10096 Field Testing of Volatile Corrosion Inhibitors and Evaluation of Batch Treatment Efficiency by Cooled Probe

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Product Number: 51300-10096-SG

ISBN: 10096 2010 CP

Author: Suchada Punpruk, Yves Gunaltun and Matina Thammachart

Publication Date: 2010

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A 16 inches (0.4 metres) wet gas line on one of the wellhead platforms of “field A” was modified to install a cooled probe at the 12 o’clock position to evaluate the efficiency of two volatile corrosion inhibitors which have been shown to provide acceptable levels of protection in laboratory testing. A corrosion inhibitor was injected at the Christmas tree level and the corrosion rate was measured, using a cooled probe downstream of the manifold. This particular facility also includes a chemical injection point at the 6 o’clock position under the cooled probe to send the corrosion inhibitor to the probe surface in order to simulate corrosion inhibitor batching by spray pig. This monitoring system was used to evaluate the efficiency of both volatile inhibitor and the bottom line corrosion inhibitor currently used for batch treatment. The paper additionally describes the field testing set-up, summarizes tests results and discusses the acceptability of corrosion controls through the use of batch treatments and volatile corrosion inhibitors. Field test results have shown the possibility of effective Top of the Line Corrosion (TLC) control by volatile inhibitors and confirm appropriate batching period as was determined through laboratory testing results.

Key Words: Top of line corrosion, Volatile corrosion inhibitor, Batch treatment inhibitor, Cooled probe