注水开发油藏剩余油饱和度测量与监测技术及应用

MEASURE AND MONITIORING TECHNIQUES OF REMAINING OIL SATURATION IN WATERFLOOD DEVELOPMENT RESERVOIR AND ITS APPLICATION

我国大部分注水开发油藏采出程度高,综合含水率高,采收率低,而新增及剩余储量可动用性差。地下的剩余油对于增加可采储量和提高采收率具有巨大的潜力。文章简要介绍了剩余油的形成条件、分布形式、影响因素、研究方法等;剩余油研究的关键技术则是其含油饱和度的确定。所以文章重点介绍了针对裸眼井或套管井的中子寿命测井(NLL)、碳氧比(C/O)能谱测井等核法剩余油饱和度测井技术;电阻率测井等电法剩余油饱和度测井技术,并分析了孔隙度、胶结指数、地层水、储层温度、压力等地层参数对阿尔奇公式的影响,提出了消除地层水高矿化度影响的方法。在对剩余油饱和度的各种测量与监测手段比较分析后,文章阐述了该技术现状和发展趋势,并结合三次采油,对利用剩余油饱和度测量和监测手段进行剩余油挖潜的工艺技术予以探讨。

In China, most waterflooding oil reservoir is exploited overly, the integrated water content ratio is high, but the recovery ratio is low, newly increased and residual reserves is not available. Underground remaining oil has a great potential to increase exploitable reserve and recovery ratio. This paper briefly introduced the forming conditions, distribution, influencing factor and research method of remaining oil. The key technique to study remaining oil is confirming its oil saturation. So, this paper introduced some logging technologies of remaining oil saturation in the open hole well and cased hole, such as Neutron Lifetime Logging(NLL), Carbon-Oxygen(C/O) Spectral Logging and resistivity log etc., and analyzed the influence of some parameters such as porosity, cementation index, formation water, temperature and pressure on Archie formula, and put forward the method to eliminate the influence of high salinity formation water. Compared and analyzed the measure and monitoring means to remaining oil saturation, this paper expounded the actuality and developing trend of remaining oil saturation logging technology.