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[Vis]

I am looking at a system with natural gas coming into an offshore platform at high pressure >1000 psig. There are no condensates / liquid hydrocarbons. The produced water is to be sent to a closed drain and I expect it to have small amounts of dissolved gas. How is this produced water to be treated before being discharged offboard ( typical oil skimmers etc might not be required as there is no oil coming into the platform). How is the gas disposed ?

Can any one show a typical sketch for this system (ie produced water treatment when there is no oil but only dissolved gases).

[ankur2061]

Dissolved hydrocarbon gases or worse dissolved H2S in produced water needs to be handled very carefully and you require seal-pots or U-shaped siphons to prevent their migration and accumulation on the offshore decks.

I had prepared a standard on "Drain Systems" for an offshore O&G company in the middle-east which also had a lot of illustrations related to off-shore platform drain systems. I am attaching a sketch related to seal-pot and a U-shaped siphon.

Hope this helps.

Regards,
Ankur

Attached Files

•  Offshore_Drain_Collection_Options.doc   58KB   249 downloads

Edited by ankur2061, 03 October 2011 - 10:23 AM.