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11114 Hyperduplex Stainless Steel, UNS S33207, for Raw Seawater Injection

Picture for 11114 Hyperduplex Stainless Steel, UNS S33207, for Raw Seawater Injection
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Product Number: 51300-11114-SG
ISBN: 11114 2011 CP
Author: Ulf H. Kivisäkk and Mikael Herrdin
Publication Date: 2011
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$20.00
$20.00
Raw seawater injection is an increasingly used technology in oil production. The injection of water allows more oil to be retrieved from a well. A large advantage of using raw seawater compared to treated seawater is that no surveillance is needed, and hence, the manning can be reduced. However, raw seawater requires the use of more corrosion resistant alloys than treated seawater. UNS S33207 is a newly developed hyperduplex stainless steel for umbilicals. It has a minimum PREN of 50. Recently, large diameter tubing has been developed with minimum yield strength of 101 ksi in the solution annealed condition, which results in a high strength material with a low level of anisotropy for the mechanical properties. The crevice corrosion resistance was evaluated by laboratory testing. In addition, crevice corrosion testing of UNS S33207 in natural seawater with severe crevices was performed, demonstrating very good crevice corrosion resistance. Furthermore, no indications of stress corrosion cracking in SSRT-testing in synthetic seawater at 80°C were found. The mechanical properties of the large diameter tubing and the results from the corrosion testing show that UNS S33207 is a good candidate tubing material for raw seawater injection.

Key words: Hyperduplex, Raw seawater injection, Crevice corrosion, Stress corrosion cracking, Tubing
Raw seawater injection is an increasingly used technology in oil production. The injection of water allows more oil to be retrieved from a well. A large advantage of using raw seawater compared to treated seawater is that no surveillance is needed, and hence, the manning can be reduced. However, raw seawater requires the use of more corrosion resistant alloys than treated seawater. UNS S33207 is a newly developed hyperduplex stainless steel for umbilicals. It has a minimum PREN of 50. Recently, large diameter tubing has been developed with minimum yield strength of 101 ksi in the solution annealed condition, which results in a high strength material with a low level of anisotropy for the mechanical properties. The crevice corrosion resistance was evaluated by laboratory testing. In addition, crevice corrosion testing of UNS S33207 in natural seawater with severe crevices was performed, demonstrating very good crevice corrosion resistance. Furthermore, no indications of stress corrosion cracking in SSRT-testing in synthetic seawater at 80°C were found. The mechanical properties of the large diameter tubing and the results from the corrosion testing show that UNS S33207 is a good candidate tubing material for raw seawater injection.

Key words: Hyperduplex, Raw seawater injection, Crevice corrosion, Stress corrosion cracking, Tubing
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Superduplex stainless steels have been used in seawater systems since 1986 as castings and since 1990 as wrought product. The present paper describes some of the service environments commonly in use and the conditions that give rise to specific operating potentials. The limits of use under these conditions are described utilizing both laboratory and service experience.
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Product Number: 51317--9608-SG
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In seawater handling systems, better dissolved oxygen controls would permit the use of more cost effective materials such as duplex stainless steel UNS S82551. Corrosion testing of tubes joined together with a proprietary premium threaded connection was performed in controlled seawater loops simulating service conditions at 30°C.

 
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