Oil well location

[06pg22]

THP: Tubing head pressure APPROX = WHP
BHP: Bottom hole pressure, also denoted as Pwf or Pws

According to Darcy Law lesser the BHP more will be the drawdown and more will be recovery, similar applies to THP
But if THP is descreasing and BHP is increasing it indicates liquid load up in your well.

ECLIPSE need VFP tables if you want to use THP as control mode for production in WCONPROD
Otherwise rely on BHP as a control mode.

[sammy12345]

Hi,
Thank you
Azeem

[sammy12345]

Hi Bilal,
I also noticed that by decreasing BHP, the FGPR (Field gas production rate shoots up), but the Field oil production rate remains the same, but when I reduce THP with BHP as well, the oil production slightly increases, there is not that much difference.
Azeem

[sammy12345]

Hi Bilal,

your help is really appreciated as I did achieve maximum oil recovery by adjusting the BHP and THP for the (WCONPROD) and (WCONINJE).
I wanted to ask you something which I found from my results. By increasing the BHP to a higher value, I got an increase in field pressure for the reservoir and the gas oil ratio remained stable, the GOR didnot changed that much, but the field oil production total dropped by 200,000 STB from the origional value, can you please tell me the theory behind this, because I thought that due to increase in field pressure the oil production should have increased, as the GOR was stable, for this simulation, I only played with the BHP, I didnot changed the THP values. I changed the BHP to 2400 from 2000. As BHP 2000 gave the maximum oil production, but changing the BHP for (WCONPROD) reduced the oil production.
I only want to know the theory behind this so that I can understand what is happening.

regards
Azeem

[06pg22]

My pleasure Azeem,

Decreasing your BHP means you are decreasing drawdown and thus production. It will show you increase in reservoir pressure as well.
BHP must be as minimum as possible keeping in view liquid lift and bubble point pressure as limiting constraints.

You said, GOR remain stable as you limit BHP to some lower value. It shows that within reservoir, Pb is not achieved and gas you produced is purely solution gas. It shows that there is no gas saturation in your reservoir as well.

[sammy12345]

Thanks Bilal,
Just want to share my result, the default values were:

WCONPROD
BHP: 2000 Psia each (for production wells U, L, U1, U2 and LU1)
THP: 200 psia each (for production wells U, L, U1, U2 and LU1)

WCONINJE
THP: 2000 Psia (for injection well control "I")

I got maximum oil recovery by changing the above values to these values mentioned below:
WCONPROD
BHP: 2000 Psia each (for production wells U, L, U1, U2 and LU1)
THP: 100 psia each (for production wells U, L, U1, U2 and LU1)

WCONINJE
THP: 1200 Psia (for injection well control "I")

So according to the results mentioned above it does seems that THP has been a controlling factor for my reservoir and by changing the BHP, I did not achieve any additional oil recovery. I did changed the BHP for the WCONPROD to 500 Psia, but I got the same result for the field oil production total.
I would be highly obliged if you can just let me know, the theory behind all of this, or what should I actually put in my concluding statement/result, as I performed the sensitivity analysis for BHP/THP

regards
Azeem

[06pg22]

Decreasing THP you have increased the lift (drawdown) of the well; flow rates would have increased as well.
Let me confirm, are you using the BRILLIG.DATA for your project?

[sammy12345]

Hi Bilal,

Yes I am using Brilling.data

Azeem.

[sammy12345]

Hi Bilal,

I used the same brilling.data and changed the position of production wells in order to get maximum oil recovery as this is the aim of my thesis, after that the use the above mentioned sensitivity analysis to obtain additional oil recovery, since my project is only an undergraduate thesis and I am totally new to all of this, I also want my thesis to be a bit simple.
I would be highly obliged if you can give me a few feed back, concluding words for the above mentioned sensitivity analysis I have done, so that I can understand the exact meaning of what has actually happened, when I finally understand the true meaning of my results, I can surely write my own conclusion

regards
Azeem

[06pg22]

I am in doubt to remind that this model also has gas lifted oil wells... Are you considering them as well?

[sammy12345]

Hi Bilal,
yes I understand, there are 10 oil production wells, one gas injection well and 08 water injection wells, my aim was only to adjust the oil production wells to get max oil recovery.
waiting in anticipation for your understanding on my results on my sensitivity analysis of BHP and THP
regards

[06pg22]

I mean Artificial Lift Wells.