Practice Material Notes 1 – Building a Model in Petrel from Scratch PDF

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Summary

Practice Notes on Building a Model in Petrel from Scratch in reservoir modelling of a real field development project....

Description

Building a Dummy Model in Petrel from Scratch

Creating a Favorite Pane with Useful Processes Favorite pane is a very useful and practical functionality added to Petrel. It helps new and experienced users to have all the processes they need in one pane and just simply navigate through those processes. Beginners and users that use Petrel less frequently tend not to remember where to find a specific process and favorite will organize their frequently used processes handy. Also advanced users can benefit this functionality during presentation to higher manager where the simply follow the process tree that they have organized in favorite pane. Steps: 1.

Open an empty Petrel project.

2.

Save the project in a directory of your choice

3.

From Menu bar go to Project>Project Settings and select Coordinate and units tab 4. Change Unit system and Simulation units in this tab and click on “OK”. I have selected Field.

5.

If the Favorite pane is not visualized, from Menu bar go to View>Panes and select Favorite. You should now be able to see Favorite pane.

6.

Now go through the processes in Processes pane and Drag-&-Drop the ones that you use the most in Favorite pane

7.

In this case I chose: •

Make simple grid

•

Make Horizons

•

Make Zones

•

Layering

•

Geometrical modeling

•

Make/edit polygons

•

Make/edit surface

•

Well completion design

•

Make fluid model

•

Make rock physics functions

•

Fault analysis

•

Make development strategy

•

Make local grids

•

Define well segmentation

•

Define simulation case

•

Pillar gridding

•

Scale up structure

•

Scale up properties

With this, I can now call on each process from Favorite pane rather than Processes pane. This makes life easier and I don’t need to repeat Processes pane and each process-group header name (e.g. Simulation, Utilities etc.). For example instead of saying “open Make Simple Grid process from Processes pane, under Utilities” I’ll just say “Open Make Simple Grid”, since we know that all the processes that we are going to used are already in Favorite pane.

Building a Simple Grid To build a very simple 3D model for example (11*11*11) without any input at all. The model will look like a box with no topography and later, simulation fault can be added to it.

Steps: 1.

Open Make simple grid and give the new grid a name (I have called it Fine Grid).

2.

Select Input data tab and fill the Top and Base limits as below. These are top and bottom of the model we are creating (in this case 100 ft thick reservoir). Note: We do not have any data (here: Surfaces) available, hence we select Skeleton only option as below.

3.

Click on Geometry tab and fill the boxes. This is the extent of your model in X and Y direction and you can input any value you want.

4.

The result of this process is a new grid skeleton in Model pane.

5.

Open a 3D or 2D window and visualize Top/Mid/Base skeleton of Fine Grid (Expand New model>Expand Fine Grid>Expand Skeleton) We have the skeleton and areal gridding, now we should build the layers or vertical divisions of the model.

6.

Right click on Skeleton and select Convert to surface. The result is Top/Mid/Base surfaces in Input pane as below. We need these surfaces to create horizons later on.

7.

Open Make Horizons and append 3 lines as shown below and select and drop Top/Mid/Base surfaces that we just created in previous step (Input pane) into Input #1 in pop up window.

We now have two horizons in our model and basically the reservoir is divided into two parts, upper and lower. You can visualize Horizons, Edges and intersections from Model pane in 3D window and see how your model look likes so far. By default we have two zones (upper and lower) and we now need to further sub-divide them into layers. We skip Make zones process and go straight to Layering.

8.

Open Layering process and set each zone to 5, then we will have a model with 10 layers.

The model is now ready to be populated by properties (PORO, PERM etc). If you look at the Edges, you can see that layering has been done correctly (10 layers). However, because the properties are not populated we cannot see the 3D grids yet.

9.

Go to Model pane and right click on Properties and select Calculator. Here you can set PERM, PORO, NTG etc. Make sure you select a correct template for each property. Note that you can use Functions and Geometry options for some practical functionalities like Ran(Min, Max) that randomly distributes a property based on Min and Max value specified.

10.

In 3D now you should be able to visualize PORO and PERMs under Properties....