Research on Strength Behavior of Casing Thread with Defects in High Pressure Wells

doi:10.11885/j.issn.1674-5086.2018.09.25.01

Abstract

Abstract: There are few studies on the influence of casing defects on the bearing capacity of connecting threads in high pressure gas wells, and the casing safety evaluation cannot be supported by theory and data. Based on the above problems, the typical API 177.8 mm×12.65 mm P110 steel grade round threaded casing is taken as the research object. Based on the elastic mechanics theory and the corrosion casing mechanics model, the casing-cement ring-formation finite element model under different corrosion forms is established, and the casing thread tooth under the casing-formation-cement ring system is analyzed and studied. The stress distribution law of the threaded connection part under the influence of the stress distribution state and the three corrosion defects. The results show that the uniform corrosion has greater influence on casing thread maximum equivalent stress of high pressure wells than on low pressure wells; influence of pitting and groove corrosion defects on casing thread maximum equivalent stress effects were similar; pitting and groove corrosion defects in the bottom casing thread engagement segments exert significant influence. We also acquire the critical corrosion defect depth of casing under different corrosion defects. The research work in this paper provides a theoretical basis for safety assessment of casing threads in high pressure wells.

Key words: high-pressure well, corrosion defects, casing connection thread, carrying capacity, safe assessment

CLC Number:

TE983

ZHU Xiaohua, GUO Yingchun, DONG Liangliang. Research on Strength Behavior of Casing Thread with Defects in High Pressure Wells[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 166-174.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.09.25.01

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