碳酸盐岩油藏线性复合试井分析模型及其应用

Linear CompositeWell Test Analysis Model of Carbonate Reservoir and Its Application

针对多个区域表现为条带状沉积特征的北特鲁瓦碳酸盐岩油田的渗流规律难以准确描述问题,建立了一种碳酸盐岩油藏线性复合试井分析模型。利用点源函数理论、傅里叶变换等方法,求解得到内外区都为均质的线性复合井底压力解,并引入一种均质油藏压力解与双重介质油藏压力解的简单转换方法,得到碳酸盐岩油藏线性复合井底压力解。典型曲线分为9个主要的流动段,并进行了参数敏感性分析。将研究成果应用于北特鲁瓦碳酸盐岩油田某区块的实例井,分析试井曲线并对其进行解释,表明该井处于内区与外区物性差别较大的线性复合区域,解释参数与已有的生产资料基本一致。该模型可以较为准确地描述具有条带状沉积特征的碳酸盐岩油藏的渗流规律,可为该类油藏的试井分析提供一定的理论依据。

Many areas of North Truva carbonate oil field are characterized by banded sedimentation,which is difficult to accurately describe their seepage law.Therefore,a linear composite well test analysis model for carbonate reservoir was established.Using point source function theory,Fourier transform and other methods,the linear composite bottom hole pressure solution of oil wells with homogeneous reservoirs in both inner and outer areas is obtained,and a simple conversion method between homogeneous reservoir pressure solution and dual medium reservoir pressure solution is introduced to obtain the linear composite bottom hole pressure solution of carbonate reservoir.The typical well test curves are divided into 9 main flow sections,and the parameter sensitivity of them is analyzed.The research results are applied to an example well in a block of North Truva carbonate oil field,the well test curve is analyzed and interpreted,which shows that the well is in a linear composite area with great physical properties difference between the inner area and the outer area,and the interpretation parameters are basically consistent with the existing production data.The model can accurately describe the seepage law of carbonate reservoir with banded sedimentary characteristics,and the research results can provide a certain theoretical basis for well test analysis of this kind of reservoir.