Tension balancing system arranged at bottom of stand pipe

Abstract

The invention discloses a tension balancing system arranged at the bottom of a stand pipe. The tension balancing system comprises a stand pipeline terminal, a tension balancing anchor chain and a deepwater suction pile; one end of the tension balancing anchor chain is connected to a lifting lug at the pipeline terminal through a shackle, and the other end of the tension balancing anchor chain is connected to an underwater ROV lifting hook on the deepwater suction pile through a reinforcing ring; the tension balancing anchor chain is composed of a reinforcing ring, a special end ring, an end ring, a common chain ring and the shackle which are connected in sequence; and the deepwater suction pile comprises an ROV (remote operated vehicle) platform and an ROV lifting hook, and the ROV lifting hook is fixed on the ROV platform. According to the tension balancing system, a steel catenary riser is connected to a riser pipeline terminal, unbalanced tension is transmitted to the deepwater suction pile through the tension balancing anchor chain, passive balancing of tension is achieved due to the unidirectional stress characteristic of the anchor chain, and the purpose of protecting integrity and safety of deepwater subsea pipeline end facilities and underwater facilities connected to the deepwater subsea pipeline end facilities is achieved.

Description

technical field [0001] The invention relates to a tension balancing system arranged at the bottom of a riser. Background technique [0002] One end of the steel catenary riser (SCR) is connected to the floating production system and the other end is connected to the subsea pipeline terminal. It is the key production medium transportation channel between the underwater production facility and the floating system. High pressure environment has strong adaptability, so it is one of the most widely used riser forms in deep sea development. However, if the length of the steel catenary riser (SCR) seabed section is limited or the soil axial stiffness of the seabed section is too small to provide sufficient anchorage resistance for the entire riser, the movement of the floating production system under extreme environmental conditions will Large axial tension is generated at the end of the seabed section of the pipe, resulting in the irreversible movement of the riser toward the pla...

AI Technical Summary

Problems solved by technology

However, if the length of the steel catenary riser (SCR) seabed section is limited or the axial stiffness of the seabed section soil is too small to provide sufficient anchoring resistance for the entire riser, the movement of the floating production system under extreme environmental conditions will be in the vertical position. Large axial tension is generated at the end of the seabed section of the pipe, which leads to irreversible movement of the riser towards the platform, which affects the integrity of the connector at the end of the pipeline and the jumper pipe, and causes problems such as leakage and damage of the entire system

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