Multifunctional suspension system for deepwater drilling riser and evaluation of its application in sea trial

doi:10.16265/j.cnki.issn1003-3033.2026.01.0195

Abstract

Abstract:

In order to reduce the dynamic loads on risers under harsh sea conditions and enhance their adaptability to complex marine environments, a multifunctional suspension system for deepwater riser was proposed, which included a suspension system, a hydraulic compensation system, and a measurement and control system, in order to ensure the safety of the suspended riser under severe sea conditions such as typhoons in the South China Sea. In addition, the system can also be applied to transit with a suspended riser between wells, which can significantly reduce the load of the suspension riser. The suspension system suspends a single bearing riser system, and relieves the stress concentration on the top of the riser by means of a centralizer and a hinge joint; the hydraulic compensation system adopts three working modes of differential throttling compensation, passive non-throttling compensation and throttling shielding to meet the requirements of platform avoidance and inter-well transit. The measurement and control system monitors and warns in real time, regulates and controls the telescopic movement of the hollow hydraulic cylinder, and realizes the real-time compensation of the dynamic load of the riser system. The system has undergone sea trial applications, the results show that the proposed multi-function suspension system can significantly reduce the riser top stress and dynamic load amplitude, especially in the differential throttle compensation and passive non-throttle compensation modes. At the same time, the downstream and upstream speeds of the platform are increased to 1.0 knots, which significantly improves the operation efficiency. The system helps to overcome the challenge of traditional suspension mode, provides a safe and efficient solution for deepwater drilling riser operations, and reduces the disaster risk of suspension riser under extreme sea conditions such as typhoons.

Key words: deepwater riser, multifunctional suspension system, compensation mode, measurement and control system, centralizer devise

CLC Number:

X937

SHENG Leixiang, YIN Zhiming, LI Yanwei, LIU Xiuquan, WANG Jinlong, GUO Weihua. Multifunctional suspension system for deepwater drilling riser and evaluation of its application in sea trial[J]. China Safety Science Journal, 2026, 36(1): 97-103.

Figures/Tables 11

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Table 1

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模式	节流屏蔽模式	差动节流补偿模式			被动非节流补偿模式
		比例插装节流阀组的阀口开度/%			顺流航速/kn					逆流航速/kn
		100	80	60	0.2	0.4	0.6	0.8	1.0	0.2	0.4	0.6	0.8	1.0
动载补偿率/%	93.34	95.46	94.17	94.25	96.33	96.14	96.67	95.91	96.17	96.37	96.21	96.45	96.51	96.01

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