低渗透油藏启动压力梯度实验研究  

Experimental Study of Low-Permeability Reservoir Starting Pressure Gradient

作　　者：姜桂芹[1] 程时清[1] 

机构地区：[1]中国石油大学北京石油工程教育部重点实验室

出　　处：《低渗透油气田》2009年第3期80-82,共3页

摘　　要：针对单相流体启动压力梯度的产生机理和对渗流规律的影响问题，通过稳态“压差-流量”测定启动压力梯度法，分别用模拟油、模拟地层水和蒸馏水对我国某油田37块典型低渗岩心进行驱替实验．得到了单相渗流的启动压力梯虔值，分析了启动压力梯度的变化规律。，物理模拟表明：不鼠渗流介质l碘l得的启动压力梯皮与渗透率均戍幂函数关系；随着渗透率的增大，启动压力梯度逐渐减小，当增大到一定值后变化平稳，油层渗透率对启动压力梯度的大小影响非常显著；渗流介质的黏度越大，启动压力越大。The single-phase fluid pressure gradient to start the generation mechanism and the impact of laws on the seepage through the steady-state “Pressure - Flow” Determination of the starting pressure gradient method, were used to model oil, simulated formation water and distilled water in an oil field in China 37 block for a typical low-permeability core displacement experiments have been the start of single-phase flow pressure gradient values, analysis of start-up pressure gradient was studied. Physical simulation shows that： different media, the measured flow start-up pressure gradient and permeability are into the power function relationship; as the penetration increases, the starting pressure gradient gradually decreases, while increases to a certain value changes in a smooth, reservoir permeability The size of the starting pressure gradient effect is very significant; seepage viscosity of the medium the greater the greater the start-up pressure.

关 键 词：低渗透油藏:启动压力梯度 幂函数关系式 渗流介质 

分 类 号：TE312[石油与天然气工程—油气田开发工程]