水驱油藏含水率及采出程度相似理论研究

Similarity theory of recovery percent and water cut in water flooding reservoir

为使模拟实验结果更好地应用到油田,为油田开发方案提供理论指导,应用相似定数法导出了水驱油藏相似准则,经相似变换建立了采出程度和含水率相似准则。利用数值模拟方法对各相似准则进行了敏感性分析,利用相似理论函数论对敏感性较强的相似准则进行了研究。结果表明,水驱油藏采出程度及含水率同各相似准则之间满足乘积关系。根据此关系建立了水驱油藏含水率与采出程度的经验关系式。关系式中引入了相渗经验系数以消除模型与原型相渗差异。物理模拟实验与数值模拟结果的对比表明,所建立的经验关系式可以满足油田实际应用。

In order to apply physical simulation results into oilfields properly, equation analysis method was used to get the similarity criterion of water flooding reservoir, and after converting the similarity criterion, the similarity criterions of recovery percent and water cut were gotten. Using numerical simulation, sensitivity analysis was carried out for the similarity criterions. Using the function theory in similarity theory, the similarity criterion of severe sensitivity was studied. The results show that there exists a multiplication relationship among the recovery percent, water cut of water flooding reservoir and the similarity criterions. Based on the relationship, the empirical formulas of water cut and recovery percent were established, in which the relative permeability coefficient was introduced to avoid the difference between the model and prototype. Compared physical simulation with the numerical simulation, it shows that the empirical formulas built can be applied into the actual oilfields.