I am testing the geostress distribution in the reservoir during cold water injection of the conventional oil production using OGS6’s TH2M module. Since my last post haven’t been replied now, I decided to simplify my model. So I delete the temperature source term which means a heat source in my model to let it degenerate into a HM model since I want to use this as a control to see how temperature affects the stress distribution in the primary fracturing process. As a result, only a pressure source term remains. Here follows my prj code:
test.zip (4.7 KB)
However, when I check the result, I found that the temperature in and around the injection area without a heat source still changes with time, and it seems nonnegligible since the temperature change reaches around 10K after 1h injection like the following picture.
In my opinion, without temperature difference defined by T source term the temperature in the area should keep constant during the process, which is validated from our previous models using THM module. I would like to know if this phenomenon is correct, and if so, how to explain it? If not, what’s the problem? I think it has something to do with phase transition theory, but I’m not sure.
I will appreciate it if anyone could explain my doubts.