How to Convert Black Oil Models Into Compositional Models_4381892_01

How to Convert Black Oil Models into Compositional Models using Multiflash for PIPESIM Knowledge of the type of reservoir fluid to model is one of the main requirements to run any PIPESIM Production System Analysis Software simulation. Black Oil and Compositional models are available in PIPESIM throughout the GUI or by using PVT or MFL files. The black oil model is used for simulating dry gas, water and non volatile oils while the compositional model is best suited for light oils, condensates and natural gases. Any reservoir fluid could be described using a compositional model which allows more detailed analysis of the fluid behavior. However, the user not always has compositional data and is forced to use a black oil model without being able to analyze further problems like flow assurance issues. The black oil analysis within Multiflash for Windows offers the user an opportunity to take a very limited input specification (known as Black Oil input) and from this generate a normal compositional analysis. Procedure: 1. Open PIPESIM application and go to Setup > MFL file to open the Composition/PVT File DEFAULT window. 2. Click Create New to open Multiflash for Windows from InfoChem. 3. Go to File > Save Problem Set Up…; Up…; save your model. 4. Go to Select > Units and click OK; OK; choose the units of your preference (Ex. All British). 5. Go to Select > Model set…; set…; select the desired model under Equations of State Tab (See Multiflash for Windows user guide for detailed explanation on model selection or leave default selections) click Define Model. Model. A message showing your selection will pop up, click OK and close the Select Model Set window. 6. Go to Select > PVT Lab Input… ; select the Black Oil Analysis tab and enter Minimum input for Black Oil Analysis (the user has the option to enter values of SARA Analysis, Analysis, Wax Content and Water Cut (as % of total liquid)) liquid)) as shown in Fig. 1, 1, click Do Characterization. Characterization . A message saying “Black oil characterization successfully completed” should pop up, click OK and close the PVT Lab Fluid Analysis window.

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Figure 1: Black Oil Data Input Window.

7. Go to Table > PIPESIM; PIPESIM; enter an arbitrary name for the file with .pvt extension (Ex. Table.pvt). Enter Starting Point and Finishing Point for pressure and temperature grids as well as N of Points (the maximum number of points is 50 for each variable) click calculate table (See Fig. 2). 2). A message saying that the Pipesim table has been written to file: name_file.pvt on the Multiflash main page will be displayed. Close Pipesim Table window. °

Figure 2: Creating PIPESIM Table.

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8. Close Multiflash and Composition/PVT file Default window. 9. Go to Setup > Compositional and click Import button; select your file and click Open. Open. A message saying “The viscosity model is invalid; setting it to Pedersen” will be displayed (PIPESIM doesn’t recognize the viscosity model used in Multiflash so it will be using it own viscosity model) click OK and you will get your composition in the compositional GUI. This composition can now be used in PIPESIM as an approximation to generate phase envelopes and analyze fluid behavior. However, the user has to be aware of the fact that the generated composition is just an estimate and should not be considered as final. Example Data Set: Table 1: Black Oil Composition Water Cut % 10 GOR 500 Gas SG 0.8 Water SG 1.05 Oil API/Oil SG 36/0.844776 Table 2: Converted Composition Component Moles WATER 71.398 METHANE 30.591 ETHANE 6.7517 PROPANE 4.0802 N-BUTANE 2.4658 C5 6.3511 C6-15 34.601 C15-22 8.4805 C22-30 4.1829 C30-43 1.9584 C43+ 0.53677

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