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Development of an cultivation in oil reservoir for microbial enhanved oil recovery

用于微生物强化采油的油藏培养方法的开发

基本信息

批准号：
09450381
负责人：
CHIDA Tadashi
金额：
$ 2.43万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450381/
关键词：
MEOR transport phenomena mathematical model oil reservoir growth clog

项目摘要

This study, which purpose is establishment of an culture method in oil reservoir for microbial enhanced oil recovery (MEOR), focused on transport phenomena of nutrients and bacteria in porous media. In this study, to investigate these phenomena, there were carried out some experiments and mathematical analyses.A two-dimensional packed-bed with glass beads was made for laboratory experiments of nutrients and bacteria transport phenomena. KC1 solution and lactic acid bacteria (Lactobacillus casei, ATCC15883) were applied to replicate nutrients and useful bacteria for MEOR, The experimental results by KCl solution injections into the bed showed good agreements with the calculations of the two-dimensional mathematical model considering the conversion, the mixing diffusion and the buoyancy force due to differences of the solution concentration. At the case of the results by the bacteria solution, which grew until static phase, into the bed, it was confirmed the clog phenomena which pores in the bed were plugged by bacteria. So, at the mathematical model, there were considered more parameters that indicated clog and declog phenomena in addition to the parameters of the conversion, the mixing diffusion and the buoyancy force. The calculation results showed good agreements with the experimental results.Using the mathematical model, the cases studies were carried out that the distributions of permeability were changed in oil reservoir. At the calculations the permeability was given by Kozeny-Carman's equation. The results of simulation showed that the transport phenomena of nutrients and bacteria were very different with the little change of permeability distributions.

以建立微生物采油油藏培养方法为目的，研究了微生物在多孔介质中的运移规律。为此，本文通过实验和数学分析的方法，在二维填充床中加入玻璃珠，对营养盐和细菌的迁移现象进行了实验研究。采用KCl溶液和乳酸菌（Lactobacillus casei，ATCC 15883）模拟微生物采油的营养盐和有益菌，实验结果与考虑转化率、混合扩散和溶液浓度差异引起的浮力的二维数学模型计算结果吻合较好。在由生长至静止阶段的细菌溶液进入床的结果的情况下，证实了床中的孔隙被细菌堵塞的堵塞现象。因此，在数学模型中，除了考虑转换、混合扩散和浮力等参数外，还考虑了更多的反映堵塞和解堵现象的参数。利用该数学模型，对油藏渗透率分布发生变化的情况进行了实例研究。在计算时，渗透率由Kozeny-Carman方程给出。模拟结果表明，在渗透率分布变化不大的情况下，营养盐和细菌的迁移现象有很大的不同。