Structure Design of Tubing Hanger for Deep Subsea Christmas Tree

doi:10.11885/j.issn.1674-5086.2023.10.07.03

Abstract

Abstract: The subsea christmas tree is a critical piece of equipment for deep-sea oil and gas development. The tubing hanger, serving as a channel for oil and gas and an electricity, supports the tubing column and seals the annular space between the tubing and casing, making it a core component of the christmas tree. Its structural strength directly impacts the safety of oil and gas production. Taking the tubing hanger from an oil and gas field in the South China Sea as an example, and analyzing foreign tubing hangers, the main structural dimensions of the underwater christmas tree's tubing hanger were designed. Finite element analysis was employed to establish the finite element model of the tubing hanger, and numerical simulations were conducted for its operations during the lowering process, installation, normal production, and locking and unlocking procedures. The results indicated that during the lowering process, the maximum stress of the tubing hanger was 310.43 MPa, with a maximum deformation of 0.450 09 mm. During the installation process, the maximum stress was 310.43 MPa, with a maximum deformation of 0.408 85 mm. Under normal production conditions of 69 MPa and 64 ℃, the maximum stress at the oil outlet of the tubing hanger was 311.13 MPa, with a maximum deformation of 0.581 48 mm. At 69 MPa and 121 ℃, the maximum stress was 586.93 MPa, and the maximum deformation was 1.334 70 mm. The analysis shows that the designed tubing hanger meets the safety strength requirements, exhibits minimal deformation, and has good structural safety. This tubing hanger has been successfully applied to China's first domestically developed underwater christmas tree system, which plays a significant role in advancing the localization of China's underwater oil and gas production systems.

Key words: subsea christmas tree, tubing hanger, structural calculation, locking, unlocking

CLC Number:

TE952

ZHU Junlong, LI Yufang, RU Mengqi. Structure Design of Tubing Hanger for Deep Subsea Christmas Tree[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 175-184.

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