Produced Water

[Muggle]

Hi -

Can someone advise as to the typical chemicals added during the production of produced water? Primarily, are their surfactant residues in the produced water - and if so - is this from additions prior to DAF or oil/water separation filtration or where in the process?
thanks

 

[leytzher]

Muggle, in our operations in oilfields we usually add scale inhibitor (to prevent scale buildup, ie. BaSO4, CaCO3, etc due to water incompatibility), oxygen scavenger and corrosion inhibitor (to protect the tubulars in the well), demulsifier (to help in the water-oil separation), and clarifier (to help to reduce the oil-in-water content in disposal water).
I hope that this information can be useful for you.
Regards
Leytzher

 

[zdas04]

In gas operations you tend to have a bunch less added chemicals than leytzher mentions for oil. Sometimes you see surfactants that were used to help the well deliquification effort and occasionally you see corrosion inhibiters, but scale and salt inhibiters are used much less than in oil fields.

David Simpson, PE
MuleShoe Engineering

http://www.muleshoe-eng.com

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

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[Muggle]

Thanks Mr. Simpson - we've been running trials in Scotland on gas condenstate and got rid of the BTEX, MEG, THC, Aromatic, and Aliphatics - but the COD did not drop as far as I thought it should - they could not advise as to how much of the surfactant was being recaptured - but suspect the remaining COD came from it -

As to Produced water - what is a typical scale inhibitor chemical composition? Running trials for Bp and C/T and though we've only proven THC/Aromatic reduction - now looking at H2S and trying to figure out whatelse may be in the "mix" that is added before we get the water. Any typical chemical addition data would help me get my head around what to expect.

Thanks -
Dave/Aquatic Technologies