0

TOUGH3/ECO2M input problems

Dear TOUGH community,

 

I am using TOUGH3/ECO2M for modeling two injection scenarios: i) liquid CO2 (5C, 100 bar) and ii) SC-CO2 (35C, 100 bar) at the wellhead at constant temperature. I have tried several different setup from my side and, also, from suggestions I got, but so far nothing works. Here are the changes:

 

I) I refined the grid at the wellbore to capture better the effects especially in the first case scenario of liquid CO2 injection.

ii) I tried to "inject" CO2 at 0 kg/s rate, and also a cyclic injection which increases till 110 kg/s (desired injection rate) in a period of 60 seconds - none of them worked.

iii) I also tried to inject CO2 al constant low rate 5kg/s, but did not work. 

iv) In the INCON section, I tried for the wellhead block cell a X3 (CO2 mass fraction) equal to 0 (no CO2), to 1 (no water), 0.9 (CO2 with trace elements of water in the injected CO2) - but again nothing worked.

 

The different problems I was getting in the output were:

i) I get to high pressure values in short time (after 10 seconds, the pressure was over the pressure limit of 600 bar)

ii) There is a pressure drop in the two wellbore cells below to the wellhead one.

iii) There is CO2 flow from the wellbore to the caprock cells. I want only heat flow, but no fluid flow.

iv) There is flow coming out of the wellbore cell than is being added via GENER.

 

I please kindly ask for your help. I would really much appreciate it if you could take a look at my input file. I am attaching it. Thank you so much in advance!

 

Best regards,

Jose.

 

base_case_CMG_PyTOUGH_manual_refined.txt 

1 reply

null
    • kenny
    • 1 mth ago
    • Reported - view

    I did a quick look and found some problems. Once you correct the bugs in your input, the model should run normally. Main problems include:

    (1) MOP(15) =5 is not correct, forget the analytical heat exchange solution first: set MOP(15) =0

    (2) wrong data range for FE(3) and FE(4), set both to zero

    (3) Line 3 in "PARAM" data section is wrong, must be deleted.

    (4) Line 5 in "PARAM" data section is wrong (The leading TAB must be deleted).

    (5) The injection rate is too high with current parameters, try injection rate =0.1kg/s first.

    After all these changes, it should work. I am attaching the correct input files. Once the base case works OK, you can play around with different injection strategies.

     

    INFILE.workok

Content aside

  • 1 mth agoLast active
  • 1Replies
  • 29Views
  • 2 Following