基于流动实验和动态阻力特征的致密油藏非线性渗流表征  

Characterization of nonlinear percolation in tight oil reservoirs based on flow experiments and dynamic resistance characteristics

作　　者：曲全工[1] QU Quangong(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2021年第5期94-99,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“渤海湾盆地济阳坳陷致密油开发示范工程”(2017ZX05072)。

摘　　要：针对致密油藏,在流动实验和理论分析的基础上,建立了致密油藏非线性渗流表征新方法,该方法基于致密油藏渗流过程中的动态阻力梯度特征,结合储层岩心流动实验,获得启动压力梯度、拟启动压力梯度和液测渗透率等3个表征参数,从而建立新的致密油藏非线性渗流表征模型——动态阻力梯度模型,并通过单井尺度进行了验证。研究结果表明:随着驱替压力的增加,动态阻力梯度逐渐增加且与驱替压力梯度的对数呈线性关系;非线性渗流数学表征与启动压力梯度、拟启动压力梯度和液测渗透率3个参数相关,并以这3个参数为基础建立了基于流动实验的致密油藏非线性渗流表征。从油藏应用的角度表明该非线性渗流表征模型的精度要高于达西模型和拟启动压力梯度模型。For tight oil reservoirs,based on flow experiments and theoretical analysis,a new method for characterizing nonlinear percolation in tight oil reservoirs percolationwas developed.Based on the characteristics of dynamic resistance gradient in the percolation process of tight oil reservoirspercolation,this method adopted the flow experiment with reservoir cores to obtain three characterization parameters including starting pressure gradient,pseudo-starting pressure gradient,and measured liquid permeability.Thus,a new characterization model of nonlinear percolation in tight oil reservoirspercolation,i.e.,dynamic resistance gradient model,was built and verified on a single-well scale.The research results show that with the increase in displacement pressure,the dynamic resistance gradient gradually increases and is linearly correlated to the logarithm of the displacement pressure gradient.The mathematical characterization of nonlinear percolation is related to three parameters,namely starting pressure gradient,pseudo-starting pressure gradient,and measured liquid permeability.According to the three parameters,the characterization of nonlinear percolation in tight oil reservoirs was established based on flow experiments.From the perspective of reservoir application,the proposed characterization model is more accurate than the Darcy model and the pseudo-starting pressure gradient model.

关 键 词：非线性渗流 流动实验 动态阻力梯度 启动压力梯度 致密油藏 

分 类 号：TE312[石油与天然气工程—油气田开发工程]