Abstract
Abstract The flow regulation valves are devices commonly manufactured in AISI 316 or AISI 410 stainless steels, which are applied for water injection in petroleum exploitation. These valves have shown a significant failure rate in oil fields on shore at Sergipe, Brazil. The aim of the present study is to explain the main damage mechanisms ocurring on these valves. Therefore, a set of experiments was carried out including valves in field monitoring, water characterization, corrosion and erosion tests of the alloys under some different heat treatments. Chemical analysis, metallography and microhardness provided the alloy's characterization. Failure rate of 100% due to generalized corrosion before 60 days in test was perceived for the AISI 410 valves. Otherwise, the AISI 316 valves presented localized corrosion and failure rate of 32% before 142 days in test. Changes in the injection water content and alloy's selection alternatives are the ways to reduce the failure rate of the valves.
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