摘要
微生物能够在油层中运移是应用微生物提高采收率的重要原因 ,本文介绍了微生物在多孔介质中渗流的实验研究和数学模型建立。实验研究表明 ,微生物的柔性变形性和动力定向性 ,使微生物具有很强的通过多孔介质喉道能力 ,可用于 30× 10 -3 μm2 左右低渗油田采油 ;微生物渗流时 ,可被岩石吸附并具有对流扩散特征。在对流扩散特征基础上 ,建立了包含吸附的一维单向和径向微生物渗流数学模型 ,并得到了解析解。通过对实验曲线的拟合 ,得到了微生物在多孔介质中的对流扩散系数和最大吸附常数 ;计算表明 ,微生物渗流时浓度下降很快 ,有效作用范围很小 ,因此微生物在油藏条件下有快速的繁殖能力十分必要。
Microbe can transport in oil reservoirs, this is an importance reason that microbe has been used to improve oil recovery. The experimental and theoretical research on microbial seepage was conducted and reported here firstly in China. The experimental results show, that the microbe has strong transport ability in porous media, and the probable reason is that strain can change its shape and it has the tendency of passing through the narrow path. So the microbe can be used in reservoirs with the permeability equal to or over 0.03 darcy. Based on the dispersion and absorb of bacteria, a new mathematical model for transport was established. This model can be used to calculate the distribution of microbial concentration in formation. The results of calculation also show that the concentration decreases quickly and the effective radius is small, therefore to make the bacteria reproduce faster, pour properly nutrition is necessary.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2002年第2期148-155,共8页
Chinese Journal of Hydrodynamics
关键词
微生物
采收率
渗流
扩散吸附
多孔介质
microbe
transport
dispersion
absorption
mathematical model
