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FE simulation of sealing ability for premium connection based on ISO 13679 CAL IV tests

Yihua Dou (Xi'an Shiyou University, Xi'an, China)
Yufei Li (PetroChina Southwest Oil and Gas Field Company, Chengdu, China)
Yinping Cao (Xi'an Shiyou University, Xi'an, China)
Yang Yu (Xi'an Shiyou University, Xi'an, China)
Jiantao Zhang (PetroChina Southwest Oil and Gas Field Company, Chengdu, China)
Lin Zhang (PetroChina Southwest Oil and Gas Field Company, Chengdu, China)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 2 July 2020

Issue publication date: 3 February 2021

74

Abstract

Purpose

To maintain the well integrity, the strength and sealing ability of premium connection should be in the safe scope. ISO 13679 is widely used for evaluating the ability of tubing and casing connection all over the world. FE is adopted to simulate the ISO 13679 tests.

Design/methodology/approach

Because of the disadvantage of experiment such as long period, high cost and high requirement on the facility, considering the convenience and universality of finite element method, as well as the contacting nonlinearity and material nonlinearity, three-dimensional finite element model of a certain type of premium connection is established with the consideration of helix angle. The loads exerted on the premium connection are the loads in series B test and thermal cycle test of ISO 13679. The distributions of Von Mises stress and contact pressure in various cases were studied.

Findings

The results showed that the bending load has a great influence on the distribution of Von Mises stress and contact pressure for premium connection. The Von Mises stress and contact pressures on the sealing surface are smaller on the tension side and greater on the compression side. With increasing axial compression load, the contact pressures on the tension side are too small, which may lead to sealing failure. The influence of temperature on the performance of premium connection cannot be ignored when choosing or designing premium connections. Both the Von Mises stress and contact pressure decrease slightly during a period of thermal cycle. Although the performance of the premium connection is good in a period of thermal cycle, its performance in a long period should be evaluated. Finite element simulation can effectively simulate the ISO 13679 test procedure and obtain the stress and contact pressure distribution. It can be used as a reference for evaluating the performance of premium connections.

Originality/value

Considering the convenience and universality of finite element method, as well as the contacting nonlinearity and material nonlinearity, three-dimensional finite element model of a certain type of premium connection is established with the consideration of helix angle.

Keywords

Acknowledgements

This research was funded by the China National Petroleum Corporation Major Science and Technology Special Project (grant number 2016E-0608) and the Chinese National Natural Science Foundation (grant number 51674199).

Citation

Dou, Y., Li, Y., Cao, Y., Yu, Y., Zhang, J. and Zhang, L. (2021), "FE simulation of sealing ability for premium connection based on ISO 13679 CAL IV tests", International Journal of Structural Integrity, Vol. 12 No. 1, pp. 138-148. https://doi.org/10.1108/IJSI-11-2019-0125

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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