and then enter a value of

0.01 in the second field (this applies a Kv/Kh ratio of 0.01). Press the OK button.


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18. Press OK to leave the General Property Specification section, and OK to calculate the newly specified

properties (as the option for calculating these properties will automatically appear).

19. Double click on Rock Compressibility in the tree view menu and input 1E-6 in the rock compressibility

box. Units will be applied automatically; you should now have the Green check mark for Reservoir section.

20. This would be a good point to save the data set you are working on. Click File then SaveAs. Save file as

Tutorial.dat.

Creating PVT Data

1. Click the Components tab in the tree view.Click the Quick Fluid Model keyword.

2. Check on Launch dialog to create a quick BLACKOIL model using correlations thenpress the OK.

3. Enter 130 (deg F implied) in the Reservoir Temperature box. Generate Pressure data up to 5000 psi. For

Bubble Point Pressure, select the Value provided option and enter a value of2500 psi. For the Oil Density

option, select Stock tank oil gravity (API) as the type of gravity value you want to use and enter a value of 35


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in data entry window. Change the Gas Density boxto display Gas Gravity (Air=1) and type 0.65 in the data

entry window.

4. In the Reference Pressure for Water properties box, enter a value of3000 psi and leave the rest of the

options at their default values and Click OK.

5. Double click on PVT Region: 1 in the tree view and select the PVT Table tab to view the BLACKOIL PVT

data. For this example, the data shown in this table was generated using the information entered in the

Quick black oil model window. However, it is also possible to directly enter or edit values in the PVT

Table. These values can also be updated by using your mouse to select points on the plots associated with

the PVT Region, and dragging the points to the desired location. Please note that the IMEX PVT Regions

window has to be open while using your mouse to change the points on the plot.

6. Close the PVT Table window.


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7. The Component section should have a green check mark now.

Creating Relative Permeability Data

1. Click the Rock-Fluid tab in the tree view.

2. Double clickon Rock Fluid Types in the tree view. A window will open. Click on the button and

select New Rock Type.

3. Press the Tools button (on the Relative Permeability Tables tab) and select Generate Tables using

Correlations.

Enter the following parameters for the analytical relative permeability curves generation.SWCON 0.2

SWCRIT 0.2SOIRW 0.4

SORW 0.4

SOIRG 0.2

SORG 0.2

SGCON 0.05

SGCRIT 0.05

KROCW 0.8

KRWIRO 0.3

KRGCL 0.3

KROGCG 0.8

All Exponents 2.0

4. Press Apply and then OK. Press OK again to get out of the Rock Types window. A graph containing the

relative permeability curves will appear.


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

Creating Initial Conditions

1. Click the Initial Conditions tab on the tree view ofBuilder.

2. Double click on Initial Conditions.

3. Select Water, Oil as the initial fluid in the reservoir to perform a Gravity-Capillary Equilibrium Calculation.

4. Type the following values in the available fields:

3010 (psi implied) in the Reference Pressure window

4010 (ft implied) in the Reference Depth window

4500 (m implied)in the Water-Oil Contact window

5. Check on Constant Bubble Point Pressure (PB) and enter2500 psi.

6. Leave the other boxes blank.

7. Click on Apply; then OK.

8. You should now be back in the main Builder window with all tabs showing a green checkmark in the tree

view, except for the Wells & Recurrent tab.

9. At this point it is advisable to save the data again by selecting File from the top menu and Save.

Adding Production/Injection Wells to the Model

Once we have created the static model, we will now add production and injection wells to the model.

1. Click on the Wells & Recurrent tab and choose Well New.

2. In the pop-up window type a name for the well.


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3. Click on Constraints in the tabs on the left.

4. Check on constraint definition and select OPERATE under the property column labeled constraint.

Select STO surface oil rate under the property column labeled Parameterand MAX under the property

column labeled limit/Mode. Enter750 bbl/day as the value and click OK.

5. Expand Wells (1) and Prod-1 and double click on 2010-01-01 PERF on the tree view.


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6. Click on the Perforations tab on the pop-up window.

7. Click on the Begin button.

8. Select Plane 11 of 11 from the View Control Bar in the main window.

9. Click on the top right block (21,1,11) so that the Well Completion Data looks like below:

10. Click on Stop and then OK.

11. Well-1 is added to the model in the main window:

12. Now go back to main Builder window and double click on Dates (1) on the tree view.

13. In the pop-up window, click on Add a range of dates: button on the right.

14. Enter date from 2010-1-1 to 2021-1-1 by clicking on the button next to each item.

15. Select 1 Month as time step and click on OK twice.

16. Close the Simulation Dates window.


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Now all tabs in the main Builder window should have a green checkmark in the tree view. This means the

model is ready.

Running the IMEX Dataset

1. Go to the main Builder menu and select Tools / Validate with Simulator. Click on Yes to save the file

before running. The following window will pop up:

2. Check on Run normal immediately and click on the Run / Submit button.3. If there are no errors, the window will show you the progress of the run. When finished, a brief summary of

results will be displayed

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.

1. Drag and drop Tutorial.irfonto the Results 3D 2006.10 icon.

2. Select 3D View and Oil Saturation as the property to show.

3. Click on the button to show saturation change vs. time.

4. Close the window.

5. Drag and drop Tutorial.irfonto the Results 3D 2006.10 icon.

6. Click on the Add Curve icon .

7. Select the file to display data from as Tutorial.irf. Select curve parameter Cumulative Oil Rate SC.

Choose Well-1 for the Origin and then click OK.


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8. Click on the button.

9. In the tree view, right click on Plot 2 and select Add Property Vs. Distance.

10. Select Linear Path from UBA 21 1 11 to UBA 1 21 11.11. Select Oil Saturation forproperty and 2021-01-01 forTime.

12. Click on Add Curve button and then OK.

Tasks

1. Plot average reservoir pressure vs. time.

2. Plot saturation change vs. time for a block 21 1 11.

3. Define Well-1 in layers 9 instead of layer 11 and compare cumulative oil produced with previous model.

4. Define a water injection well in the opposite corner of the model with a rate of 500 STB/day and compare

cumulative oil produced and average reservoir pressure.

5. Raise the injection rate to 2000 STB/day and repeat previous step for the results.

Documents

CMG tutorial