化学驱波及效率和驱替效率的影响因素研究

Influence factors of oil displacement efficiency and sweep efficiency in chemical flooding

在对一个非均质程度严重的油藏进行波及效率和驱替效率定量描述的基础上,利用我国自行研制的ASP数值模拟软件,建立了一系列正韵律二维剖面地质模型,对比研究不同的油藏非均质性对化学驱波及效率和驱替效率的影响。在渗透率层间级差相同的情况下,高渗透层厚度与总厚度的比例不同,聚合物驱和三元复合驱的驱油效果不同;分析研究了重力作用对三元复合驱驱油效果的影响,并提出注采井距的缩小会削弱重力作用的影响。研究表明,地质模型不同,化学驱驱油效果的差异很大。对三元复合驱和聚合物驱进行油藏适应性研究,对提高水驱后采收率有着十分重要的意义。

On the basis of quantitative description of the sweep efficiency and oil displacement efficiency of a serious heterogeneous reservoir, a series of normal rhythm 2D section geologic models are established and the effect of different reservoir heterogeneity on oil displacement efficiency and sweep efficiency in chemical floodingis investigated by using chemical simulator ASP 2.0 developed by RIPED, PetroChina. If the thickness ratio of the high permeability formation to the general reservoir changes with same permeability difference between layers, then the oil displacement efficiency of polymer flooding and Alkali/Surfactant/Polymer (ASP) flooding is different. The effect of gravity on the oil displacement efficiency of ASP flooding is studied, suggesting that reducing the producer-in-jector spacing could decrease the gravity effect and the oil displacement efficiency of ASP flooding for different geological models make great difference. It is important to study the reservoir adjustability of ASP flooding and polymer flooding for improving the recovery after water flooding.