低渗透储层非线性渗流模型研究  

Study on non-linear seepage flow model for low-permeability reservoir

作　　者：时宇[1,2] 杨正明[1,3,2] 黄延章[1,2] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]中国石油大学石油天然气工程学院,北京102249

出　　处：《石油学报》2009年第5期731-734,共4页Acta Petrolei Sinica

基　　金：国家重点基础研究发展规划(973)项目(2007CB209500);中国石油天然气股份有限公司科技项目(08-02A-02-02)联合资助

摘　　要：依据毛管模型及边界层理论,建立了非线性渗流模型。同时利用恒速压汞实验确定了大庆低渗透油田喉道分布密度函数。应用非线性渗流模型与喉道密度分布函数,对低渗透储层中产生非线性渗流的压力梯度区域进行了准确界定,并对影响非线性渗流的因素进行了定量分析。结果表明,在非线性渗流过程中储层渗透率与启动压力梯度均为变量,二者是产生非线性渗流的主要因素。其中,渗透率的影响程度较大,但产生影响的范围较窄;而启动压力梯度的影响程度相对较小,而影响范围较大。On the basis of the classic capillary model and boundary layer theory,the non-linear seepage flow model for the low-permeability reservoir was established.The density function of throat distribution in Daqing low-permeability reservoir was determined by the constant-rate mercury injection experiment.The non-linear seepage flow model and the throat density distribution function were used to calculate the pressure gradient range of non-linear seepage flow in the low-permeability reservoir.The factors impacting the non-linear seepage flow were also quantitatively analyzed. The results showed that the co-operation of permeability and startup pressure gradient resulted in the non linear seepage flow, The permeability has greater impact degree and smaller impact range than the startup pressure.

关 键 词：低渗透油藏 非线性渗流 恒速压汞实验 启动压力梯度 喉道密度分布函数 渗透率 渗流模型 

分 类 号：TE348[石油与天然气工程—油气田开发工程]