AMCHE

Hi all! I am looking at WAG cycles (water-CO2) through a chalk reservoir with petrasim. The only options I see for the water-injection is under the source-sink tab, but this only gives me the option of water-injection-rate and its enthalpy. How do I control/specify the composition of the injected water and its temperature compared to the defined formation water already present? Any help is greatly appreciated. Thanks :-) Anne-Mette

Hi there, I get this message now and again. The reason is normally due to the fact that you have defined a mineral, lets say Calcite, but forgot to define an important constituent of the mineral as, e.g., Ca2+. You can see in the chdump file which minerals was not properly defined and then go in and define the components. I hope that was helpfull :-) Mette

Hi Lynn, I am having exactly the same problems. I can create boundaries between layers (sometimes if I am lucky) from contour files, but no regions. As I do not have the version 5 yet, is it possible to create boundaries in version 4, and how? Any help greatly appreciated! Mette

Hi Alison, Thank you for the information! When you say that you will have a new build this week - does it then mean that there will be a new version of PetraSim available; and how do I get acces to it? I can indeed correct the input files, writing the species in question I would like to equilibrate the fluid with - but I have absolutely no clue as to how to run the program/model manually? Could I run it as a "restart/initial conditions" problem; or would I still get error messages? Thank you for your help again :-) PS: With regard to my earlier question about the Fe - O2 errors; I have no problems with pressure or Fe and O2(aq) components when running the flow of the specified fluid.... (which is why I was then trying the ICON2, to see what was the "right" values of my fluid). I have gone over the fluid composition so many times, and also corrected and also tried equilibrating it in programs like PhreeQC. I find no problems with it; but PetraSim does. I thought that the funny pressure evolution could be due to boundary conditions in my 1D model - and have played around with large volumes of the lower cell, thinking this might be a problem with the height of the column, but no luck. Also different boundary conditions (as I have tried them) does not change the error messages in the runlog output file.

Hei again! Re my earlier question using the ICON1 option when specifying the aqueous solution in TOUGHREACT/Petrasim; I tried to use the ICON2 option instead for defining the water zone. I used log(Q/K) = QKSAT 0 after having given in the "guessed totals"; but it is impossible for me to write a mineral species in the column [NAMEQ]. Is there a bug in the program? It does not accept any (defined) mineral name I give in in this column, and the runlog file tells me that it can not run when no species are written in this column (logically). How come it will not accept names like e.g., hematite? Any help is greatly appreciated; thanks :-) Anne-Mette

Hi all! This might be a triviel question, but as I have now used a lot of time on it without getting any further - I hope you can help me. I am trying to simulate CO2-sequestration with toughreact and ECO2. I have build a very simple 1D model in two parts: sandstone and shale and given each region their respective chemical parameters which are real analyses and not proxies. Off course - all though the real rocks are in equilibrium - I do not expect them to be in the program and want to equilibrate the fluid used before adding gas. However, no matter what I do, I get conflicts with my O2(aq) and/or Fe concentrations, and the program runs reaaaaallllly, reallllly sloooooooooow plus doing funny things with the defined pressure. It seems very much like a numerical thing; and I have gone through the set-up over and over again, but am not any wiser.... Can anyone help me on from here, please - and thanks Best, Mette

Dear Matt (and others), I am using the PetraSim software for modelling CO2 sequestration. In order to look at both advective as well as diffuse scenarios affecting the caprock, I am, as a first step trying to equilibrate the rock fluid to a choosen mineralogy of both a reservoir and a caprock region in the model before adding a gas phase. I find no problems in doing that. However, when I add gas, and prepare to set up for a restart run, using the equilibrated system I get the same error of “Element (*number*) in data block “ Goft†does not have a valid “Gener†item –ignore this and proceed “, and the system chrashes. This is also the case when running the "gas-scenario" without equilibration of the fluid. I have first started using the program; and suspect it is due to my unexperience. I would very much welcome any clue as to why set-up fails; thanks Anne-Mette

Dear Matt (and others), I am using the PetraSim software for modelling CO2 sequestration. In order to look at both advective as well as diffuse scenarios affecting the caprock, I am, as a first step trying to equilibrate the rock fluid to a choosen mineralogy of both a reservoir and a caprock region in the model before adding a gas phase. I find no problems in doing that. However, when I add gas, and prepare to set up for a restart run, using the equilibrated system I get the same error of “Element (*number*) in data block “ Goft†does not have a valid “Gener†item –ignore this and proceed “, and the system chrashes. This is also the case when running the "gas-scenario" without equilibration of the fluid. I have first started using the program; and suspect it is due to my unexperience. I would very much welcome any clue as to why set-up fails; thanks Anne-Mette