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水平井注蒸汽是开发特、超稠油的重要手段,但注汽过程中存在储层吸汽剖面不均衡、受热井段短、注汽效果不理想等问题。针对上述问题,本文在有限元分析的基础上建立了井筒-水平井油藏流动耦合模型和热-流-变形三场储层内耦合模型,根据数学模型推导出相应的Galerkin有限元公式,采用解耦数值方案求解耦合方程组,定量分析了蒸汽注入过程中流体的传导流动情况、蒸汽出口位置及储层内温度对吸汽剖面的影响,对改善储层吸汽剖面具有重要意义。通过研究湿蒸汽在储层内的流动、传热规律,为水平井注蒸汽开发稠油的方案设计、工艺参数优化提供重要的理论依据。
Horizontal well steam injection is an important means to develop extra-heavy and super-heavy oil. However, there are some problems such as unbalanced suction section of steam reservoir, short length of heated well section and unsatisfactory steam injection results during steam injection. In order to solve the above problems, this paper establishes three coupling models of flow-coupling and heat-flow-deformation in wellbore-horizontal well based on finite element analysis. According to the mathematical model, the corresponding Galerkin finite element formula is derived. The decoupled numerical solution solves the coupled equations and quantitatively analyzes the influence of fluid flow, steam outlet location and reservoir temperature on the suction profile in the process of steam injection, which is of great significance to improve the suction profile of the reservoir. By studying the flow and heat transfer law of wet steam in reservoirs, it provides an important theoretical basis for the design of heavy oil for horizontal well steam injection and optimization of process parameters.