How to ru n a Nodal Nodal Analy sis w ith PipeSIM
Introduction This document is intended to provide a basic tutorial to run a single Nodal Analysis using PipeSIM software, helping the first time user to familiarize with the software functionalities while providing easy access to screens for data input and options to start with. At first sight PipeSIM PipeSIM looks very complicated and and tricky, because the application of the software goes beyond a single well analysis. As soon as Field Users get familiar with the so ftware they will find a very powerful tool to perform either quick and easy estimations or complicated and well-engineered evaluations. Important to mention is that the software provides a rich “Help”, where users will be able to find good tutorials and guidance that solve most of the questions. The User Guide, included in the installation and the documentation available in PipeSIM Reference Page in InTouch will also help the users to master the application. Nodal Analysis theory will not be discussed in this document. Tutorial structure This following conventions and structure is applied to this tutorial: •
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A problem example is given. That information will will be used to fill the screens. The outlined steps are specifically designed to accomplish what is required i n the problem example. The Red boxes indicate the steps to to follow. Follow the steps in the order specified The Blue boxes are intended to provide complementary information. The gray areas are designated to specify useful Tips.
Problem: Problem : Using the following data, construct a basic well model and determine what will be production of the well after an acidizing treatment if the skin is lowered to zero. Fluid Properties (Black Oil): Water Cut GOR Gas SG Water SG Oil API
10 % 500 scf/stb 0.8 1.05 36°
Wellbore data: MD (ft) 0 1000 2500 5000 7500 9000
TVD (ft) 0 1000 2450 4850 7200 8550
MD (ft) 0 9000
Temp (°F) 50 200
Geothermal Gradient:
Tubing Data: Bottom MD (ft) 8600 9000
ID (in) 2.992 6.184
OD (in) 3.5 7.0
Reservoir and Completion Model: Completion model: Single Perforations Reservoir Pressure Perforated Interval Reservoir Temperature Permeability Porosity Wellbore radius Skin (from Build up test)
3600 psia 8660 to 8700 ft 200 °F 100 mD 12 % 4.25 in 10
Workflow Steps 1. Open PipeSIM and after the “Tips” screen (if activated) you will find this menu:
1. Select Wizard to build the Model Single well and Pipeline Models Options
Blank screen to create your own model Self explanatory
Multiple Wells and Production Systems
Tips: A new model can be created anytime using the Wizard accessible in two additional ways:
Wizard Icon
2. Creating a model using the WIZARD. For Instructions to create a model without the Wizard go to Section 7.0. 2.1. Click on the Wizard option and fill the required general project information
2. Fill out the Project Data
Screen by screen guide to fill up the required data Open the specific help page from the PipeSIM Help Menu
3. Go to the next screen 2.2. Click on Next button to Open the Single Branch Profile or Single Well Profile:
4. Option for Producer Well
5. Nodal Analysis from dropdown 6. Select the position of the Node
7. Select your working directory and
name your file
8. Go to the next
Tips: - More information about Operation Type option (system Analysis, Pressure/Temperature Profile, etc) can be found in PipeSIM Help: PipeSIM Help Operations. - More information on how to build a model go to: PipeSIM Help How do I…? Steps in Building Models. - The User Guide also provides information about these topics.
2.3. Setting the Units for the Analysis
9. Select En lish
10. Verify units
11. Go to the Next
Tips: The Custom option activates additional features. You can save a fil e with customized units for use in future simulations.
The Units Screen can be accessed anytime from Main menu:
Setup units Information about this screen in PipeSIM Help:
Multiflash Units
2.4. Fluid Properties Screen
12. Select Fluid Model
Use this option for more accurate simulations (Volatile oil, Gas Condensate)
13. Define Fluid Properties
If PVT data is available, the simulation can be improved by using these options. 14. Fill the Fluid
15. Provide the fluid
If PVT data was used you can create a file to be used in future simulations or share with other users
information
Select the correlation that better fits to your fluid ro erties.
16. Click OK, then
Next in the Fluid Properties Screen
Tips: -
Information about Fluid Models can be found in PipeSIM Help:
Component and Options Fluid Modeling - In the User Guide go to: Model Overview Fluid Data
2.5. Flow correlations screen
17. Source of Flow correlations 18. Select the correlation
Use this option when pipeline is modeled.
19. Click Next
Tips: -
Details about what correlation apply in every situation can be found in PipeSIM Help:
Component and Options Flow Correlations - The Friction Holdup Factors are used to calibrate field data. -
Use Single Phase for Water injector wells This screen can be accessed anytime from the Main menu:
Setup Flow Correlations
2.6. Final screen to define the profile of the single well.
20. Define the completion type
21. Add the tubing
22. Click Finish to create
the Basic Model
2.7. Basic model created.
Wellhead before choke or any other equipment Represents the reservoir and completion (open hole, perforations, gravel pack, etc.) Represents the node Represents the well
The red rectangle means that basic information is missing
3. Entering Reservoir Information
23. Double click
the Completion 25. Select the Reservoir
Model
24. Fill the reservoir Data
26. Complete the Reservoir
Information 27. Accept the data and
close the screen
Tips: -
Information about Model Type in PipeSIM Help:
Components and Options Well Performance Analysis Module - Use the Plot IPR option to create a quick IPR plot of your completion.
