Study on residual strength of casing threaded joint considering wear

Hongtao Liu; Hailong Geng; Wei Fan; Mifeng Zhao; Junfeng Xie; Biao Shen

doi:10.1117/12.2652506

10 November 2022 Study on residual strength of casing threaded joint considering wear

Hongtao Liu, Hailong Geng, Wei Fan, Mifeng Zhao, Junfeng Xie, Biao Shen

Proceedings Volume 12331, International Conference on Mechanisms and Robotics (ICMAR 2022); 123313Z (2022) https://doi.org/10.1117/12.2652506
Event: International Conference on Mechanisms and Robotics (ICMAR 2022), 2022, Zhuhai, China

Abstract

Casing threaded joint wear is one of the main reasons that affect the sealing integrity and structural integrity of casing string. Due to the complex structural characteristics of casing threaded joint, there are few studies on mechanical properties of casing threaded joint under wear conditions. In this paper, to simulate the residual strength of casing threaded joint considering wear, a finite element model of BTC casing thread is established. The stress distribution of worn casing threaded joint is analysed under the effect of inner pressure, outer pressure and axial tension. The results indicate that under the effect of inner pressure and outer pressure, the maximum and average Mises stress increases with the increase of casing wear depth; under the effect of axial tension, with the increase of wear depth, the maximum Mises stress has a little change, but the average Mises stress increases significantly. Based on the stress analysis of thread under different wear depths, the decrease rate of bearing capacity of BTC thread is measured by the increase proportion of average stress after wear. Thread residual strength gets lower with the increase of wear depth, when wear depth reaches 4 mm, burst strength, collapse strength and tensile strength decrease by 14.7%, 25.9% and 20.7% respectively. Through the methods and results presented in this paper, the residual strength of casing threaded joint can be quantized, which can provide a theoretical foundation and technical basis for casing residual strength evaluation and casing strength check.

Citation Download Citation

Hongtao Liu, Hailong Geng, Wei Fan, Mifeng Zhao, Junfeng Xie, and Biao Shen "Study on residual strength of casing threaded joint considering wear", Proc. SPIE 12331, International Conference on Mechanisms and Robotics (ICMAR 2022), 123313Z (10 November 2022); https://doi.org/10.1117/12.2652506

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KEYWORDS

Finite element methods

Teeth

Failure analysis

Safety

Fluctuations and noise

Metals

Product safety

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