低渗透油藏表面活性剂降压增注机理研究

低渗透油藏是我国重要石油资源组成部分,大多数的低渗透油田以注水开发方式为主,低渗透油藏普遍存在着孔喉细小、渗透率低、渗流阻力大等特征,从而导致注水驱替压力较高、注入速率低、采收率低等一系列的问题。压裂技术对低渗透储层改造起到了一定的作用,但是作用时间和范围非常有限。因此,对低渗油藏表面活性剂驱替及降压增注机理的研究,在低渗油藏开发中意义重大。主要对低渗油藏降压增注用表面活性剂的驱油机理方面做了综述,对低渗透油藏化学驱的现场应用提供一定帮助。

The mechanism research of decreasing injection pressure and increasing injection rate by surfactant in the low permeability oilfield

The reserve of low permeability reservoirs has become an important part of petroleum resources in China at present.Waterflooding development approach is mainly used in most of the low permeability oilfield.Small pore,low permeability and large flow resistance are common in low permeability reservoirs.These factors cause the high injection pressure and reducing injection rate.Fracturing technology play a certain role in low permeable reservoir reconstruction,but action time and range is very limited.So is significant to study surfactant flooding and lowering injection pressure mechanism in low permeability reservoirs.The mechanism of decreasing injection pressure and increasing injection rate by surfactant is mainly discussed in this paper.This study can provide certain theoretical guidance and basis for the practical application of chemical flooding in low permeability reservoirs.