纳米分散体驱油技术在渤海Q油田的研究与应用

Research and Application of Nano-dispersion Oil Displacement Technology in Bohai P Oilfield

针对渤海Q油田纵向层多、层薄、非均质性强,注入水沿高渗层突破日益严重,注入水质严重超标,常规的调剖、调驱体系易造成注入压力高、注入困难及中低渗透层伤害等问题,开展了纳米分散体驱油技术室内研究及现场试验。结果表明浓度为0.5%的纳米分散体溶液可使Q油田油水界面张力降低到10-3级别,对原油降黏率达到48.7%,岩心驱替动态洗油效率相比水驱提高25%~46%;该技术在海上油田的首次现场应用取得了良好的增油降水效果,实验井组3口油井含水率降低了3%~10%,在6个月有效期内累计增油6158 m3,为进一步改善油田开发效果提供了新的思路和方法。

In view of multiple and thin vertical layers,heterogeneity of Bohai Q oilfield,the injection water broke through along the high permeable zones,thus the water cut rose rapidly.Due to seriously over-standard injected water quality,the conventional flood control technology confronted with many problems such as high injection pressure,difficulty in injection,and damage to low and medium permeability layers,thus laboratory experiments and filed test of nano-dispersion oil displacement technology were researched in this paper.The results showed that nano-dispersion agent with 0.5%concentration can reduce the oil-water interfacial tension of Q oilfield to 10-3 level,and the viscosity reduction rate of crude oil reaches 48.7%,the dynamic oil washing efficiency of core flooding can be increased by 25%~46%compared with water flooding.A pilot nano-dispersion oil displacement experiment was carried out,the field test is very successful,with an oil increment of 6158 m3 within the validity period of 6 months.It is of great significance to further improve the development of the oilfield.