Galvanic corrosion in oil and gas environments

Book · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:268202

Hara, T; Asahi, H ^[1]; Kaneta, H ^[2]

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1. Nippon Steel Corp., Futtsu, Chiba (Japan). Steel Research Lab.
2. Japan National Oil Corp., Chiba (Japan). Petroleum Engineering Lab.

Galvanic corrosion behavior in sour and sweet well environments for combinations of materials from carbon steels to high nickel alloys was investigated by using electrochemical methods and immersion tests. Basically, the results obtained by electrochemical methods coincided with those by immersion test. The ratio of a corrosion rate of a material is coupled to that of uncoupled defined as galvanic effect index (GEI) was studied with different surface ratios. GEI increased with an increase in the weight loss of the uncoupled specimen and is at most 2.0 in both sweet and sour environments when a surface area ratio of anode site to cathode site was 1:1. GEI increased with increasing surface ratio but almost independent on surface ratio at temperatures more than 100 C. Galvanic corrosion was not as serious as expected from the theory.

• OSTI ID: 268202
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON DIOXIDE
CARBON STEELS
CHEMICAL COMPOSITION
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSIVE EFFECTS
CURRENT DENSITY
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
FIELD PRODUCTION EQUIPMENT
HYDROGEN SULFIDES
MECHANICAL PROPERTIES
NATURAL GAS WELLS
NICKEL-CHROMIUM STEELS
OIL WELLS
POLARIZATION
STEEL-CR13