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Selecting Stabilization Method In Oil Production Process

oil stabilization multiflash stabilizer column

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#1 Wondor

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Posted 02 September 2015 - 02:19 AM

I'm studying offshore oil production processes(FPSOs, Fixed platforms..).

 

I've seen some projects chose "Muliflash separation" as their oil stabilization method.

However, one project chose stabilizer column as its oil stabilization method, even though it was FPSO project.

 

I want to know what is the design criteria of selecting oil separation & stabilization method.

I guess there are some kind of influential parameter, such as gas-oil-ratio (GOR)...

 

 

 

 

 



#2 PingPong

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Posted 02 September 2015 - 07:12 AM

A stabilizer will give a much sharper separation between gas and oil (gas will contain less heavies and oil will contain less lights) than just some flashes.

 

Without further knowledge of the specific projects I would assume that the product specs put on the gas and/or the oil determined the choice.



#3 Wondor

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Posted 02 September 2015 - 06:04 PM

The RVP specs were the same among the projects as 10 psi.
 
I want to show you some differences in BOD, as shown below table
 
- Project A chose Stabilizer column as oil stabilization method.
- Project B chose multiflash separators as oil stabilization method.
 
I can see Project A has much lighter oil, and more gas production.
So i guess ProjectA chose Stabilizer column.
 
Is there any specific criteria about choosing stabilization method?

Attached Files


Edited by Wondor, 02 September 2015 - 06:08 PM.


#4 PingPong

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Posted 03 September 2015 - 04:12 AM

RVP says nothing about the sharpness of the separation between gas and oil.

One can in theory produce an oil with an RVP of 10 psi by using a single flash, or 2 flashes, or 5 , or 10 , or 100, or using a column with 10 trays, or 20 , or 50 , or 100.

Although all designs can produce the same oil RVP, they do not produce the same oil composition.

 

One would need to see the flow diagram and material balance of project A to understand what the design objective was.

 

http://www.ogj.com/a...plications.html


Edited by PingPong, 03 September 2015 - 04:18 AM.


#5 walidd_23

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Posted 03 September 2015 - 07:36 AM

Wondor,
 
Generally we use stabilizer column when the oil contain high % of H2S,
 
Multiflash method is not able to meet H2S% specification (10 ppm), only if we heat the oil in a very high temperature where it is not economical and risc to crack the oil.
 
 
so the first choice is always multiflash method only if we prove that stabilizer column gives better performance more economical
 
Walid,

Edited by walidd_23, 03 September 2015 - 07:46 AM.


#6 Wondor

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Posted 09 September 2015 - 07:00 PM

Thanks for replying, PingPong and walidd_23.

 

To refer your advices and other references,

I am making a simple flow chart of desiging 'Oil processing system'.

Dehydration/Desalting is not considered in the flow chart yet.

Please take a look at it and give me some comments.

Attached Files


Edited by Wondor, 09 September 2015 - 07:08 PM.


#7 PingPong

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Posted 15 September 2015 - 10:21 AM   Best Answer

Were you able to read the OGJ article with decision tree that I posted? I now notice that the link does not give the article when clicked in this forum, but when tiping the article title into google one can easily read it. Anyway, I copied the text into a document:

 

Attached File  Offshore Topsides OGJ 24feb1997.doc   64.5KB   62 downloads

 

I have no experience designing this kind of systems, but it seems unlikely to me that risk of cracking crude oil would be a criteria in the decision tree. I can't imagine that the preheat temperature in this kind of systems would ever reach 350 oC.

 

Economics however also play a role in every design decision.

 

And then there is of course also the experience/prejudice/....... of the design engineer or the client.


Edited by PingPong, 15 September 2015 - 10:21 AM.


#8 Propacket

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Posted 20 September 2015 - 12:42 PM

Another factor that is important in selecting between the two processs is Oil Production. With trays you will be able to get more producion for same amount of inlet fluid. I believe every chemical engineer knows why the trays give more production.

#9 Zauberberg

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Posted 21 September 2015 - 02:08 AM

In addition to the replies above, see attached materials.

Attached Files



#10 Wondor

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Posted 04 October 2015 - 06:17 PM

@ Pingpong 

Wow...That's exactly what i was looking for. I'm really appericiated for your kindness. Thanks.

 

 

@ Zauberberg 

Thanks. I will read them too. Thanks a lot.






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