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10307 Sulfide Stress Cracking (SSC) Resistance Limits for a 125KSI Grade High Strength Low Alloy Steel OCTG Developed for Mildly Sour Service

Picture for 10307 Sulfide Stress Cracking Resistance Limit for a 125KSI Grade High Strength Low Alloy Steel OCTG
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Product Number: 51300-10307-SG
ISBN: 10307 2010 CP
Author: Tomohiko Omura, Taro Ohe, Toshiharu Abe, Masakatsu Ueda, Perry Ian Nice and John W. Martin
Publication Date: 2010
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A 125 ksi grade high strength low alloy steel OCTG has been developed for mildly sour environments. This has been used for a “Fit For Purpose” production casing material in high pressure / high temperature wells.

In this paper, the prevention of oxygen ingress and pH stabilization during testing have been investigated for obtaining accurate SSC test results by NACE TM0177-2005 Method A in mildly sour conditions. Testing techniques have been developed in which the test equipment is contained within a nitrogen chamber and the test pH is stabilized by using an acetic acid / sodium acetate buffering system.

The SSC resistance of 125 ksi grade high strength low alloy steel has been evaluated using the above mentioned testing techniques under various H2S partial pressure and pH conditions. The SSC resistance limits are discussed in the relationship between H2S partial pressure and pH.

Keywords: sulfide stress cracking, low alloy steel OCTG, hydrogen sulfide, hydrogen
A 125 ksi grade high strength low alloy steel OCTG has been developed for mildly sour environments. This has been used for a “Fit For Purpose” production casing material in high pressure / high temperature wells.

In this paper, the prevention of oxygen ingress and pH stabilization during testing have been investigated for obtaining accurate SSC test results by NACE TM0177-2005 Method A in mildly sour conditions. Testing techniques have been developed in which the test equipment is contained within a nitrogen chamber and the test pH is stabilized by using an acetic acid / sodium acetate buffering system.

The SSC resistance of 125 ksi grade high strength low alloy steel has been evaluated using the above mentioned testing techniques under various H2S partial pressure and pH conditions. The SSC resistance limits are discussed in the relationship between H2S partial pressure and pH.

Keywords: sulfide stress cracking, low alloy steel OCTG, hydrogen sulfide, hydrogen
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