压敏储层渗透率分布规律研究  

Study on permeability distribution in pressure-sensitive reservoirs

作　　者：高宪[1] 王晓冬[1] 李敬函[2] 汪艳勇[2] 

机构地区：[1]中国地质大学,北京100083 [2]中油大庆油田有限责任公司,黑龙江大庆163453

出　　处：《特种油气藏》2012年第1期88-91,139-140,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"致密砂岩气有效开发评价技术"(2011ZX05013-022)

摘　　要：通过定义压敏油藏的无量纲变异系数,得到油藏渗透率变化的控制方程。在采用零维近似解的基础上,结合Laplace变换和Stehfest数值反演求解了无限大边界、定压边界和封闭边界3种外边界油藏单井生产的渗透率变化模型,并预测了这3种模型的渗透率变化趋势。结果表明,在油藏压力下降的同时渗透率会明显下降;随着压力不断减小,压力下降对渗透率变化的影响也逐渐减弱。而不同的油藏外边界会使渗透率呈现出不同的变化规律。A governing equation of permeability variation is established by defining dimensionless variation coefficient for pressure-sensitive reservoirs.A permeability variation model of single well production with infinite boundary,constant pressure boundary and sealed boundary is solved on the basis of zero-dimensional approximate solution combining with Laplace transformation and Stehfest numerical inversion,and the trends of permeability variation of the 3 boundaries are predicted.The results indicate that reservoir permeability decreases along with the decline of reservoir pressure;as the continuous decline of reservoir pressure,the impact of pressure drop on permeability becomes less prominent;and different reservoir boundaries may lead to different permeability variation.

关 键 词：压敏储层 非稳态渗流 渗透率变化 无限大边界 定压边界 封闭边界 

分 类 号：TE312[石油与天然气工程—油气田开发工程]