Annular Fracture Reason of Super 13Cr Oil Tubing Used in High Pressure and High Temperature Gas Well

GENG Hailong; LONG Yan; ZHAO Mifeng; FU Anqing; ZHANG Xuesong; WANG Peng; XU Penghai

doi:10.11973/fsyfh-202202013

Corrosion & Protection > 2022 > 43(2): 68-73. > DOI: 10.11973/fsyfh-202202013

GENG Hailong, LONG Yan, ZHAO Mifeng, FU Anqing, ZHANG Xuesong, WANG Peng, XU Penghai. Annular Fracture Reason of Super 13Cr Oil Tubing Used in High Pressure and High Temperature Gas Well[J]. Corrosion & Protection, 2022, 43(2): 68-73. DOI: 10.11973/fsyfh-202202013

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Annular Fracture Reason of Super 13Cr Oil Tubing Used in High Pressure and High Temperature Gas Well

1. Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company, Korla 841000, China;
2. CNPC Tubular Goods Research Institute, Xi'an 710077, China

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Received Date: June 20, 2020

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Abstract

The aging reasons for annulus fracture failure of super 13Cr tubing used in a high temperature and high pressure gas wells were analyzed by means of chemical composition analysis, mechanical performance analysis and microstructure observation. The results showed that there were a large number of dendritic cracks on the outer surface of the failed tubing, and the surface had a multi-layer corrosion product structure. The fracture belonged to stress corrosion cracking. Phosphate annulus protection fluid contaminated by drilling fluid was the main environmental factor leading to failure. The leakage of annulus protection fluid led to the formation of high casing pressure difference and thus caused high hoop tensile stress on the outer surface of the tubing, which was the main force factor leading to failure.
- HPHT gas well,
- super 13Cr oil tubing,
- stress corrosion cracking,
- annular protection fluid

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