Error message enquiry on script file pressure-buildup\pressure_buildup_dual_porosity.m

[Xxx Nkeng George Elambo]

Dear MRST team, 

In trying to simulate pressure buildup in fractured Aquifers during CO2 storage operations, I came across a script file titled  "pressure-buildup\pressure_buildup_dual_porosity.m". The example in the book explains a water and gas model.  I noticed that in line 25, the phases were defined for Water and Oil ('WO') as follows;

fluid_fracture = initSimpleADIFluid('phases', 'WO',...

'c', [1e-10,0],...

'rho', [rhow,rhoco2],...

'mu', [1,0.04]*centi*poise); 

So, I tried restructuring the model with fluid_fracture = initSimpleADIFluid('phases', 'WG',...

'c', [1e-10,0],...

'rho', [rhow,rhoco2],...

'mu', [1,0.04]*centi*poise);

but I received an error message which I will attached to this email.

Please, I am curious to know why the phases were defined for a water and oil system ('WO') and not ('WG') in this case ?

[XiuWei Liu]

Hi, 

This example uses TwoPhaseOilWaterModel in which phases are defined as 'WO' in the fluid structure.

And TwoPhaseOilWaterModel is for a immiscible two-phases (water and oil) flow, so you can change the oil properties (density and viscosity) into gas properties to simulate water-gas problem but still 'WO' is defined in the fluid structure.

Best regards,

Xiuwei

[Xxx Nkeng George Elambo]

Thank you very much for this clarification, this helps me proceed with my analysis.

Please I just have a follow up question. Does the TwoPhaseWaterGasModel simulate immiscible two phase fluids as well ?

Kind regards, 

George.

[Olav Møyner]

Hi George,

Yes, the two-phase water gas model is also immiscible.

Best regards,

Olav

---

From: sinte...@googlegroups.com <sinte...@googlegroups.com> on behalf of Xxx Nkeng George Elambo <xxx.nkengg...@studenti.unipd.it>
Sent: Thursday, June 27, 2024 11:24
To: MRST-users: The Matlab Reservoir Simulation Toolbox User Group <sinte...@googlegroups.com>
Subject: [MRST Users] Re: Error message enquiry on script file pressure-buildup\pressure_buildup_dual_porosity.m

 

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[Xxx Nkeng George Elambo]

Thank you very much, I really appreciate your help.

Kind regards, 

George.