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Chlorides In Production Separator Gas Stream

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#1 benoyjohn


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Posted 16 July 2007 - 05:17 AM


We had to estimate the carry over of chloride salts with the oil and gas production separator gas for a production facility. I understand that the Chlorides accelerate the corrosion process and hence their concentration govern the mettalurgy of the downstream systems. We have a downstream compression system for which we have to decide the mettalurgy. The concentration of H2S in the gas phase is about 1.5% and CO2 about 5%.

We have the concentartion of the salts in the produced water as an input. This is approximately 7000 ppm chloride salts.

The seperator operates at 1.5 barg and 50 deg C.

I would like to know the approach to be followed in the study.

Is it correct to assume that there will be no chloride salt carry over into vapour phase (in ppm levels) other than physical carryover through water droplets which could not be seperated in the seperator?

Or has the system to be simulated by a process simulator to determine carryover levels of the chloride salt component


#2 indy


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Posted 24 July 2007 - 09:43 AM

If I were you I would make a simulation study.For your downstream system equipment metalurgy choice it is important to know; H2S, CO2 and chlorides content .

good luck



#3 JoeWong


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Posted 25 July 2007 - 10:33 AM

Concentration of H2S in the gas phase is about 1.5% and CO2 about 5%...

I guess...material shall be NACE MR0175 / ISO-15156 compliant as the partial pressure is more than 0.05 psia (in addition to low pH). 5% CO2 with wet gas probably caused acid corrosion and CRA material probably a good choice to go with. You may confirm my statement with DeWaard-Milliam curve.

No scrubber will give perfect separation. Thus, certain amount of liquid will probably carry over. Hence Ion Chloride in liquid droplet will probably get into your system. However, as no oxygen present in the feed stream and low Chloride, thus internal CSCC may not an issue eventhough the compressor discharge see high temperature.

Hope this help.


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