With the development of offshore oil and gas into the deep sea,virtual flow meter has become an important measurement method of oil and gas well production,and the core algorithm is the flow calculation model.This paper introduced wellbore and nozzle flow calculation model of virtual flow metering system,and established the j umper flow calculation model based on the characteristics of cross pipe.This paper introduced D-S evidence theory,established the weight extraction model of multi-flow-model,employed Dempster’s rule to deal with the weight of each flow model,and finally attained the fusion flow calculation model of condensate gas wells.The results show that the fusion model can effectively improve the flow calculation accuracy and reliability on the whole,and predict the flow changes in the next period of time,which provides a new idea and method for the development of virtual flow meter.%随着海洋油气开发走向深海，虚拟流量计逐渐成为水下油气井产量计量的一种重要方式，其核心是流量计算模型。介绍了虚拟流量计的井筒和油嘴模型，并基于跨接管的流动特点建立了跨接管流量计算模型。根据D-S证据理论建立了各流量模型的权重提取模型，并利用Dempster法则对各模型权重进行融合处理，最终得到基于D-S理论的凝析气井流量融合计算模型。结果表明，该融合模型在整体上有效提高了流量计算的精度和可靠性，且对短时间内的流量变化具有较好的预测能力，为水下虚拟流量计的研发提供了一种新的思路和方法。
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