新型张力腿式储油处理平台的动力响应分析

针对目前小油田早期生产中存在的不足,提出一种适用于浅水海域的新型张力腿式储油处理平台,该平台主要由储油箱、浮箱、吸力桩、系泊链和甲板结构构成,具备原油处理和储存功能。应用非线性时域耦合分析法,研究了有义波高、平均波周期、水深对该平台的运动响应和系泊链张力的影响。计算结果表明,波高对平台动力响应有较大影响,有义波高每增加0.4 m,平台水平位移相应增加0.408 m,而系泊链力随有义波高的增加呈准线性增大;波周期对平台水平运动影响显著,平均波周期从6.5 s逐级变化至8.5 s时,最大水平位移自3.760 m渐增至5.467 m,而波周期对系泊链力影响较小,变化率一般小于10%;该新型平台对水深大于20 m的浅水海域有良好的动力特性,而对水深小于20 m的海域却表现异常。因此,该新型张力腿式平台能满足水深不小于20 m浅海区的油田早期生产需要。

Dynamic Response Analysis of an Innovative Tension Leg Platform for Oil Storing and Processing

Considering the existing issues in the early production of small oilfields, an innovative tension leg platform for oil storing and processing is presented in this paper, which is particularly adapted to shallow sea areas. The platform consists of oil storage tank, buoyancy tank, suction anchor, mooring chain and deck structure and it has the capability of oil storing and processing. Utilizing the nonlinear time domain coupled analysis, this paper studies the effects of significant wave height, mean wave period and water depth on platform motion response and mooring chain tension. The numerical results show that the platform dynamic response is significantly affected by wave height. A 0.4 m increase in wave height results in a 0.408 m enhancement in platform horizontal deviation and consequently leads to a quasi-linear increase in mooring chain tension. The mean wave period has an obvious effect on the platform horizontal deviation. The maximum horizontal deviation gradually rises from 3.760 m to 5.467 m while the mean wave period changes from 6.5 s to 8.5 s, but the mooring chain tension almost keeps unchanged with the wave period and its change rate is less than 10%. The new platform has good dynamic characteristics for shallow water areas with the depth of more than 20 m, while it becomes abnormal for that with the depth of less than 20 m. Therefore, the innovative tension leg platform can meet the requirements in early production for the oilfield in shallow sea area whose depth is over 20 m.