BS&W calculation

[ColourfulFigsnDiags]

Hi all,

am developing a fairly complicated well clean up model and am trying to figure out how long it will take for the BS&W at topsides to be acceptable.

Now no one I have spoken to has been able to give me a direct answer of exactly how BS&W is calculated ... they generally say "Oh we take a sample, chuck it in a machine and it tells us" ... that doesnt really help me.

How is the BS&W calculared. Is it simple a volume ratio i.e. vol of Sediment and water vs. vol of HC fluids? or what?

Cheers

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[jmw]

I think there is an Esso patented method out there somewhere which might give an explanation (this is for flowing crude and uses density measurements).

This is a link to a dictionary that desctibes what it is and how it is measured:

http://books.google.co.uk/books?id=...&hl=en&sa=X&oi=book_result&resnum=1&ct=result

But I'm not sure how that may help.


JMW

http://www.ViscoAnalyser.com

 

[jmw]

PS Maybe these guys at Thermo can tell you:

http://www.thermo.com/eThermo/CMA/PDFs/Product/productPDF_3983.pdf

(Google was useles, this link appeared on the first search page of

http://www.alltheweb.com

search, second choice search engine; is it just me or does the "search within results" on gooigle seem to open up rather than drill down?))

JMW

http://www.ViscoAnalyser.com

 

[ColourfulFigsnDiags]

Thank you JMW! I think that first link has answered my question ...

"It is measured by volume on a centrifuged sample of the oil ..."

Therefore I guess that a BS&W of 5% in a 100ml sample would indicate that there is 5ml of water and sand and 95ml of hydrocarbon ...

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[Unotec]

We do that on a daily basis, about 100 times a day. All we use is a sample spinner/centrifuge. Yes, it is a simple volume ratio. In our case the concerns are the thickness of the interphase emulsion between the oil and water (receipts) and the straight BS&W for pipelining the oil (product)

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>

 

[ColourfulFigsnDiags]

Do you do that sampling up or downstream of the 1st stage sep?

BTW Thanks for the confirmation about the calc.

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[Unotec]

We sample on the 'waste' received (straight off the truck) and samples off the shipping tank prior to pipelining it.

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>

 

[ColourfulFigsnDiags]

Ahhh here I am talking about sampling on an FPSO, but didnt state the context Thanks anyway!

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