用数值模拟方法研究胶体分散凝胶(CDG)在厚非均质储层中的扩散

T. K. Khamees, R. Flori
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引用次数: 3

摘要

在过去的几十年里,关于胶体分散凝胶(CDG)比聚合物驱更能提高波及效率的问题一直存在争议。本研究利用CMG-STARS模拟器建立了数值模型,研究了0.1 PV的CDG段塞流注入四分之一倒九点模式的行为。该段塞由0.1 wt. %的HPAM聚合物溶液组成,聚合物与交联剂的比例(P/X)为50/1。该模型以非均质性高、流动性差导致的高含水稠度非均质储层为代表。在数值模型中应用了不同文献的实验结果,研究了这些参数对CDG传播的影响。结果证实,CDG比聚合物溶液更能深入盗贼层,降低盗贼层的渗透率。此外,研究结果表明,CDG的剪切减薄行为有助于选择性渗透到高渗透条纹中,从而降低了用机械方法隔离盗贼层的成本。结果表明,润湿性对处理效果有较大影响。因此,与油湿体系相比,水湿体系的效果更好,对低渗透层的破坏更小。结果表明,在考虑CDG不可逆吸附时,对后处理水的性能估计过高。然而,即使采用可逆吸附,长时间注入后处理水也不能消除CDG驱油引起的渗透率降低。结果表明,CDG的降解程度越高,回收率越低。结果表明,考虑聚合物和CDG联合注射的重要性。结果还表明,储层盐水和/或补充水的盐度越高,采收率越低。此外,随着聚合物/交联剂比的增加,回收系数减小,而随着聚合物水解的增加,回收系数和残余阻力系数增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the Propagation of the Colloidal Dispersion Gel (CDG) in Thick Heterogeneous Reservoirs Using Numerical Simulation
Over the last few decades, there has been a dispute regarding the ability of colloidal dispersion gels (CDG) to improve sweep efficiency more than polymer flooding. In this study, a numerical model was built using the CMG-STARS simulator to investigate the behavior of injecting 0.1 PV of CDG slug into one quarter of inverted nine-spot pattern. This slug was composed of 0.1 wt. % HPAM polymer solution with a polymer-to-crosslinker ratio (P/X) of 50/1. The model was represented by a thick heterogeneous reservoir with high water cut caused by high heterogeneity and adverse mobility ratio. Different experimental results from published literatures have been implemented in the numerical model to study the effect of these parameters on the propagation of the CDG. The results confirmed that CDG could propagate deep into the thief zones and reduce their permeability more than polymer solution. Moreover, the results showed that the shear-thinning behavior of CDG could assist the selective penetration into the high-permeability streaks only, thus reducing the cost of isolating the thief zones by mechanical methods. In addition, the results showed that the wettability had tremendous effects on the treatment. Therefore, the water-wet system yielded higher results with less damage to the low-permeability layers compared to the oil-wet system. The results showed an overestimation of the performance of post-treatment water when considering irreversible adsorption of CDG. However, the prolonged injection of post-treatment water would not remove the permeability reduction caused by CDG flooding, even with reversible adsorption. The results revealed that the higher the degradation of the CDG, the lower the recovery factor. The results showed the importance of considering a combination injection of polymer and CDG. The results also revealed that the higher the salinity of the reservoir brine and/or the makeup water, the lower the recovery factor. In addition, as the polymer/crosslinker ratio increases, the recovery factor decreases, while as the polymer hydrolysis increases, the recovery factor and residual resistance factor increases.
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