Flow-Induced Corrosion and Erosion-Corrosion Assessment of Carbon Steel Pipework in Oil and Gas Production

摘要

A flow-induced corrosion and erosion-corrosion investigation was conducted to determine thedegradation rates and mechanisms that had been experienced in service in the pipework of an offshorefacility. The investigation reviewed the flow-induced corrosion and erosion-corrosion performance of thecarbon steel parent metal of the pipework in comparison to the heat affected zone (HAZ) and thenickel-molybdenum weld material. The programme of experiments assessed the potential of twocorrosion inhibitors to adequately control the material degradation caused by static corrosion, flowinducedcorrosion and erosion-corrosion on the three regions. Static corrosion tests were performedusing linear polarisation in CO_2 saturated conditions. Flow-induced corrosion and erosion-corrosionexperiments were conducted utilising a submerged impinging jet (SIJ) in CO_2 saturated conditions at afluid velocity of 7m/s with sand loadings of 0mg/L and 100mg/L. The effects of flow-induced corrosionand erosion-corrosion were studied using gravimetric techniques. Mechanisms were discussed basedupon results obtained from micro-structural studies.