ABSTRACT

In the process of deep-water offshore oil and gas exploration and development, it is necessary to have a complete subsea production system. The subsea tieback wellhead system is one of the core equipment in the floating drilling unit and subsea production system. During long-term service, the subsea tieback wellhead system often suffers from wave, current and other dynamic loads, and the system components are prone to fracture, resulting in safety problems in production operations. In this paper, a 3D finite element model of the subsea tieback wellhead system is established based on finite element analysis software and parameters of the marine environment in the South China Sea. In the quasi-static condition, the strength of subsea tieback wellhead system is checked.

INTRODUCTION

The exploration of global oil and gas reserves indicates that offshore oil and gas reserves are abundant and important. The South China Sea is rich in oil and gas resources, with proven oil reserves of about 23 billion to 30 billion tons. It is one of the world's four largest offshore oil and gas resource gathering centers. Therefore, exploring the new mode of offshore oil and gas development has gradually become the main direction of development. It was noted (Feng et al., 2013) that Subsea tieback wellhead system using jacket platform and Spar platform to develop oil and gas fields is a common engineering scheme for offshore oil and gas field development. Zhang et al. (2014) discussed that the research, test and improvement process of the key equipment of the cutting and recovery tool system of the deep-water wellhead system. It was found (Pecue and Jenkins, 1992) Texaco successfully completed three subsea wellhead tie-backs to a fixed (conventional) platform in Garden Banks Block 189, setting a then-record tieback depth. The subsea tieback wellhead system has better economic practicability in the operation process. It is noted (Pomfret et al., 1985) that the economic effectiveness of the tieback system during operation. Likewise, Reimert (1981) found that the tieback system is economical, practical and reliable in use. In terms of practical use, Lei et al. (2021) used a mathematical programming technique to evaluate the feasibility of the tieback technique. Ingram and Humphrey (1983) introduced the experience of tieback in the North Sea. Elhancha et al. (2016) describes some challenges of tieback operation.

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