摘要
国内外许多实验表明,当储层渗透率低到一定程度后,其渗流特征不符合达西定律,即当驱动压力梯度较小时,流体不能流动,只有当驱动压力梯度达到一定值后,流体才开始流动。而低(特低)渗透油藏具有低孔、低渗的特点,因此具有较高的启动压力梯度[1],[2],即渗流呈"非线性"特征,在低(特低)渗透油藏井网部署中必须考虑该因素。低渗油藏油水渗流时启动压力现象的存在,使注采井距理论上存在一个最大值,结合单井产量公式,可以计算出给定注采压差条件下低渗油藏的最大注采井距,从而为合理注采井网的部署提供依据。为此,本文基于低渗透油藏的渗流机理的分析和研究,推导出了适合低渗透油藏的极限注采井距的新的方法。
Many domestic and foreign experiments showed that when permeability of reservoir was low to a certain degree,its flow characteristics was incompatible with Darcy 's law,that is,when the driving pressure gradient is small,fluid can not flow only when the driving pressure gradient up to a certain value,fluid flow begin.The low(ultra-low) permeability reservoirs with low po-rosity has high start-up pressure gradient,its percolation feature is a 'nonlinear',so,the low(ultra-low) permeability oil well network deployment must take into account the factors.Combina-tion with single well production formula,the largest producer-in-jector spacing can be calculated under conditions of given injection and production pressure difference in low permeability reservoir.Therefore,based on the analysis and research of percolation mech-anism in low permeability reservoir,the new approach for determi-ning limited producer - injector spacing in low permeability reser-voir has been derived.
出处
《钻采工艺》
CAS
北大核心
2008年第5期47-48,167,共2页
Drilling & Production Technology
关键词
低渗油藏
渗流
启动压力梯度
极限注采井距
low permeability reservoir,percolation,starting pressure gradient,limited producer-injector spacing
