Cracking reason of oil and gas pipeline

LI Ruifeng; ZHAO Xu; LUAN Hui; GUI Junyou; SONG Enpeng

doi:10.11973/lhjy-wl202212014

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2022 > 58(12): 58-63. > DOI: 10.11973/lhjy-wl202212014

LI Ruifeng, ZHAO Xu, LUAN Hui, GUI Junyou, SONG Enpeng. Cracking reason of oil and gas pipeline[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2022, 58(12): 58-63. DOI: 10.11973/lhjy-wl202212014

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Cracking reason of oil and gas pipeline

1. Material Support Center, Tuha Petroleum Exploration and Development Co., Ltd., Hami 839009, China;
2. Changqing Oilfield Branch No.6 Gas Production Plant, Xi'an 710018, China;
3. Changqing Oilfield Branch No.4 Oil Extraction Plant, Yinchuan 750000, China;
4. CNPC Tubular Goods Research Institute Co., Ltd., Xi'an 710077, China

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Received Date: June 30, 2022

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Abstract

The cracking cause of an oil and gas pipeline were analyzed by means of macroscopic observation, chemical composition analysis, fracture analysis, hydrogen induced cracking test and sulfide stress cracking test. The results show that the pipe cracking had the characteristics of bulging deformation and wall thickness reduction. The fracture showed toughness nests morphology. The cracking mode of the pipeline was overload plastic fracture. The cracking reason was that the pressure of the pipeline suddenly increased, which caused local bulging of the pipeline, resulting in cracking of the pipeline.
- oil and gas pipeline,
- plastic fracture,
- water hammer effect

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