硅树脂基复合泡沫在水下多相流量计保温中的适用性分析

Applicability analysis of silicone resin composite foam in wet thermal insulation for subsea multiphase flow meter

合理的水下保温措施可防止海底管道内水合物的形成,是水下生产系统流动安全保障须重点考虑的问题。基于所研发的国产水下多相流量计的结构特点,建立了以50.8 mm厚的硅树脂基复合泡沫作为保温层的水下多相流量计保温效果分析模型,分别进行了内部流道介质最高温度(110℃)和最低温度(77℃)2种工况下的稳态及停机5 h的传热仿真分析,结果表明:2种温度工况下无论是稳态还是停机5 h时,水下多相流量计内部介质温度均高于水合物形成的临界温度(11℃),同时水下多相流量计伽马探头处的最高温度也在允许范围内,满足设计要求。在此基础上,通过理论计算验证了所选用的硅树脂基复合泡沫的涂层厚度也满足相关规范的要求。所研发的国产水下多相流量计在油田现场应用良好,充分说明采用50.8 mm厚度的硅树脂基复合泡沫作为水下多相流量计湿式保温材料的适用性。本研究成果为水下多相流量计的保温设计提供了参考。

Proper subsea thermal insulation can prevent the formation of hydrates in subsea pipelines,and special concerns shall be paid to the flow assurance of subsea production system.Based on the structural features of domestically developed subsea multiphase flow meter,an insulation effect analysis model for the subsea multiphase flow meter was built up by using 50.8 mm thick silicone resin-based composite foam as the insulation layer,and the heat transfer simulation analysis of internal flow channel medium was carried out under two working conditions of steady state and shutdown for 5 h at the maximum temperature(110 ℃) and minimum temperature(77 ℃),respectively.The results show that for either the steady state or shutdown for 5 h under those two temperature conditions,the internal medium temperature of subsea multiphase flow meter is higher than the critical temperature of hydrate formation(11 ℃),and the maximum temperature at the gamma probe of flow meter is also within the allowable range,which satisfy the design requirements.On this basis,theoretical calculations have verified that the coating thickness of the selected silicone resin-based composite foam also complies with the relevant specifications.The domestically developed subsea multiphase flow meter has been applied properly in oilfields,which fully demonstrates the applicability of wet insulation material that uses 50.8 mm silicone resin-based composite foam in subsea multiphase flow meter.The results of this research provide a reference for the thermal insulation design of subsea multiphase flow meter.