笼统注入时弱凝胶穿透深度分析

摘要

The weak gel flooding technology can enhance oil recovery by a wide margin and has been an important technology in tertiary recovery already. On the basis of the Darcy equation and mass balances,this paper establishes a mathematical model on penetration depth of weak gel in different permeability cores , including linear and radial flow, which can be applied to analysis affecting factor selective entering into formation in commingled injection. The results indicated that penetration depth decreases with permeability contrast increasing, and increases with resistance factor increasing. Penetration depth in low permeability layer is lower in linear than that in radial flow. All conclusions are important guideline significance for weak gel applied in field.%弱凝胶驱油技术能够大幅提高采收率,已成为油田三次采油的一项重要技术.根据达西定律和质量守恒定律,建立了线性和径向流条件下弱凝胶在不同渗透率岩心里的穿透深度的数学模型,该模型可用于分析笼统注入条件下影响弱凝胶选择性进入地层能力的因素.结果表明,弱凝胶在低渗透层的穿透深度随渗透率级差增大而减少,随阻力系数增大而增加;在相同条件下,线性流时在低渗透层的穿透深度低于径向流.这些结论对弱凝胶的现场应用具有重要的指导意义.