半潜式钻井平台拖航阻力数值分析

半潜式钻井平台是深海油气资源勘探开发的重要装备。因油田内短距离拖航需要,某半潜式钻井平台可能遇到深吃水拖航工况。在此工况下,平台吃水12.5m,浮箱、横撑整体及部分立柱将位于水面以下并引起拖航阻力。采用FLUENT计算了某半潜式钻井平台深吃水拖航工况下的拖航阻力,并与浅吃水拖航工况拖航阻力进行比较。结果表明:拖航速度为2m/s时,该平台深吃水拖航阻力约为1 000kN,其中浮箱约占50%,立柱和横撑各占约25%;深吃水拖航阻力约为浅吃水拖航阻力的2～3倍。研究结果可为今后半潜式钻井平台的船型设计提供参考。

Numerical Simulations for Towing Resistance of Semi Submersible Drilling Platform

The semi submersible drilling platform plays an important role in the development of the deepwater oil resources. For the demand of the short distance translocation in an oil field,the deep draft towing maybe encountered. Under this condition,the whole pontoons and the braces,part of the cylinders submerged in the water which caused towage resistance, but there was no empirical data to consult. Thus the software FLUENT was used here to compute the drag resistance of the platform in a uniform viscous flow with deep draft,and the comparison was made to the one with a shallow draft. According to the results,under the speed of 2 m/s,the drag resistance of the pon-toons took about 50% of the whole,while the braces and the cylinders took around 25% each,the resistance with a deep draft was twice the one with shallow draft. The research results may pro-vide good proposal to the design of a new platform.