摘要
通过一系列接近实际油藏条件的物理模型实验,研究了注入饱和盐水—乙醇段塞体积大小、段塞注入方式、多油层的各层渗透率级差、单层渗透率、饱和盐水—乙醇体系的组分平衡等因素对封堵高含水层作用的影响。结果表明,向饱和氯化钠溶液中加入乙醇,降低氯化钠的溶解度,使其产生沉淀,封堵高含水层,调整吸水剖面,可显著提高砂岩油藏注水开发后期的原油采收率。
Through a series of physical model experiments similar to real oil reservoir conditions,some factors affecting the block-up of high water containing layers were studied.The factors are,respectively,injecting saturated brine-size of ethanol section stuff,means of section injection,infiltrating ratio difference of multi-layer reservoir,infiltrating efficiency of mono-layer reservoir,saturated brine-balance of ethanol system and etc.The result of the experiment showed that the recovery efficiency of crude oil for the later affusion development of sandstone oil reservoir can be greatly improved by putting ethanol into saturated sodium chloride liquid and reducing the solubility of soditan chloride,thus sediment was produced to block up high water containing layers and to adjust sopping section plane.
