In order to understand the percolation mechanism of sand-carrying cold production in heavy oil reservoirs and to predict production performance, force-summing on reservoir rock and sand grains is analyzed, the criteria for judging matrix sand and movable sand is established. 为了研究稠油油藏出砂冷采的渗流机理,准确预测其开采动态,在对储层岩土和砂粒受力分析的基础上,建立了骨架砂剥离判断准则和可动砂启动判断准则;