A NEW TECHNIQUE FOR THE CONTROL OF TOP OF THE LINE CORROSION: TLCC-PIG

摘要

In wet gas lines, top of line corrosion (TLC) can be controlled by either continuous injection ofrna neutraliser to decrease the impact of organic acids or batch treatment. In some cases the combinationrnof these two techniques would be necessary. Batch treatment is generally done by placing an inhibitorrnslug between two pigs. This operation requires generally shut down of the production duringrnpreparation/launching of the batch. It is then envisaged to use the inhibited liquid at the bottom of thernline to film the top of line surface. In fact TLC takes place in lines with stratified flow regime and thernliquid at the bottom of the line is inhibited by continuous injection of a corrosion inhibitor. Severalrntypes of pigs designed for this purpose have been tested. Finally, a pig which uses the gas behind thernpig to spray the bottom liquid by venturi effect has been designed and successfully tested in a 12" twornphase loop. This paper describes the characteristics of the pig, called TLCC-PIG, and test results.