Evaluation of the Surface on CRA after the Actual Exposure in Sour Gas Well

ABSTRACT Corrosion resistant alloys (CRAs) have been used in exploration and production fields which contain high pressure, high temperature and significant amounts of hydrogen sulfide, carbon dioxide and chloride ions. Corrosion resistant alloys (CRAs) are standard for exploration and production fi...

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Bibliographic Details
Published inNACE International Corrosion Conference Proceedings pp. 1 - 13
Main Authors Sagara, Masayuki, Ueyama, Masaki, Amaya, Hisashi, Suzuki, Yuhei, Doi, Takashi
Format Conference Proceeding
LanguageEnglish
Published Houston NACE International 01.01.2019
Subjects
Alloys
Carbon dioxide
Charpy impact test
Chloride ions
Chloride resistance
Chromium
Corrosion products
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Gas wells
High temperature
Hydrogen
Hydrogen sulfide
Impact strength
Intermetallic compounds
Investigations
Laboratories
Mechanical properties
Microstructure
Molybdenum
Oil field equipment
Sour gas
Tensile tests
Tubular goods
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Summary:ABSTRACT Corrosion resistant alloys (CRAs) have been used in exploration and production fields which contain high pressure, high temperature and significant amounts of hydrogen sulfide, carbon dioxide and chloride ions. Corrosion resistant alloys (CRAs) are standard for exploration and production fields which contain high pressure, high temperature and significant amounts of hydrogen sulfide, carbon dioxide and chloride ion.1,2,3 The characteristic corrosion resistance and mechanical strength of material of CRAs are required for oil country tubular goods (OCTG) for HPHT wells.4,5,6 These alloys contain high levels of chromium, nickel and molybdenum; therefore a passive film can be formed on the surface in such harsh environments. EXPERIMENTAL PROCEDURE Materials Detailed investigation for field-experienced UNS N08535 was carried out covering mechanical properties, microstructure, induced corrosion damage and passive surface film. Elevated temperature tensile tests were conducted in accordance to ASTM E21-09 at 50, 100, 150 and 200 °C. To evaluate toughness of unused and field-experienced pipe, Charpy impact tests were also performed.