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05128 Corrosion Resistance and Predicted Fitness for Use of Expandable Pipe Manufactured from Superaustenitic Alloy 27-7MO

Picture for 05128 Corrosion Resistance and Predicted
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Product Number: 51300-05128-SG
ISBN: 05128 2005 CP
Author: Nathan C. Eisinger and Brett C. Puckett, Special Metals Corp.; Greg B. Chitwood, Halliburton Energy
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Although 13Cr steels are typically used for base pipe in conventional sand screens, there has been a movement to develop new CRA's for expandable pipe. The 13Cr martensitic steels have poor resistance to H2S induced SCC and do not have the required ductility to survive the high strains generated in an expandable screen base pipe. Austenitic stainless steels such as 316L (UNS S31603) have been shown to be sufficient for many applications with improved ductility and moderate corrosion resistance, but they have restrictive limits in environments where they can be used. Thus, a need for an alloy that can be expanded, but will maintain corrosion resistance is required. Furthermore, to prevail in this very competitive arena, the material must offer a cost-effective alternative to standard 13Cr and expanded 316L pipe. The basis for this study involves measuring the SCC resistance and predicting the mechanical behavior of higher strength corrosion resistant super-austenitic alloy 27-7MO (UNS S31277). Standard slow strain rate and U-bend tests will be used to explore environments where alloy UNS S31277 offers the most economic solution for sand control products.
Although 13Cr steels are typically used for base pipe in conventional sand screens, there has been a movement to develop new CRA's for expandable pipe. The 13Cr martensitic steels have poor resistance to H2S induced SCC and do not have the required ductility to survive the high strains generated in an expandable screen base pipe. Austenitic stainless steels such as 316L (UNS S31603) have been shown to be sufficient for many applications with improved ductility and moderate corrosion resistance, but they have restrictive limits in environments where they can be used. Thus, a need for an alloy that can be expanded, but will maintain corrosion resistance is required. Furthermore, to prevail in this very competitive arena, the material must offer a cost-effective alternative to standard 13Cr and expanded 316L pipe. The basis for this study involves measuring the SCC resistance and predicting the mechanical behavior of higher strength corrosion resistant super-austenitic alloy 27-7MO (UNS S31277). Standard slow strain rate and U-bend tests will be used to explore environments where alloy UNS S31277 offers the most economic solution for sand control products.
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