-
Detailed completion data for skin calculations can be used. Rate Dependent Skin, also known as Turbulence Factor in other Nodal Analysis programs.
4. Entering Well Information
The Simple Model could be used; however, no detail survey can be entered in Single Model option 32. Go to Geothermal
Survey to input temperature data. 28. Double click
on the Tubing Icon
30. Fill the survey
29. Select the dependent
data
parameter 31. Calculate the Angle
4.1. Entering Temperature Data
34. Go to Tubing
Configurations to complete the well data. 33. Enter surface
and bottomhole temperature. MD or TVD, depending on data available
4.2. Entering Tubing and Casing Information
35. Fill the tubing
This data is not required unless there is flow through the annulus.
bottom depth and IDs. Basically the flow conduit
Set the last depth at top of perforations, not bottomhole.
36. Click OK to accept
the data and close the
Tips: -
More Information about this screen in PipeSIM Help:
Components and Options Well Performance and Analysis Module Tubing -
Use the Backspace key to delete data from cells (Do not use Delete, Space or 0 keys) Set the last depth of tubing at the top of perforations/completion. Think on this as the fluid path from completion to surface. Another good option is to use Single Model as the Tubing Model, then convert the model to Detailed and fill out the additional required information as the detailed survey. You may have data filled in both Tubing Models screens (Detailed and Single), the software will use the data from the Preferred Tubing Model option selected in this screen.
5. Running the Nodal Analysis
38. It will ask you to save your
Job if you did not do it before. 37. From the Main menu Select
Operations Nodal Analysis
39. Define the
Wellhead Pressure
40. Select the “Object”
for Sensitivity 41. Select Skin as
variable to sensitize 42a. This is to run sensitivities
This is the name of your Reservoir/Completion to select as the “Object”
on IPR curve (fluid, production, and reservoir data). For example, manually enter the Initial and Final Skin for the simulation. 42b. This is to run sensitivities on
TIC (fluid, production, and tubing data).
43. Run the Model
Run different sensitivity on the IPR and TIC to match the simulated BH node (Q, BHFP) with the real production data. Tips: -
-
When Inflow/Outflow sensitivity is used, the simulation will run with the data entered in this screen only, not with original data. When comparison with original values is required, include those values in this screen. Put a name to your completion for better identification. More information in the PipeSIM Help: Operations Nodal Analysis If you want the intersection between the Inflow and Outflow curves displayed in the Report, include data for both, even though you are not doing Sensitivity Analysis for Outflow.
6. Final Plot and Report 6.1. A Nodal Analysis Plot will be created after finishing the simulation.
Use this Menu to Edit the Plot as desired
Drag a Box, with the left click, anywhere From Upper Left to Lower Right to zoom the graph. A small box from bottom to top will restore the original plot
Use the right click to drag the plot and displace the scales
To simulate the effect of a velocity string, run different cases with different tubing ID and length. Notice that the minimum liquid loading decreases with smaller tubing ID.
6.2. Go back to the Main Screen and Select the options: Reports User Reports (Nodal Analysis)
44. Select the User Defined
Report option
45. Select the Report
O tions and Click OK
A neat report ready to present will be created.
7. Building a Model Without the “Wizard”. Start with a Blank Screen selecting the New Single Branch Model Option
1. Left Click on the Vertical Completion Icon (Do not drag)
2. Left Click on any spot on the screen. The vertical completion will show up
3. Do the same with the Boundary Node
4. And the Node for the Nodal Analysis at bottomhole
5. Left Click on Tubing Icon.
7. Select a Connector Icon
6. Left Click and drag the mouse from the Node to the Upper Boundary icons (Connect them)
8. Connect the Reservoir to the Node
Model Completed. Fill the information about the Project Data, Reservoir Fluids and Flow Correlations usin g the Setup Menu. Follow the Instructions provided in Sections 2.1 through 2.5
Tips:
- You can “Save” your basic Models and use them as template for future simulations. It is not necessary to create a New Model every time you require running a Nodal Analysis
8. System Analysis: The system analysis is run to help you decide which flow correlation to use You can always change your flow correlation to match your BH production node (Q, BHFP) as follow:
But you can run sensitivity based on different flow correlations to decide which is better for your case:
-BHFP to be calculated versus TVD -WHP input -Flow rate input
Select different flow correlations. See help to decide which ones are good for your case.
Select the flow correlation which gives a close BHFP to your case.
9. References and useful information about PipeSIM: • • •
•
PipeSIM Reference Page InTouch, content ID 3381331. PipeSIM User Guide. This comes with the PipeSIM installation InTouch Content number 3846744: Nodal Analysis: A Workflow Comparison of Prosper, Wellflo, Perform & PIPESIM. This document is based on an older version of PipeSIM; however, many of the conclusions are still valid. PipeSIM 2006.1 Fundamentals Manual. Located in the following link:
http://omniworks.slb.com/SGL/OmniWorks/sis_training/training_materials/SIS_Production_Training_Materials.htm
