Design of National Thread for Casing, Tubing, and Oil and Gas Downhole Equipment

Document Type : Research Paper

Author

Department of Petroleum, Material, and Mining Engineering and Technical Faculty, Islamic Azad University Central Tehran Branch, Tehran, Iran

Abstract

Well integration aims to protect human life and the environment by reducing the risk of uncontrolled oil and gas production release during its life cycle. Well integrity requires safe connections for the casing, tubing, and downhole equipment. In this research, using modeling and simulation software by finite element method, a premium connection has been designed, which is required for the current conditions of oil and gas wells. The connection was loaded according to the international standard ISO 13679 in a triaxial loading, including the axial loads of tension and compression with internal and external pressure. The analysis results were evaluated using the criteria of stress and sealability. The results showed that the designed connection fully meets the standard requirements. The amount of stress created at different loads is lower than the yield strength of the material, while the contact pressure of the sealing surfaces makes reliable sealability. It was found that design by finite element analysis can be a reliable and inexpensive tool and an alternative to physical experiments.
 
 

Keywords

References

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Journal of Petroleum Research
Volume 32, 1401-6 - Serial Number 127
January and February 2023
Pages 126-140

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