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11100 Environmentally Assisted Cracking Testing of High Strength 15Cr Steel in Sour Well Environments

Product Number: 51300-11100-SG
ISBN: 11100 2011 CP
Author: John Meng, Brian Chambers, Russell D. Kane, Jim Skogsberg, Mitsuo Kimura and Ken Shimamoto
Publication Date: 2011
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$20.00
$20.00
As a new corrosion resistant alloy (CRA), high strength 15Cr martensitic stainless steel (0.03C- 15Cr-6Ni-2Mo-1Cu) offers an OCTG material for the completion of HTHP deep water wells and large bore gas wells, due to a combination of high specified minimum yield strength (SMYS) of 862 MPa (125 ksi) without cold drawing, good notch toughness, and superior CO2 corrosion resistance. This paper describes the test protocol for development of “project-ready” data of 15Cr steel to determine sour service limits in terms of environmentally assisted cracking (EAC) and presents some EAC test results. In addition, the effect of two different buffers, including the acetic acid/acetate buffer and bicarbonate buffer, on pitting corrosion and EAC has been evaluated and discussed.

Key words: OCTG, martensitic, stainless steel, localized corrosion, environmentally assisted cracking, hydrogen sulfide (H2S), and acetate buffer.
As a new corrosion resistant alloy (CRA), high strength 15Cr martensitic stainless steel (0.03C- 15Cr-6Ni-2Mo-1Cu) offers an OCTG material for the completion of HTHP deep water wells and large bore gas wells, due to a combination of high specified minimum yield strength (SMYS) of 862 MPa (125 ksi) without cold drawing, good notch toughness, and superior CO2 corrosion resistance. This paper describes the test protocol for development of “project-ready” data of 15Cr steel to determine sour service limits in terms of environmentally assisted cracking (EAC) and presents some EAC test results. In addition, the effect of two different buffers, including the acetic acid/acetate buffer and bicarbonate buffer, on pitting corrosion and EAC has been evaluated and discussed.

Key words: OCTG, martensitic, stainless steel, localized corrosion, environmentally assisted cracking, hydrogen sulfide (H2S), and acetate buffer.
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