Abstract: Profile control treatment is a key measurement to control water in production well and improve waterflooding performance by reducing fluid channeling through higher-permeability thief zones.It plays an important role in waterflooding oil-field.The effect of such treatment often depends on placing the gel preferentially in the thief interval.Based on a lot of core experiments,this paper analyzes some factors which influence the selectivity of gellant when gellant can or cannot form face plugging.If gellants can form face plugging in low permeability zones,the influence of permeability ratio,gelation time,the absolute permeability of non-target zone on the selectivity is discussed.If gelant cannot form face plugging in low permeability zone,the influence of mobility ratio of oil and water,permeability ratio,resistence factor and initial pressure gradient of low permeability zones on the selectivity is discussed by sand-packed glass model tests and numerical analysis methods.Finally,based on core experiments,several methods such as controling injection pressure,forming face plugging and temporary plugging agents injection are tested to determine whether they can be exploited to optimize gel placement.

Key words: profile control agent, non-target zone, damage, initial pressure gradient, face plugging, temporary plugging agent, protection and release, method

摘要： 注水井调剖作为控制油井含水、提高水驱效果的一项重要措施在注水开发油田发挥了十分重要的作用,而调剖效果的好坏很大程度上取决于调剖剂的选择性进入能力.本文以岩心实验为基础,针对调剖剂能否在非目的层形成表面堵塞的两种情况,分析了影响调剖剂的选择性进入能力的因素.对于调剖剂能在非目的层形成表面堵塞的情况,分析了渗透率级差、调剖剂的地面交联强度、非目的层绝对渗透率等因素对调剖剂选择性进入能力的影响;对于调剖剂不能在非目的层形成表面堵塞的情况,采用平面夹砂模型实验和数值分析方法研究了油水流度比、渗透率级差、调剖剂的阻力系数和低渗透层启动压力等因素对调剖剂选择性进入能力的影响.结合岩心实验对如何防治调剖剂对非目的层伤害的方法进行了研究,分析了控制注入压力法、形成表面堵塞法、暂堵剂注入法在减少调剖剂对非目的层伤害中的作用.

关键词: 调剖剂, 非目的层, 伤害, 启动压力, 表面堵塞, 暂堵剂, 防治, 方法