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About Alison

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  1. The pressure represents the flowing bottom hole pressure described by the TOUGH2 manual (introduced on page 64). PetraSim includes a Start-up time option that is not available in the standard version of TOUGH2. You may be able to create multiple wells that fall into the same cells that start up at different times (presumably, the pressure in the producing wells would decrease with time, so you would start up new wells with lower flowing bottom hole pressures at later times in the model). You could also restart your model at the times where you need the pressure to change or for certain wells to be disabled (which is probably how people using the standard version of TOUGH2 handle this).
  2. Hi Julia, My suggestions would be to either: 1. Store date information in the Caption field 2. Add a custom field to the Well Construction table to store date information Unfortunately, neither of these fields can be queried during plotting, but you would at least have a way to identify when each item in the well table was in place. Maybe other users will have some suggestions as well. Best Regards, Alison
  3. I agree that it is strange that changing the output settings would affect the simulation run. I think its possible that adding specific print times would do this, as it changes the time steps required by the simulation. Changing the number of time steps output shouldn't change the simulation. I would be happy to take a look at your simulation and see if I can determine what is going on. Please send your SIM file to Alison @ You also might want to post this question on the TOUGH2/T2VOC forum supported by LBNL, as the TOUGH2 authors are really the most qualified to answer questions like this. Best Regards, Alison
  4. These parameters are described in the TOUGHREACT manual starting on page 31. CGUESS: initial guess for the concentration of the individual primary species (not total concentration), in moles/kg H2O (molal) for species other than H2O and in kg for H2O. Input values of CGUESS do not affect results of speciation calculations, but could affect the number of chemical iterations required during initial speciation computations. CTOT: if ICON=1, CTOT is total moles of aqueous species, and total amount (in kg) of liquid water for H2O. Molalities are then internally computed as CTOT/CTOT(h2o). If ICON > 1, refer to the discussion of ICON above for the meaning of CTOT.
  5. The mass fraction is based on units of mass (so grams of salt per grams of water).
  6. Hi Yuki, If you mean production of energy, yes, I would expect that to decrease over time assuming you are pumping cooler water into the model. If you mean the actual amount of water coming out of the wells, then I would think that there are many factors that are coming into play that might effect this (such as the type of production well you are using in the model). For example, are you using a constant mass out production well, or a well on deliverability production well? Best Regards, Alison
  7. It sounds like you are running into convergence problems, but its hard to know what could be causing these problems without looking at your model. I would recommend that you look at the output file to determine what model element is causing the problem. The simulation includes information about the element with the highest residual for each time step. You might try rerunning your model with the print options for this cell turned on, so that you can look more closely at the state of the cell as the model proceeds. Its possible that it is reaching a pressure/temperature not supported by the simulator. If you continue to have problems, you can send the SIM file directly to me at Alison @ Best Regards, Alison
  8. Julia, I can't think of a faster way to do this. I believe that the DXF and contours still require that the program re-triangulate the surface, so it probably wouldn't speed up the process. I do think that removing internal boundaries could possibly help, as the creation of regions can be pretty time consuming. Best Regards, Alison
  9. You are correct, "Dist. to" is the distance between the center of the connecting (geometric) cell and the connection to the extra cell. Dist. This is the distance of the connection in the extra cell. Depending on what you are trying to represent with an extra cell, these distances could be very large (for example, if you are trying to represent the atmosphere) or very small (for example, if you are trying to represent a well bore).
  10. Dear Lang, Unfortunately, I don't know the answer to this question. My guess is that it is the ratio of the diffusivity in the free space to the diffusivity in the porous medium, but you may want to ask the authors of TOUGH2 this question on the LBNL TOUGH2 forum. Best Regards, Alison
  11. I'm sorry, but I'm not sure how to answer your question. If you would like to send your SIM file to Alison @, I would be happy to look into this further. Best Regards, Alison
  12. I reviewed the SAVE files and found that this is a problem with restarting a TOUGHREACT model where the number of times steps has exceeded 99,999. The number of time steps is listed at the bottom of the SAVE file. For models with more than 99,999 time steps, the files lists a series of * symbols, as there are only 5 spaces allowed to store this information. Changing this to an actual number such as 00001 resolves the problem and the model will run correctly.
  13. Another option is to use ReportWorks (which is included with RockWorks). You can scale your map in paper space and have more options with respect to the format of the scale bar.
  14. We have added this as a bug in our database and will try to fix it in the next maintenance release. In the meantime, you would have to take a screen shot of the linear legend and manually change the legend labels in a graphics program if you need a linear legend with logarithmic labels. We have put together an excel file that will help you calculate the appropriate labels for a given data range. If anyone else needs this, please contact me at alison and I will send this to you. Thanks, Alison
  15. Dear Lang Zou, You cannot create a grid with non-vertical boundaries in PetraSim. You would have to rotate the gravity vector about a flat grid to get the model you want. To do this, go to Properties / Global Properties and click on the Misc. tab. Best Regards, Alison