Abstract: The precipitation or block of asphalts,asphaltenes and other organics in the porous media near the well-bore will reduce permeability due to changes of temperature,pressure and compositions of reservoir oil.Injection of organic aromatic solvents and soaking is one efficient method to remove the precipitates.A mathematical model to remove the formation damages caused by organic precipates by soaking of aromatic solvents is presented and solved by numerical method.The influences of different injected rate,volume and soak time of solvent had been simulated to improve the permeability of the damaged region.And the permeability is also predicted after soak.The simulated results coincide with the data from oil field.

Key words: asphaltene, formation damage, solvent soak, numerical simulation

摘要： 近井带温度、压力和组分等条件的变化会导致原油中的胶质、沥青质等有机物在油层孔隙内部沉积,降低渗透率,造成近井带油层伤害,而利用注入有机溶剂浸泡来解除近井带有机污染是一种有效的方法.文中建立了一个利用有机溶剂吞吐解除油层有机伤害的数学模型,并进行了数值求解.同时,针对一个实例,模拟了溶剂注入速度、注入量、闷井时间对渗透率改善效果的影响,并对改善效果进行了预测.矿场应用结果表明,该方法效果较好.

关键词: 沥青质, 油层伤害, 溶剂浸泡, 数值模拟