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Study on safety evaluation and design method of union joint thread for Ultra-high pressure fracturing manifold by Liangliang Dong; Xutao Xie; Xiaohua Zhu; Shiqiang Wang; Sha He is a Engineering article available to read on EtoBox.

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Ultra-high pressure fracturing technology has become more and more important in China's deep Shale Gas extraction. In recent years, fracturing manifold failure accidents have happened frequently and service life has shortened drastically. There are more than 94% of failure accidents that are caused by vibration fatigue of the union joint. In this paper, it was established as a 3d finite element model of the union joint based on finite element theory and fatigue theory. The author proposed a safety evaluation method based on fatigue life, and compared it with that based on strength. The results show that vibration is the key factor affecting fatigue life, and the fatigue life-based safety evaluation method is more suitable to describe the union joint safety. Therefore, set fatigue life as optimization goal and the key parameters of the union joint thread are optimized by orthogonal optimization method. The optimal results are obtained from the study range, namely that the thread turns 8, the pitch is 10.47 mm, the bearing surface angle is 24.5°, and the guide surface angle is 24.5°. In comparison to the initial union joint, the fatigue life of the optimized union joint is increased

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Author

Liangliang Dong; Xutao Xie; Xiaohua Zhu; Shiqiang Wang; Sha He

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)