[Opm] Problem with injecting field voidage replacement

Stephen, Karl D K.D.Stephen at hw.ac.uk
Sat Mar 16 20:02:04 UTC 2019


Thanks again, Kai.

You are right, I was forgetting that WCONINJ would set the target rate and that it's not quite sufficient. 

I've tried to minimise the effect of pressure on B_w by reducing the pressure sensitivity but not too much in case I get numerical instabilities. 

With your suggestion I get pretty much the same result as you (but not precisely the same). You don't show t=0 for one thing and there's a small difference.

Now if I increase Bw above 1.0 (to 1.02 as desired), I run into convergence issues. Do you get that to work?

With Bw=0.99, the pressure now drops (as indicate in my previous e-mail). 

I would really expect a stable answer regardless of Bw.

Karl



-----Original Message-----
From: Opm <opm-bounces at opm-project.org> On Behalf Of Bao Kai
Sent: 15 March 2019 21:58
To: opm at opm-project.org
Subject: Re: [Opm] Problem with injecting field voidage replacement

Hi, Karl,

It looks like there is a possible bug in the OPM implementation which requires some WCONINJE keyword for a injector to make the injector work, even if you have group control upon it.  (something we need to investigate it)

Anyway, I could not see big problem with your output data.  When INJ is working under group control, it looks like FVIR == FGPR, which means the group control is honored in a good way.

But INJ also has its own injection rate limit 11000  (provided with
WCONINJE) and it works under this limit at the beginning then switch to work under VREP group control later.

When you set B_w == 1.0 in PVTW, due to the existence of compressibility, the final B_w will be slightly different from 1.0 depending the pressure you use.

The FPR is decreasing in the beginning is because the voidage rate you are injecting is smaller than the voidage rate you are producing, (FVIR < FVPR due to existence of the WCONINJE injection rate limit.)

One solution is just increase the rate limit in WCONINJE so that that limit is so high and it will not limit much. The INJ will always work under group VREP control.


I changed the schedule as follows,

```
-- Production control
--  Well  Status  Control    Oil   Wat   Gas    Liq  Resv   BHP
--  name           mode     rate  rate  rate   rate  rate  limit
--  ----  ------  ------    ----  ----  ----   ----  ----  -----
WCONPROD
     PROD   OPEN      LRAT             3*          10000  1*   2000  /
/

-- Injection control
--  Well  Fluid  Status  Control   Surf   Resv   BHP
--  NAME  TYPE            mode     rate   rate  limit
--  ----  -----  ------  -------   ----   ----  -----
WCONINJE
     INJ    WATER  OPEN       RATE     110000        1*           6000 /
/
--  GRO  Fluid  Control   Surf     Resv   ReInj  Voidage  GRUP
--  NAME  TYPE   mode     rate     rate   frac   Frac     CNTL
--  ----  -----  ------  -------   ----   ----   ----     ----  -----
GCONINJE
--    FIELD    WATER   VREP        3*          1.0       NO   /
    G1       WATER   VREP        3*          1.0       /
/


-- Number and size (days) of timesteps
TSTEP
  10*200 /
```

Then the result is

 summary.x TUT1G1_SPE9. FPR FVIR FVPR
-- Days   dd/mm/yyyy                FPR             FVIR             FVPR
--------------------------------------------------------------------------
   1.00   02/01/2020            4498.11          11499.4          11499.4
   4.00   05/01/2020            4496.79          11499.3          11499.3
  13.00   14/01/2020            4495.43          11499.4          11499.4
  40.00   10/02/2020            4491.98          11499.5          11499.5
 121.00   01/05/2020            4485.95          11497.8          11497.8
 200.00   19/07/2020            4481.67          11491.7          11491.7
 400.00   04/02/2021            4475.47          11424.2          11424.2
 600.00   23/08/2021            4472.37          11292.4          11292.4
 800.00   11/03/2022            4471.52            11110            11110
1000.00   27/09/2022            4472.95          10920.1          10920.1
1200.00   15/04/2023             4473.7          10764.3          10764.3
1400.00   01/11/2023            4474.59          10637.2          10637.2
1600.00   19/05/2024            4475.52          10539.8          10539.8
1800.00   05/12/2024            4476.48          10457.3          10457.3
2000.00   23/06/2025            4477.32          10386.9          10386.9

Please let me know if it is something you are looking for.

Best,
Kai Bao



On Fri, Mar 15, 2019 at 6:36 PM Stephen, Karl D <K.D.Stephen at hw.ac.uk> wrote:
>
> Hi Kai,
> For completeness, I removed the final WCONINJE keyword and the reference to FIELD in the GCONINJE keyword to be more consistent with the SPE9 case. Bw=1 again.
>
> -- Days   dd/mm/yyyy                FPR             FVIR             FVPR
> --------------------------------------------------------------------------
>    0.00   01/01/2020               4500                0               -0
>    1.00   02/01/2020            4495.02            11000          11499.4
>    4.00   05/01/2020            4483.38            11000          11499.3
>   13.00   14/01/2020            4450.86            11000          11499.4
>   40.00   10/02/2020            4353.57            11000          11499.6
>   97.50   07/04/2020            4149.48          11000.1          11499.5
>  148.75   28/05/2020            3965.53          11000.2          11498.8
>  200.00   19/07/2020            3781.38          11000.2            11497
>  298.64   25/10/2020             3432.1          11000.4            11487
>  400.00   04/02/2021            3086.74          11000.5          11468.6
>  500.00   15/05/2021            2766.78          11000.6          11440.7
>  600.00   23/08/2021             2505.6          11000.7          11358.2
>  700.00   01/12/2021            2504.02          10997.4          10997.4
>  800.00   11/03/2022            2518.26          10945.8          10945.8
> 1000.00   27/09/2022            2557.13          10960.5          10960.4
> 1200.00   15/04/2023            2573.25          10810.6          10810.6
> 1400.00   01/11/2023            2574.08          10699.4          10699.4
> 1600.00   19/05/2024            2559.59          10575.9            10576
> 1800.00   05/12/2024            2562.13          10470.6          10470.6
> 2000.00   23/06/2025            2564.31          10385.1          10385.1
> 2200.00   09/01/2026            2566.22          10317.3          10317.3
>
> The result is initially identical with FPR etc. but once water breaks through, there are differences.
>
> If anyone has another case that successfully tests field voidage replacement that would be great.
>
> Karl
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