低渗透多孔介质单相流体非线性渗流及计算方法  

Non-linear percolation and its computational method of single phase fluid in low permeability porous medium

作　　者：沈瑞[1] 熊伟[1] 高树生[1] 胡志明[1] 关克明[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]长庆油田分公司第三采油厂,宁夏银川750006

出　　处：《武汉工业学院学报》2009年第3期33-35,共3页Journal of Wuhan Polytechnic University

基　　金：中国石油天然气股份有限公司科研资助项目(06-02A-02-01)

摘　　要：在实验的基础上,提出了随压力梯度变化的渗流能力修正因子,并以此对达西公式进行修正,推导出低渗透多孔介质单相流体渗流的控制方程,并用有限差分方法进行求解。计算表明,在生产井定产的情况下,用该方法计算得到的井底压力比相同条件下达西渗流计算所得的井底压力要小。随着模拟时间的增加,压力消耗主要集中在井底附近,远离井的地区压力幅度下降很小,与实际多孔介质的特点相符。In order to describe the percolation law in low permeability reservoir, the correction factor of percolation ability which varies with the pressure gradient is proposed in this paper on the basis of experiment. And the Darcy＇s formula is corrected by the factor. The control equation of fluid percolating in low permeability porous medium is developed and its numerical solution technique is studied. The result shows the bottom hole flowing pressure calculated by this method is smaller than the one by Darcy method. The pressure acutely decreases near the bottom hole, while it smoothly changes far from the well. The phenomenon matches the actual flow in low permeability porous media.

关 键 词：低渗透 非线性渗流 数值模拟 

分 类 号：TE311[石油与天然气工程—油气田开发工程]