平台运动对深水钻井隔水管非线性动力响应的影响(英文)

Vessel Motion Effects on Nonlinear Dynamics of Deepwater Drilling Riser

文章建立了波浪、海流和船体运动等载荷综合作用下的深水钻井隔水管非线性时域动力响应模型,模型考虑了顶部张力和隔水管内部泥浆对隔水管动力响应的影响,计入了张力沿隔水管长度的变化,并采用有限差分法求解了四阶偏微分运动方程。计算了随机波浪和规则波浪下船体运动对深水钻井隔水管非线性动力响应的影响,研究分析了船体平均偏移以及波频响应和低频响应的周期和幅值对深水钻井隔水管动力响应的影响。结果表明,船体运动对深水钻井隔水管动力响应有较大的影响,在随机波浪和海流作用下,考虑船体运动时,隔水管上部最大弯矩增大了59%。船体的平均偏移主要影响底部最大弯矩。船体波频运动对上部最大弯矩有较大影响,随着波频响应的周期和幅值的变化,上部最大弯矩变化较快,而低频响应的则主要影响隔水管上部弯矩。

A time domain computer model for deepwater drilling riser subjected to waves,ocean currents and vessel motion was developed in this paper.The vessel motions effects on the dynamic response of deepwater riser are investigated,including mean offsets,wave frequency motions,low frequency motions,period and amplitude of the motion.The results show that vessel motion has an important effect on the dynamic response of deepwater riser,and lead to an increase of upper maximum bending moment by 59% compared to the case without vessel motion,under random waves and current.The mean vessel offset has main effect on lower maximum bending moment.Wave frequency motion has notable effect on the upper maximum bending moment of the drilling riser,and changed sharply with amplitude or period of the wave frequency motion decreasing.Low frequency motion mainly affects the upper maximum bending moment of the drilling riser.