油田开发后期含水饱和度与含水率关系研究.doc

油田开发后期含水饱和度与含水率关系研究 摘 要：随着我国大部分油田进入开发中后期，油田采出液含水率非常高，特别是陆上油田采出液含水率平均已达百分之八十以上，然而采收率却不高，地层水淹严重，因此为提高采收率油田后期作业就尤为重要。我国大部分油田油层非均质性非常严重，特别是断块油气田，搞清油层水淹情况就显得较为困难，由于含水率和含水饱和度是油田开发过程中的重要监测指标，对于判断油田是否水淹、确定油田可采储量、评价水淹油藏剩余潜力等起关键作用，因此研究油田开发后期含水饱和度和含水率的关系就具有重要的意义。 针对这一状况，本文对现有的几种油层含水饱和度和含水率的求取方法，以及含水饱和度与含水率的指数关系式、直线式和Logistic关系式3种现有的含水饱和度与含水率关系进行了研究，并用油田数据进行了实例验证，以了解其优缺点和适用条件。 关键词：含水率；含水饱和度；水淹油藏；相对渗透率 The relation of water saturation and water cut at late stage of oilfield development Abstract：With the majority of oil field in china into the production tail, water cut of produced fluid is very highespecially onshore water cut has reached an average of eighty percent or more, but the recovery is not high, reservoir serious flooding, therefore, post-operation to enhanced oil recovery is particularly important. Since most of our oil reservoir heterogeneity is very serious, particularly oil and gas block, to find out the flooding of reservoir becomes more difficult, as water cut and water saturation is an important monitoring indicators of oil field development, to determine whether the reservoir flooded, to determine the recoverable reserves of reservoirs, to appraisal residual oil content of flood reservoir play a key role, therefore, to study the relationship of water saturation and water cut for production tail has a significance meaning. In view of this situation, in this paper, several existing reservoir water saturation and water cut method for calculating, and the exponential function relationship of water saturation and water cut, straight-line relationship, the relationship of Logistic three existing water saturation and water content were studied, and verify it with field case learn its theory and application conditions. Key words: Water cut , Water saturation , Flood reservoir , Relative permeability  目 录 1 绪论 1 1.1 研究课题的目的与意义 1 1.2 研究现状 1 1.2.1 含水饱和度与含水率的指数关系式 1 1.2.2 含水饱和度与含水率的直线关系式 2 1.2.3 含水饱和度与含水率的Logistic关系式 2 1.3 论文主要研究内容 3 2 含水饱和度和含水率的计算方法研究 4