超低渗单相渗流不存在启动压力梯度的实验  

Experiment on Saturated flow in Ultra-Low Permeability Reservoirs without Threshold Pressure Gradient

作　　者：谢全[1] 何顺利[1] 焦春艳[1] 朱华银 吕志凯[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油天然气成藏与开发重点实验室,河北廊坊065007

出　　处：《新疆石油地质》2011年第2期173-175,共3页Xinjiang Petroleum Geology

基　　金：国家重大科技专项(2009ZX05009-004)

摘　　要：针对国内外超低渗饱和、非饱和渗流流体启动压力梯度研究状况,利用美国岩心公司AFS300TM全自动岩心驱替系统,对鄂尔多斯盆地三叠系超低渗露头全直径岩心,采用非稳态法研究岩心上、下游端压力变化,分析单相标准盐水、煤油和原油渗流的启动压力梯度特征。实验结果表明,饱和渗流流体(标准盐水、煤油和原油)在超低渗介质中渗流没有明显的启动压力梯度。低渗岩心孔隙表面与标准盐水、煤油和原油的分子作用力不会导致启动压力梯度。According to the fundamental differences about the threshold pressure gradient existing in ultra-low permeability reservoirs given by domestic and foreign researchers,this paper proposes unsteady approach to test the threshold pressure gradient of saturated and unsaturated flow in the lab using the outcrop full-hole core with ultralow permeability of the Triassic in Ordos basin by means of fully-automatic flooding system of AFS300TM provided by the Core Lab in U.S.A.The threshold pressure gradient in the saturated flow has been analyzed with the investigation of pressure variation from downstream and upstream of the core holder.The experimental results indicate that the threshold pressure gradient is not existent in terms of flowing of brine,kerosene and crude oil,and the interaction between the molecular of the fluid and the porous surface of the core plugs will not cause the threshold pressure gradient.

关 键 词：超低渗 饱和渗流流体 非稳态法 启动压力梯度 

分 类 号：TE125[石油与天然气工程—油气勘探]