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rguill5, I believe that you've got the barium and sulphate mixed up as to where they derive. I have extensive North Sea experince with formation water barium (up to 5000 ppm) and seawater injection for pressure support, which is why we lost early wells that were produced and why the company that...

Malancha, You are correct about it occuring at certain localized zones in a pipeline during blowdown. This is especially true of long subsea tiebacks and how the blowdown is controlled (1 inch versus a 2 inch choke). What happens is that as the fluids go 2 phase you can get a localized JT effect...

Erik, Your statement is not completely true as this phenomena has many faces. Unfortunately for me I had the pleasure of working on West Brae in the North Sea which has severe Calcium Naphthenate emulsion problems. What occurs is that with high TAN (Total Acid Number) crudes and produced water...

JT effects in "typical" gas pipelines is negligable compared to the mass heat transfer to the surroundings especially with connate water (saturated gas) or included formation water production. The only real places you will see this effect is where you take a decent pressure drop in the...