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51318-10919-The Study on Residual Stresses in OCTG and Its Effect on Pipe Sour Cracking (SSC) Performances

Picture for The Study on Residual Stresses in OCTG and Its Effect on Pipe Sour Cracking (SSC) Performances
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X-Ray diffraction shows that - with hot or cold straightening - there is still a significant amount residual stresses existing in OCTG pipe bodies. A formula was proposed to include the effect of residual stress on determining the sour cracking resistance.

Product Number: 51318-10919-SG
Author: Xin Long / Pete W. Moore
Publication Date: 2018
Industry: Oil and Gas Production
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It is well known that residual stresses in a structure can have a detrimental effect on its flaw cracking process. Through a three-dimensional (3D) finite element analysis (FEA) on a six-roll cold straightening process, it was found that seamless oil country tubular goods (OCTG) pipe has a unique residual stresses pattern due to its manufacturing process. An X-Ray diffraction through wall residual stress measurement shows that even with hot straightening, there is still a significant amount residual stresses existing in the pipe body with a similar pattern found in the cold straightened pipe from FEA. The residual stresses were found to have a significant effect on the pipe sour cracking resistance through an internal pressure burst test of a full-size pipe with a pre-existing flaw in sour environment in an American Petroleum Institute (API) study. A formula was proposed to include the effect of residual stress on determining the sour cracking (sulfide stress cracking) resistance on OCTG tubulars.

Keywords: OCTG, tubulars, residual stress, sulfide stress cracking

 

It is well known that residual stresses in a structure can have a detrimental effect on its flaw cracking process. Through a three-dimensional (3D) finite element analysis (FEA) on a six-roll cold straightening process, it was found that seamless oil country tubular goods (OCTG) pipe has a unique residual stresses pattern due to its manufacturing process. An X-Ray diffraction through wall residual stress measurement shows that even with hot straightening, there is still a significant amount residual stresses existing in the pipe body with a similar pattern found in the cold straightened pipe from FEA. The residual stresses were found to have a significant effect on the pipe sour cracking resistance through an internal pressure burst test of a full-size pipe with a pre-existing flaw in sour environment in an American Petroleum Institute (API) study. A formula was proposed to include the effect of residual stress on determining the sour cracking (sulfide stress cracking) resistance on OCTG tubulars.

Keywords: OCTG, tubulars, residual stress, sulfide stress cracking

 

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51318-10920-High strength steel SSC evaluation in mild sour environments at ambient and high temperatures

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There is an increasing need to define the operating envelope for materials typically used as oil country tubular goods. This paper reports results of sulfide stress cracking (SSC) tests that were performed in mild sour environment at temperatures below 107°C.
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