低渗透厚油藏周期注水适应性分析.docVIP

摘 要 中国陆上已开发油田的地质储量中特低渗透油藏储量约占 10%，已探明未动用储量中有一半以上是特低渗透储量，这就迫切需要对特低渗透油藏进行有效的开采，满足国内对石油的需求。同时近几年来，油价的不断攀升，也为特低渗透油藏的开发创造了经济上的可行性。 本文是在调研国内外特低渗透油藏开发技术的基础上，分析了井距与井网密度的关系以及技术井距、经济井距的计算方法，从低渗透油藏注水开发效果的几项评价指标；并对直线排状、五点法、反九点、反方七点、反七点五种注采井网进行了数值模拟研究，通过采收率和含水率的变化情况，确定了适合特低渗透油藏的井网形式；在对合理井距和注采井网研究的基础上，对特低渗透油藏注水开发的开采特征、存在的问题和影响因素做了阐述和分析，并利用数值模拟方法对超前注水、周期注水两种开发方法进行了研究，分析了其影响参数；同时采用数值模拟方法对氮气驱和二氧化碳气驱开发方式进行研究，考虑的影响因素有注气时机、注入速度、注入方式、气水比、段塞大小等。最后通过对注水注气开发方式的综合比较，总结分析了适合特低渗透油藏的有效动用方式。 关键词：低渗透；合理井距；注水；注气；数值模拟 Abstract The ultra-low permeability accounts for 10% of the geological reserves of developed oil fild,and occupy half of the proven but untapped reserve on land.This urgent needs to carry on effective exploitation to the ultra-low permeability reservoir,satisfies the oil demand of country.At the same time, the rising oil price in recent years creates the economic feasibility for ultra-low permeability reservoir development. This paper researches ultra-low permeability reservoir development technologies both at home and abroad.Analyzes the well spacing and the well pattern density relations, as well as technical well spacing and economical well spacing computational method,thus the analysis method of rational well spacing through the technical well spacing and the economical well spacing computation has determined.And through numerical simulation researching for row well pattern,five-spot pattern,reverse nine-spot pattern,skewed four-spot injection pattern and reverse seven-spot patten,determining the well-pattern type that suits the ultra-low permeability by the water-cut and recovery alternation.Base on the research of rational well spacing and well-pattern, elaborating the waterflooding recovery feature,existing problems and influence factors,studing on advanced and cyclic water injection by using numerical simulation method and analysing it’s influencing factor.Simultaneously,by using