51314-4247-Categorization of Crude Oils Based on Their Ability to Inhibit Corrosion and Alter the Steel Wettability

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Product Number: 51314-4247-SG

ISBN: 4247 2014 CP

Author: Sonja Richter

Publication Date: 2014

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Field experience shows that in certain cases crude oils can be beneficial in minimizing corrosion in and of themselves despite relatively high water cut while in other cases corrosion occurs with relatively small water cuts. Little research has been conducted to study what in the crude oil chemistry can explain this phenomenon. Since the crude oil chemistry is very complex and can include tens of thousands of chemical compounds working in synergy it is not straight forward to work it out. In this work fifteen different crude oils were tested for corrosion inhibition and wettability alteration (from water wet to oil wet surface). The corrosion inhibition was measured in 4 stages:precorrosion persistency direct inhibition and persistency. The wettability of the surface is assessed by measuring the water-in-oil contact angle on a crude oil prewet steel surface. The results showed that some crude oils were capable of inhibiting corrosion while others were not and some were able to alter the wettability from water wet to oil wet while others could not. Interestingly not all crude oils that could inhibit corrosion would alter the wettability and vice versa. Four different categories of crude oils were identified with respect to their abilities to inhibit corrosion and alter wettability and mechanisms were suggested to explain this behavior.