海洋深水钻井锚链的动力特性探讨

在深水及恶劣环境海域,锚泊系统作为平台或钻井船定位装置,显得至关重要.在深水钻井中,锚泊系统的锚链长,尺寸大,对应的强度也大.锚链的受力越来越复杂,随着水深的增加,动力学分析显得越来越重要.考虑了锚链工作时最小运动与最小系泊力之间矛盾的要求,即锚泊系统要求最适宜的刚度,选择合适的连续模型.并对深水钻井锚链的动力特性进行了计算分析,得到锚链的特征频率和振型,由此分析其动力响应的上限和下限.在设计和施工中应特别注意锚链的动力特性,以避开与海浪产生共振的频率.

Discussion of Anchor-Chain Dynamic Characteristics for Deep Water Offshore Drilling

In the deep water and bad surrounding ocean, it is very important that the anchor system severed as the located equipment of the platform or drilling boat. In the deep drilling, the bigger the anchor system sizes are, the stronger its strength is. The anchor-chain force subjected was more and more complex with the water depth increasing, so the dynamic analysis was very important. Considering the relations between the minimum movement and the minimum anchoring force, namely, the anchoring system required the most suitable stiffness, so the reasonable continuing model was selected. The characteristics frequency and vibration model of the anchor-chain was got by calculating and analyzing the dynamic properties of the deep water drilling anchor chain, and the up and down limits of the anchor-chain dynamic response were studied. The dynamic characteristics must be pay attention to void the resonance frequency with wave moving in design and construction.