Cell temperature higher than injected water temperature

[Mai MRST]

Hello MRST team,

I'm currently using a geothermal model in which I am injecting at 483.15 K with the rate of 20 000 m3/day into the depth of 500 m. When I inspect the cell in which the well perforates, the temperature of the cell can jump up to 513 K, about 30 K higher temperature than the injected temperature. 

I was wondering what could be causing this jump in higher temperature and how does increased injection rate play into this.

Here is temperature plot development in the perforated cell over time:

When injection rate is much lower (for example 2 000 m3/day) with temperature of 483.15 K, the model does not reach these elevated temperatures:

What is the explanation for the higher cell temperature with high injection?

Thank you in advance for your reply. 

Best wishes,

Mai

[Olav Møyner]

Hi,

This could be an enthalpy effect, since the high pressure difference will exact work on the fluid. This is consistent with lower rates reducing the effect (since the pressure difference is smaller)

Best regards,

Olav

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