Having Problem in Black Oil Reservoir Simulation with Active Wells and Rate Constraints

[Mukhammad Sholikhuddin]

Hello MRST users,

I built a simple black oil reservoir model of 1 production well and 1 water injection well, with fluid data I took from setupSPE1(), for grid, rock, model, and state I defined separately. During the simulation process I experienced several problems including:

1. Where when there are 2 active wells (production and injection) I experienced problems (Solver did not converge), causing the simulation to stop

2. When there is only 1 active well (production) and constraints using rate, the well bhp value continues to increase (this is not natural)

3. And when the production well uses rate constraints, I get a warning (Warning: Given sign does not match sign of given value. Setting w.sign = sign( w.val ) ), even though I already state the sign correctly (-1 for production and 1 for injection)

I also included my code for more details.

Related to this, is there something wrong during the modeling process, and how to solve the above problems

Thank you

[Olav Møyner]

Hi,

You have to make the production rate negative, otherwise it will inject the rate. I think this explains the pressure buildup and the message you are getting (a producer is provided a positive rate).

Best regards,

Olav 

Olav

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Subject: [MRST Users] Having Problem in Black Oil Reservoir Simulation with Active Wells and Rate Constraints

 

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[Mukhammad Sholikhuddin]

Hi Olav,

Thank you very much for your help, now all the problems I experienced have been answered with that