CMG Tutorial
Building, Running and Analyzing a
“Black Oil” Reservoir Simulation Model
Using
Builder 2009.10
&
IMEX 2009.10
PTRL 5012
By: Fatemeh Kamali Yildiray Cinar
March 2013
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Computer Modeling Group Ltd. - CMG Builder: Builder is a MS-Windows based software tool that you can use to create simulation input files (datasets) for CMG simulators. All three CMG simulators, IMEX, GEM and STARS, are supported by Builder. Builder covers all areas of data input, including creating and importing grids and grid properties, locating wells, importing well production data, importing or creating fluid models, rock-fluid properties, and initial conditions. Builder contains a number of tools for data manipulation, creating tables from correlations, and data checking. It allows you to visualize and check your data before running a simulation Creating a “Black Oil” Model using Builder 2009.10 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 and selecting Programs/CMG/Launcher. 2. Select menu item Projects, then Add Project. 3. Browse for the directory where you want to store your files. (Ensure that the disk you have chosen is writable) 4. Call the project Tutorial. 5. Click OK to exit back to the Launcher. 6. You should now have this directory displayed. Opening BUILDER 2009.10 1. Open Builder 2009.10 by double clicking on the appropriate icon in the Launcher. 2. Builder will start, and the Reservoir Simulator Settings dialog will appear. Under Simulator, there are three models; GEM, IMEX and STARS.
IMEX is a three phase black-oil simulator.
GEM is a compositional simulator, used for the most of the EOR projects e.g. CO2 injection, WAG injection, CO2 sequestration with EGR, and CO2 Sequestration with ECBMR
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Main difference between GEM and IMEX is in Component Property Section
STARS is a Thermal simulator, used for thermal recovery and foam flooding projects i.e. steam-assisted gravity drainage, steam drive flooding, in-situ combustion and foam flooding.
Main difference between IMEX and STARS is in Reservoir Description Section, Well and Recurrent Data and Component Property Section.
3. Choose:
IMEX Simulator, SI Units, Single Porosity
Starting date 2013-03-28
4. Click OK.
Builder Manual: In this example, we will use IMEX model. 1. Click “Reservoir” (on the menu bar) and “Create Grid”. 2. Select Cartesian and specify a 10 (I-direction) x 1 (J-direction) x 1 (K-direction) grid
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3. Enter 10*100 in the I-direction box (meaning all 10 columns in the I-direction will be 100 meter in length). 4. Enter 1*100 in the J-direction box (meaning all 1 rows in the J-direction will be 100 meter in length). 5. Click ok
6. Change display control to Probe mode by clicking on toolbar button on left hand side. Now we will specify our model properties. 7. Click on the Specify Property button (top middle of screen) to open the General Property Specification spreadsheet as shown below. Or double click on the Array Properties under the Reservoir tab.
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8. Select the box for the layer under the property column labeled Grid Top. Enter 3000 ft for grid top for layer 1 and 10 for grid thickness. (Also if you Right click in this box, you will be able to select the Geological Map option as the data source). Please see above table. 9. Click Ok/OK 10. Change the view from IJ-2D Areal to 3D View (in the upper left corner). 11. 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 screen to zoom in or move the mouse to the top of the screen to zoom out. 12. Again click on specify property. Assigning Porosity – Ф=0.2 (put data in the Whole Grid row) 13. Assigning Permeability- Select Permeability I =100 md 14. Select Permeability J and right click in the Whole Grid box. Select EQUALSI then OK. 15. Do the same with Permeability K and select * and enter 0.3 in box. Press the OK button. 16. Enter 0.8 for oil saturation and 0.2 for water saturation 17. Press OK to leave the General Property Specification section and then press OK to calculate the Properties 18. Double click on Rock Compressibility in the tree view menu and input 6E-7 in the rock compressibility box, Units will be applied automatically; you should now have the Green check mark for Reservoir section. 19. This would be a good point to save the data set you are working on. Click File then Save As. Save file as CMGTutorial.dat.
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Creating PVT Data: 1. Click the Components tab in the tree view. Then click the MODEL keyword 2. Select Launch dialog to create a quick BLACKOIL model using correlations then press the OK button
3. Enter 70 oC in the Reservoir Temperature box. Generate Pressure data up to 35000 kPa. For Bubble Point Pressure, select the “Generate from GOR values” option and enter a value of 11 m3/m3. 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 in data entry window. Change the Gas Density box to display Gas Gravity (Air=1) and type 0.65 in the data entry window. 4. 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; using your mouse to select points on the plots associated with the PVT Region, and dragging the points to
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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. 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. Click on Create/Edit Rock Types in the tree view. A window will open. Click on the button and select New Rock Type 3. Under Relative Permeability Tables tab, select Water-Oil Table and remove the tick of box assigned for Include capillary pressure hysteresis (imbibition curve) 4. Enter the relative permeability data and OK. Or 5. Use Tools icon and Generate Tables Using Correlations…
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6. Enter the following parameters for the analytical relative permeability curves generation. SWCON
0.2
SWCRIT
0.2
SOIRW
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
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7. 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. 8. The Rock-Fluid section should have a Green check mark now. Creating Initial Conditions 1. Click the Initial-condition tab in the tree view 2. Select water-oil as the fluids in the system 3. Enter the Reference depth and Pressure ( P=35000 kp at 3000 meter) 4. Enter the water-oil contact (3250 meter)
Wells Definition: 1. Click the Well & Recurrent tab on the tree view of Builder 2. Double click on Wells 3. Select ID & Type on the left side of window; enter name and well type as table below. 4. Click the Constraints tab on the left, and check box of constraints definition, and enter constraints from table below.
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Table1- Well Characterization Well Name
Type Injector-
ING
Unweight
PROD
Producer
Perforation 111
10 1 1
Constraint
Parameters
Value
Operate
STW
2500 m3/day
Operate
BHP
35000 kpa
Operate
STO
2500 m3/day
Operate
BHP
1000 kpa
Monitor
WCUT
0.95
5. Click + on the tree view of Builder, double click on the well PERF, and select Perforations tab on the top, click on button, enter well location address in User Block address, for example 1 1 1. 6. Or we can select the Perforations tab and press the
button. This
will allow you to use your mouse to select the grid blocks where you want the well completions to be. Press
when you are done. Press Apply
and then OK. 7. Alternatively, we can simply add to the existing completion, or change it, by going to the Perforations tab and Delete the existing completion with the [X] button and Add new completions with the mouse. 8. You can assign simulation period by opening dates under Wells & Recurrent. Select dates to be 5 years from 2013-03-28 to 2018-03-28. Select 1 Day to be the one step mode. 9. If everything is OK, all of the tabs in the tree view should have a green checkmark. 10. Please save the file one more time!!! Run and Results 1. Save file by clicking on save under File menu. 2. Now you are ready to run the simulation. Please click on Validate With IMEX, which can be found below the menu of Builder panel. 3. Click on Run Normal Immediately and wait until running finishes then press close. 4. You can now drag and drop the saved file onto the IMEX icon. (To run simulation).
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5. Go back to the main CMG Technology Launcher screen. Make sure to open desktop and refresh the screen by pressing Refresh icon. 6. The result file will be saved under the same folder of input file and will carry same name but with new extension (.irf) 7. To show results, use either Results 3D or Results Graph 8. Output file can be saved on Notepad by opening the file with extension (.out) under the same folder
Fig.1- Grid pressure at wcut=0.95
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