Challenges and Solutions for Deepwater Drilling in the South China Sea

Xu, Liangbin; Zhou, Jinjun; Zhengli, Liu; Jiang, Shuyun

doi:10.4043/23964-ms

Cited by 8 publications

(3 citation statements)

References 0 publications

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“…In harsh environment, the connector between LMRP and BOP should be unlocked, and riser is hanged on drilling platform either in hard hang-off mode or soft hang-off mode. The top of riser is directly connected to chuck in hard hang-off mode, while the riser is hanged on the platform through tensioner system in soft hang-off mode [12,13].…”

Section: Operation Modesmentioning

confidence: 99%

Analysis on the Operation Fatigue of Deepwater Drilling Riser System

Liu¹,

Chen²,

Fu³

et al. 2016

TOPEJ

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Fatigue is one of main failure modes of deepwater drilling riser system. Analysis models of wave induced fatigue and vortex induced fatigue of deepwater drilling riser are established according to the riser connection, installation and hang-off operations. Characteristics of wave induced fatigue and vortex induced fatigue of riser system in different operation modes are studied. The influence of each operation fatigue on the combined fatigue is also identified. The results show that wave induced fatigue damage and vortex induced fatigue damage of upper riser are large in installation and hard hang-off modes. The fatigue damage of riser system in soft hang-off mode is less than that in hard hang-off mode. The combined fatigue damage of the upper and lower riser is large. The lower riser is under the influence of wave induced fatigue and vortex induced fatigue, while the upper riser is mainly under the influence of wave induced fatigue, especially that in installation and hang-off modes. The fatigue damages of riser in installation and hang-off modes have a great influence on the combined fatigue of riser and cannot be neglected in riser fatigue analysis.

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Section: Operation Modesmentioning

confidence: 99%

Analysis on the Operation Fatigue of Deepwater Drilling Riser System

Liu¹,

Chen²,

Fu³

et al. 2016

TOPEJ

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“…In recent years, the deepwater drilling unit HYSY981, which is operated by the China National Offshore Oil Corporation (CNOOC), has drilled several exploration wells in the South China Sea (Xu et al 2013). Petroleum exploration in China has gradually progressed from nearshore to deepwater locations (Chen et al 2013;Hu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis and fatigue damage assessment for a deepwater test string subjected to random loads

et al. 2015

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The deepwater test string is an important but vulnerable component in offshore petroleum exploration, and its durability significantly affects the success of deepwater test operations. Considering the influence of random waves and the interaction between the test string and the riser, a time-domain nonlinear dynamic model of a deepwater test string is developed. The stress-time history of the test string is obtained to study vibration mechanisms and fatigue development in the test string. Several recommendations for reducing damage are proposed. The results indicate that the amplitude of dynamic response when the string is subjected to random loads gradually decreases along the test string, and that the von Mises stress is higher in the string sections near the top of the test string and the flex joints. In addition, the fatigue damage fluctuates with the water depth, and the maximum damage occurs in string sections adjacent to the lower flex joint and in the splash zone. Several measures are proposed to improve the operational safety of deepwater test strings: applying greater top tension, operating in a favorable marine environment, managing the order of the test string joints, and performing nondestructive testing of components at vulnerable positions.

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“…The riser is an important and weak link in the entire offshore drilling equipment. It is the bottleneck of offshore oil exploration and development, with the characteristics of high technology, high investment and high risk [1][2]. In deepwater drilling, the harsh marine environment makes the riser stress very complex, and the presence of boost line further exacerbates this complexity.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Riser Boost Line on the Thermal Stress of Riser in Deepwater Drilling

Luo

Jun

Yang

et al. 2019

MSF

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In deep water drilling, the existence of boost line makes the wellbore temperature change violently, and the thermal stress caused by it has a great influence on the strength of the riser. The paper considers the variable mass flow caused by the boost line fluid entering the wellbore during deepwater drilling. Based on the principle of conservation of mass and energy, the paper establishes a mathematical model for transient heat transfer in different regions of the wellbore and formation, analyzes the effect of the displacement of boost line on the temperature field of the wellbore, and calculates the transient stress of the casing under thermal effect. The results show that with the increase of cycle time, the temperature of the inner wall of the riser above the critical well depth first decreases and then increases. The thermal stress of the inner wall of the riser first increases and then decreases to zero, and then gradually increases, and the final thermal stress remains unchanged. With the increase of cycle time, the thermal stress of the inner wall of the riser increases with the increase of the circulating temperature of the inner wall of the riser below the critical well depth, and the rate of increase decreases gradually, and the final thermal stress remains unchanged. As the displacement of the riser increases, the circulating temperature of the inner wall of the riser increases, and the thermal stress on the inner wall of the riser increases. The research results can provide reference for the analysis of the factors affecting the riser stress in deep water drilling.

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Challenges and Solutions for Deepwater Drilling in the South China Sea

Cited by 8 publications

References 0 publications

Analysis on the Operation Fatigue of Deepwater Drilling Riser System

Analysis on the Operation Fatigue of Deepwater Drilling Riser System

Nonlinear dynamic analysis and fatigue damage assessment for a deepwater test string subjected to random loads

Influence of the Riser Boost Line on the Thermal Stress of Riser in Deepwater Drilling

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