Hydromechanical Slug Test Example
This is an analysis of a hydromechanical slug test in a vertical well intersecting a single, flat lying fracture. The analysis considers a rapid rise in head in the wellbore followed by a drop in head as the water in the well flows into the fracture. A similar analysis was done as part of NSF EAR 00011436 and is described by Murdoch and
| Germanovich (2006). The analysis is done using a code called DFrx, which is more than 70 pages of Fortran. The analysis developed using the multiphysics code gives similar results to DFrx and run times for both codes is roughly several minutes. I still need to verify the multiphysics code, but the preliminary results have the same signature as the DFrx codes, and I am confident that the verification will be satisfactory. |
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Cross-section of axial symmetric model for hydromechanical slug test |
One exciting aspect of the multiphysics approach is that the file that I used for the analysis can be downloaded and used by others, much as any file can be downloaded. The difference is that the multiphysics file, and accompanying report, can be used to learn how the original analysis was conducted and it can provide the basis for a new analysis that would include additional processes. It would be extremely time consuming for someone to do this with the DFrx code.
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| Displacement as a function of head during as slug test. The loop shape is a characteristic of the hydromechanical response. | Axial displacement (red) and head (blue) in a wellbore as a function of time during a slug test |
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Last Updated:
April 10, 2006
-- Questions or comments, contact Larry Murdoch.
School of Environment, Department of Geological Sciences
340 Brackett Hall, Clemson, SC 29634 USA -- Telephone: (864) 656-3438, Fax: (864) 656-1041
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