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Enhanced Water Flooding Sweep Efficiency by Induced Formation Damage in Layer-Cake Reservoirs

机译:通过层蛋糕储层造成的形成损伤,增强了水淹水扫效效率

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Water channeling through high permeable layers during water flooding results in poor sweep efficiency. There are high costs involved in chemical methods of controlling mobility. Many laboratory studies evidence that injection of water with low salt concentration leads to significant decrease in the core permeability. In this paper the possibility of applying induced fines migration as an enhance oil recovery technique was investigated by modeling of the process. It was shown that the system of equations for water injection with induced formation damage is equivalent to polymer-flooding. It enabled applying polymer option of Eclipse black-oil simulator to model low salinity water flooding with induced formation damage. Investigation of the effect of induced formation damage on sweep efficiency during high salinity and low salinity water flood were the main aims of this study. Eclipse polymer flood model was used to model water injection with induced formation damage in a two layer cake reservoir. Analysis of modeling results showed that induced formation damage was favorable to sweep efficiency. Displacement of oil with low salinity water with induced formation damage resulted in up to 19% extra oil recovery. The sensitivity study showed that improved sweep during low salinity water injection was sensitive to heterogeneity, permeability reduction value, and slug volume. Introducing the permeability dependency of formation damage coefficient reduces IOR effects of induced formation damage during low salinity water flooding if compared with the case of constant formation damage coefficient. Several water flood scenarios with injecting different volume of low salinity water were modeled in order to determine the optimum low salinity slug volume. It was shown that injection of 0.5 PVI of fresh water with high salinity water drive results in similar incremental recovery if compared with continuous injection of low salinity water.
机译:在水洪水期间通过高渗透层进行水导致较差的扫描效率差。控制流动性的化学方法有很高的成本。许多实验室研究证据表明,用低盐浓度注射水导致核心渗透性的显着降低。本文通过对过程建模研究了施用诱导罚款迁移作为增强的采油技术的可能性。结果表明,用诱导的形成损伤的注水方程系统相当于聚合物泛化。它使Eclipse Black-Limulator的聚合物选择适用于诱导形成损伤的低盐水泛水。对高盐度和低盐水洪水促进效率的诱导形成损伤效果的调查是本研究的主要目的。 Eclipse聚合物泛洪模型用于模拟水注射与两层蛋糕储层中诱导的形成损伤的注水。建模结果分析表明,诱导的形成损伤是有利的扫描效率。用诱导的形成损伤的低盐度水的油使得额外的溢油损伤造成高达19%。敏感性研究表明,在低盐度注水期间改善扫描对异质性,渗透率降低值和块体积敏感。介绍形成损伤系数的渗透性依赖性,如果与恒定形成损伤系数相比,在低盐水泛水期间诱导形成损伤的IOR效应。采用注入不同体积的低盐度水的几种水洪氛,以确定最佳的低盐度块体积。结果表明,如果与连续注射低盐度水相比,用高盐度水驱动的淡水的0.5pvi的注射导致相似的增量恢复。

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