11345 Testing Equipment and Procedures Suitable to Evaluate Deepwater Scale and Corrosion Inhibitors

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Product Number: 51300-11345-SG

ISBN: 2011 11345 CP

Author: Hua Guan and Alyn Jenkins

Publication Date: 2011

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In this paper, several scale inhibitors and combination scale inhibitor/corrosion inhibitors were developed to meet the requirement for deepwater applications. Following extended stability and compatibility testing, the inhibitors were exposed to the high-pressure flow loop with cyclic temperature variation from seabed temperature to 100°C over a period of 24 hours. The performance of each inhibitor was evaluated after the flow loop exposure. Rheology profiles at both ambient and highpressure conditions were measured to study the effect of shear rates experienced in deepwater fields. It was found that some products showed poorer performance after going through the flow loop while others maintained similar performance in comparison to the standard samples. The mechanism of this performance difference is discussed in the paper. Based on the full-suite laboratory evaluation, including hydrate inhibition and environmental evaluations, one of the products was selected to be used in a deepwater field.

This paper aims to highlight the importance of suitable laboratory equipment and testing procedures to evaluate the inhibitors for deepwater applications. The wide range of temperature variations, high shear, long residence time and high-temperature, high-pressure (HTHP) environment for the deepwater fields has been successfully simulated in the laboratory.

Key words: Deepwater, Scale Inhibitor, Combined Scale Inhibitor and Corrosion Inhibitor, Umbilical Blockage, Stability, Compatibility, Inhibition Performance, Degradation