一种对残余油饱和度合理值范围的预判方法

A prejudge way for reasonable value range of irreducible oil saturation

 李金宜 陈丹磬 朱文森 信召玲

 （中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300452）

 (Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China)

 基于室内实验数据，围绕影响残余油饱和度的两大主控因素——流体性质及岩心物性，深入分析在相同油水黏度比下残余油饱和度随着岩心物性改变的规律。研究结果表明，渤海油田稀油相渗残余油饱和度随岩心物性变化会出现阶段性的趋势拐点，且低渗和常规岩心的变化规律具有差异性。将渤海稀油相渗岩心划分为稀油低渗固结岩心、稀油中高渗固结岩心、稀油疏松岩心三大类，建立各类岩心残余油饱和度预判图版。应用预判图版能够在相渗实验前和已知常规孔渗数据的条件下，根据不同油水黏度比的图版预判残余油饱和度的合理值范围，以指导后续相渗实验数据的质量控制。

 Based on the experiment data and the two main control factors of relative permeability parameters, fluid property and petrophysics, a set of application charts which show the rules how irreducible oil saturation vary with petrophysics in the same class of oil/water viscosity ratio were analyzed. The research shows that the breakpoint of the irreducible oil saturation occurs and varies with fluid property with the increase of porosity and permeability. The three kinds of application charts, low permeability consolidated core of diluted oil, convention consolidated core of diluted oil and loose core of diluted oil, could guide the quality control of relative permeability experiment data and prejudge the reasonable value range of irreducible oil saturation.

10.6056/dkyqt201603025