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51316-7119-Sour Service Performance of EPR - 110ksi Grade Material

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 510-7/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.

 

 

Product Number: 51316-7119-SG
ISBN: 7119 2016 CP
Author: Thodla Ramgopal
Publication Date: 2016
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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 510-7/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 83C. 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

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 510-7/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 83C. 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

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