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51313-02639-Sour Service Limits of Martensitic SS: Review of Current Knowledge Test Methods and Development

Picture for Sour Service Limits of Martensitic SS: Review of Current Knowledge Test Methods and Development
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Product Number: 51313-02639-SG
ISBN: 02639 2013 CP
Author: Nacéra Sabrina Meck
Publication Date: 2013
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Modern high-strength martensitic stainless steel (MSS) oil country tubular goods (OCTG) including modified 13Cr (95 110 and 115 ksi grade) and 15Cr (125 ksi grade) grades are frequently considered as possible replacements to conventional 13Cr steel and duplex stainless steel tubulars for the completion of high-temperature high-pressure (HTHP) wells. These alloys have demonstrated corrosion resistance in HTHP well conditions but are susceptible to environmentally assisted cracking (EAC) due to the interplay of depassivation due to chlorides and hydrogen uptake due to the presence of hydrogen sulfide. General caution and the need to perform extensive qualification tests on these alloys have historically limited their service in sour oil and gas production.
Even though there is significant test data and published papers on modified 13Cr grades of MSS OCTG particularly on 13Cr-5Ni-2Mo materials major questions remain and there is little agreement among users and producers of these materials from testing methods to serviceability limits for sour service. Some of these issues include the use of acetate buffers determination of in-situ solution pH and H2S charging role of possible oxygen contaminants and the nature of localized corrosion and EAC in sweet and sour conditions. To date these issues and the lack of a coherent data set for sour service limits have resulted in the absence of modified 13Cr MSS from NACE MR0175 / ISO 15156 sour service document. This paper will review and summarize the literature highlighting discrepancies in test approaches and results and discuss a path forward for the inclusion of MSS as a group of materials for inclusion in NACE MR0175 / ISO15156 and general acceptance of sour service limits.
 

Modern high-strength martensitic stainless steel (MSS) oil country tubular goods (OCTG) including modified 13Cr (95 110 and 115 ksi grade) and 15Cr (125 ksi grade) grades are frequently considered as possible replacements to conventional 13Cr steel and duplex stainless steel tubulars for the completion of high-temperature high-pressure (HTHP) wells. These alloys have demonstrated corrosion resistance in HTHP well conditions but are susceptible to environmentally assisted cracking (EAC) due to the interplay of depassivation due to chlorides and hydrogen uptake due to the presence of hydrogen sulfide. General caution and the need to perform extensive qualification tests on these alloys have historically limited their service in sour oil and gas production.
Even though there is significant test data and published papers on modified 13Cr grades of MSS OCTG particularly on 13Cr-5Ni-2Mo materials major questions remain and there is little agreement among users and producers of these materials from testing methods to serviceability limits for sour service. Some of these issues include the use of acetate buffers determination of in-situ solution pH and H2S charging role of possible oxygen contaminants and the nature of localized corrosion and EAC in sweet and sour conditions. To date these issues and the lack of a coherent data set for sour service limits have resulted in the absence of modified 13Cr MSS from NACE MR0175 / ISO 15156 sour service document. This paper will review and summarize the literature highlighting discrepancies in test approaches and results and discuss a path forward for the inclusion of MSS as a group of materials for inclusion in NACE MR0175 / ISO15156 and general acceptance of sour service limits.
 

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51315-5422-Determining Reliable Domain for 13CR Martensitic Stainless Steel Downhole Tubular in Sour Environment and Revisiting NACE MR-0175/ISO 15156 Limits

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Picture for Sulfide Stress Cracking (SSC) Resistance of AISI 420 Modified (13Cr) Martensitic Stainless Steel Bar
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51317--9645-Sulfide Stress Cracking (SSC) Resistance of AISI 420 Modified (13Cr) Martensitic Stainless Steel Bar

Product Number: 51317--9645-SG
ISBN: 9645 2017 CP
Author: Karthik Krishnan
Publication Date: 2017
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This paper discusses a study wherein the SSC resistance of 13Cr bar stock quenched and tempered to 22 HRC maximum hardness was tested and evaluated beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service.

 
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