Numerical Study on Heat Transfer and Thermal Insulation of Subsea Christmas Tree Connectors
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摘要: 水下采油树和跨接管之间需要专用接头进行连接,其中以套筒式接头最为常见。在水下进行接头安装时,持续的热量交换会导致接头在停机条件下持续降温,因此必须预先评估相关的温度分布和热量传递问题,提高水下采油树系统的流动安全水平。根据水下油气开发的要求,结合已有经验,在水下采油树套筒式跨接管接头结构设计的基础上,采用耦合传热的数值模拟方法,对未进行保温的套筒式接头进行了模拟分析,并完成了包含保温腔的套筒式接头的传热计算;最后基于变物性的分析方法,对含有保温腔的套筒式接头进行了内流场分析。计算表明:没有保温措施的套筒式接头会产生局部过冷问题,所设计的保温腔能大幅度改善接头的整体保温效果,满足水下采油树8 h保温的基本要求。用耦合传热数值模拟方法分析水下采油树系统的传热与保温理论可行,结果可靠。Abstract: The subsea christmas tree and well jumper are connected by special subsea connectors and collet connector is commonly used.The connector installed underwater will induce continuous heat transferring to ambient cold seawater and cause excessive temperature drop under shutdown condition.Relevant temperature distribution and heat transfer problems must be evaluated so as to further increase the flow security of the subsea christmas tree.Based on the requirment of subsea hydrocarbon development,a coupled fluid-solid numerical method was adopted to analyze the heat transfer and fluid flow of the collet connector without thermal insulation treatment.In addition,this paper completed the numerical study on heat transfer of the collet connector covered by an insulation cavity(doghouse)and the inner flow field simulation of the collet connector based on the consideration of variable properties of fluids.The results show that local supercooled spot would be present in the connector without any insulation measures and the doghouse could greatly improve the effect of thermal preservation on collet connectors which satisfy the basic principle of eight hours’ thermal insulation for subsea christmas trees.The method of coupling heat transfer of subsea collet connector is feasible in theory and reliable in calculation results.
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