[Opm] Problem with injecting field voidage replacement
Stephen, Karl D
K.D.Stephen at hw.ac.uk
Mon Mar 18 11:21:41 UTC 2019
Dear Kai,
When I first contacted you I did think that I should have stated the version of the OPM Flow that I was using. It was the 18.04 version. Perhaps I should have upgraded before hand too but I thought maybe if there had been a bug it would be something you could just go "oh yes we fixed that for the latest version". Sorry about that.
I see now that the 18.10 version does not give me the same problems and I replicate your results. Even the case where I inject and produce with RESV works as anticipated. I guess there must have been a bug that has been fixed between the versions.
Yes, Bw is the second item of the PVTW keyword. In case you don't know it, it defines the compressibility, effectively, and the change in volume between reservoir and surface. Voidage replacement is a good production technique if you want to avoid large pressure variations over the life of the field as you can at least keep the average pressure constant by balancing volumes in and volumes out.
Many thanks for your help.
Karl
-----Original Message-----
From: Opm <opm-bounces at opm-project.org> On Behalf Of Bao Kai
Sent: 16 March 2019 20:25
To: opm at opm-project.org
Subject: Re: [Opm] Problem with injecting field voidage replacement
Hi, Karl,
I did not see any convergence problem with Bw to be 0.8, 1.0 and 1.2.
I assume Bw is the second term in the keyword PVTW .
Which version of OPM are you using?
I attached the DATA file I am using and I only adjusted Bw value in PVTW keyword for testing.
I am not that familiar with the purpose of the experiments and I am not sure what kind of effects that Bw can make here.
With Bw to be 0.8,
-- Days dd/mm/yyyy FPR FVIR FVPR
--------------------------------------------------------------------------
1.00 02/01/2020 4498.12 11498.4 11498.4
4.00 05/01/2020 4496.79 11498 11498
13.00 14/01/2020 4495.43 11498.1 11498.1
40.00 10/02/2020 4492.42 11498.3 11498.4
121.00 01/05/2020 4486.32 11495.1 11495.1
200.00 19/07/2020 4482.02 11483.3 11483.4
400.00 04/02/2021 4475.41 11341.2 11341.2
600.00 23/08/2021 4472.53 11043.4 11043.4
800.00 11/03/2022 4470.95 10607.6 10607.6
1000.00 27/09/2022 4473.2 10146.4 10146.4
1200.00 15/04/2023 4474.59 9737.92 9737.92
1400.00 01/11/2023 4476.21 9391.09 9391.09
1600.00 19/05/2024 4477.95 9131.07 9131.07
1800.00 05/12/2024 4478.67 8937.87 8937.87
2000.00 23/06/2025 4480.73 8783.53 8783.53
With Bw to be 1.0
-- 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
With Bw to be 1.2
-- Days dd/mm/yyyy FPR FVIR FVPR
--------------------------------------------------------------------------
1.00 02/01/2020 4498.12 11500.2 11500.2
4.00 05/01/2020 4496.68 11500.2 11500.2
13.00 14/01/2020 4495.32 11500.2 11500.2
40.00 10/02/2020 4491.92 11500.2 11500.2
121.00 01/05/2020 4486.3 11500.7 11500.7
200.00 19/07/2020 4482.14 11502.7 11502.7
400.00 04/02/2021 4475.98 11523.2 11523.2
600.00 23/08/2021 4472.91 11562.6 11562.6
800.00 11/03/2022 4471.84 11618.8 11618.8
1000.00 27/09/2022 4471.89 11682.3 11682.3
1200.00 15/04/2023 4472.22 11740.9 11740.9
1400.00 01/11/2023 4472.34 11784.6 11784.6
1600.00 19/05/2024 4473.02 11818 11818
1800.00 05/12/2024 4473.88 11845.6 11845.6
2000.00 23/06/2025 4474.63 11868.4 11868.4
Please let me know if the results are desired to you.
Best Regards,
Kai Bao
On Sat, Mar 16, 2019 at 9:02 PM Stephen, Karl D <K.D.Stephen at hw.ac.uk> wrote:
>
> 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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