[COMSOL Multiphysics] How can I model heat/pressure transfer along open/screen intervals of a borehole located in a porous media ?

03 March 2016 2 8K Report

Hi everyone,

I am trying to model heat and mass transfer in a pipe flow that is opened along two screen intervals (see attached file). For that purpose I use the non-isothermal pipe-flow interface coupled with Darcy's law and heat transfer in porous media interface.

Because of the length involved, I do not want to solve heat and flow in complete 3D along borehole and I used the 1D edge element to model the heat transfer (provided with the non-isothermal interface). It appears accounting for screened intervals is not trivial. For that I used fracture flow in porous media, which is an extension of Darcy's Law for highly conductive element. It allows the fluid to go in and out from the pipe with reference to reservoir pressure and temperature.

Therefore I had a few questions : is it the best way to account for opened interval in pipe flow ? What could be the boundary conditions related to pipe inlet/outlet and fracture flow ? How can I achieve coupling between physics ?

Thank you for any help you can give on this issue.

Best regards.

Morgan Le Lous

Abderrachid Hamrani

Hi,

I advice you to take a look to the following urls:

https://www.youtube.com/watch?v=f4EoCvhEc6s

https://www.comsol.com/blogs/modeling-reacting-flow-porous-media/

Best regards

Morgan Le Lous

Dear Abderrachid Hamrani,

Thank you for your answer. As specified, a full 3D mesh is not an option considering the model size. Thus the proposed method does not seem to fulfill the requirements of such study.

In the meantime, I found a solution that is to connect the 1D well pipe geometries (non-isothermal flow physics) to the 2D well screen geometries (fracture Darcy’s Law and fracture heat transfer in porous media physics). Connections are made with the integration operator and the average operator set in the definition section. Fracture is automatically integrated to the 3D Darcy’s Law and heat transfer in porous media physics dealing with reservoir output variables.

This methodology, applied on a small pilot model, is described on the file added to this post (in french).

Best regards.

Morgan

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