中文摘要：

稠油油藏采用多分支井进行注蒸汽热采时，由于每个分支所处地层的吸汽能力不同，所需的蒸汽流量也不同。基于节点分析系统理论和微元段思想建立了蒸汽分配计算模型，实现了数学解法并进行了应用分析。根据蒸汽沿程热损失分布模型及点分流模型及各个分支所在地层的油藏参数，计算了蒸汽在垂直段、弯曲段的沿程热损失及各分支水平段的地层吸汽指数和蒸汽流量，为稠油油藏多分支井热采参数设计提供了理论参考依据。

英文摘要：

During steam injection recovery of the heavy oil reservoir using multilateral wells, the needed steam flow rate of each branch is different as it has different steam injection ability. Based on the nodal analysis and segmentation method, the steam distribution model is built, to provide a mathematical solution. According to the reservoir patameters of each branch, the model calculates the heat loss during steam flowing in the pipe and the different steam flow rate in different branch. The results can provide theoretical reference for the thermal recovery parameter design of heavy oil reservoir using multilateral wells.