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Sour service behavior of a 110ksi material was investigated in a range of production environments. Slow strain rate tests were performed at a strain rate of 510-7/s, in sweet as well as in sour production environments. The strain to failure in sweet environments is lower than the in-air values and is substantially lower in the presence of H2S.
Sour service behavior of a 110ksi material was investigated in a range of production environments. Slow strain rate tests were performed at a strain rate of 510-7/s, in sweet as well as in sour production environments. The strain to failure in sweet environments is lower than the in-air values and is substantially lower in the presence of H2S. The strain to failure was related to the diffusible hydrogen concentration measured from hydrogen flux measurements. Fracture toughness tests were performed using rising displacement tests the results indicate that the initiation toughness in the presence of H2S is substantially lower than the in-air values. Fracture toughness is not significantly influenced by the presence of corrosion inhibitor. At elevated temperature, fracture toughness is lower than the in-air values but is higher than the values at room temperature. There appears to be no effect of applied cathodic potential on initiation toughness in the presence of H2S. However in the absence of H2S at the same over potential the initiation toughness is higher. A limited set of fatigue crack growth rate (FCGR) tests indicate that FCGR increases with decreasing frequency and reaches a plateau at low frequencies. The plateau FCGR is about 10 times the in-air value at room temperature and about 5 times the in-air value at 83C. At RT, pH = 3 there was no significant effect of 200ppm inhibitor in the presence of H2S on the FCGR.
Keywords: downloadable, Sour Service, oil production, strain-to-failure, fatigue crack, H2S, growth rate
Fatigue and fracture performance of UNS N07718 (718) and UNS N07716 (625+) in sour environments over a range of temperatures (300 to 400°F) and chloride concentrations (0.15wt% to 25wt% NaCl). Rising displacement fracture toughness test performed in a range of environments.
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A corrosion cracking assessment evaluated a 13Cr-5Ni-2Mo 110 ksi grade martensitic stainless steel as a potential well tubing material for oil and gas production from Gulf of Mexico reservoirs. Also, Stress Corrosion Cracking at low H2S/low temp/high acidity (pH<3.5) was tested by Cyclic Slow Strain Rate.
Multiple leaks occurred with a carbon steel pipe carrying hot condensate water (300F and 140 psi). A root cause analysis was performed, including visual and metallographic examination of two failed samples chemical, analysis of weld metal and base metal and chemical analysis of water samples. Results show that flow accelerated corrosion (FAC) was the responsible mechanism leading to the failures.