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Increasing Injection Rate

INCON INFILE MESH

I am currently working on a model where the reservoir permeability is only a few mD, but the injection rate is set at 3 kg/s. In the existing model, when the injection rate reaches 0.2 kg/s, the pressure approaches 600 bar, while the model runs normally at 0.1 kg/s. I would like to increase the injection rate but prefer not to change the reservoir permeability by orders of magnitude. Is it possible to achieve this using only TOUGH2-ECO2N? If so, what steps should I take? I have already tried refining the grid and adjusting lithology parameters. Are there any other approaches that might work?

I have attached a simplified input file for your reference. I would greatly appreciate it if you could take a look and provide any suggestions.

Thank you very much for your time and assistance!

Best regards

2 replies

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    • kenny
    • 3 mths ago
    • Reported - view

    The injection rate must be physically meaningful. If the formation permeability/porosity remains the same, you have to increase the "mobility" of injection fluid to get higher injection rate. Fluid parameters such as viscosity, density, relative permeability may have an impact on mobility. If the reservoir has a higher temperature and/or higher gas saturation, it may allow slightly higher injection rate for a given pressure limitation. 

      • Tang_Jingya
      • 3 mths ago
      • Reported - view

       Thank you very much for your response. Perhaps I should focus on understanding how these parameters affect the "mobility" of the injection fluid. Can this be understood from the manual, or should I also look into the source code? Additionally, when you mentioned "a given pressure limitation," am I correct in understanding that this involves setting a maximum pressure in INCON and then running the simulation with constant pressure at the corresponding grid?

      I look forward to your response.

      Thank you very much for your time and assistance!

      Best regards

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