高含水油田提高水驱采收率技术的研究进展

RESEARCH ON TECHNOLOGY OF ENHANCE WATER DRIVE RECOVERY FACTOR IN HIGH WATERED OILFIELD

高含水油田水驱采收率的提高,对降低采油成本、稳定我国油气产量、满足国内经济发展要求意义重大。储层非均质性、驱动压力、裂缝与注采井网匹配关系等对提高水驱采收率有重要影响,裂缝、润湿性、启动压力梯度和黏度等是提高碳酸盐岩油田、低渗透油田和稠油油田水驱采收率必须予以考虑的因素。水动力学和多种工艺结合技术以及剩余油分布研究及挖潜技术在国内外有着广泛的应用。就目前国内外相关研究来看,我国水动力学方法提高水驱采收率机理仍需进一步深入研究,加强剩余油气分布及挖潜研究,提出解决储层非均质性与波及体积系数、剩余油气分布与注采井网、油水气流度比与驱油气效率之间矛盾的方法将是未来有效提高水驱采收率的关键配套技术方法。

Enhancing water drive recovery factor in high watered oilfield is very important to reduce costs and keep oil and gas production.Reservoir heterogeneity,driving pressure,and matching relations of fractures and injection-production well pattern have effect on improving water drive recovery factor.Fractures,wettability,viscosity and starting pressure gradient must be taken into account to improve the water flooding oil recovery of carbonate reservoir,low permeability reservoir and heavy oil reservoir.Hydrodynamic method,combined multi-technologies,as well as the study of remaining oil distribution have been used both at home and abroad.Study results showed that hydrodynamic method needed further study in China.The methods to strengthen the remaining oil distribution and potential research,to solve the discrepancy of reservoir heterogeneity and the swept volume coefficient,the discrepancy of remaining oil distribution and injection-production well network,and discrepancy of oil-water mobility ratio and oil displacement efficiency are key techniques for enhancing water drive recovery factor in the future.