应用微观透明模型研究微生物驱油机理  

The Oil-Displacing Mechanisms at Pore Level in MEOR as Revealed by Using Transparent Micromodel

作　　者：冯庆贤[1] 邰庐山[1] 滕克孟[1] 牟伯中[1] 杨怀军[1] 倪方天[1] 

机构地区：[1]中国石油大港油田油气勘探开发技术研究中心,天津大港300280

出　　处：《油田化学》2001年第3期260-263,共4页Oilfield Chemistry

基　　金：1 999年国家自然科学基金资助项目"微生物驱油机理及数值模拟研究"(批号 5 99740 1 4)

摘　　要：在模拟大港油田官 69断块油藏条件下 ,在微观透明仿真蚀刻模型上进行了该断块候选嗜热驱油菌种的驱油实验 ,在孔隙级别考察了微生物驱油机理。模型孔隙最大直径为 80 0 μm ,最小直径为 8μm ,渗透率 0 .3— 0 .6μm2 。由实验观测得到该菌液的驱油机理如下 :①乳化、携带并启动剩余油 ;②剥离油膜 ;③不动生物气的Jamin效应导致液流转向 ,可动生物气泡与粘附的细小油滴一起流动。在非均质透明薄板夹砂模型上进行菌液驱油 ,观察到显著的重力作用 (菌液下移 ,气体上移 )。The Oil displacing mechanisms at pore level involved in MEOR under the conditions of reservoir at Fault Block Guan 69 in Dagang are investigated by using a thermophilic bacterial species as a candidate for Guan 69 microbial flood programs on transparent etched micromodels. These pore level models are of largest and smallest pore diameters 800 and 8 μm, respectively, and of permeability 0.3-0.6 μm 2 . The temperature of bacteria injection is 30℃ and of cultivation 73℃(the reservoir formation temperature). The oil displacing mechanisms by the bacterial species revealed on the basis of the experimental observations are as follows:① emulsification, carrying and mobilization of the residual oil; ②dibonding and peeling of the adhered oil film;③Jamins effect of stational biologically generated gas leading to fluid diverting and flowing gas bubbles with ting oil droplets. Besides, the notable gravitational displacement of bacterial culture downwards and biological gas upwards is observed in the experiments on thin plate unhomogeneous sand packs.

关 键 词：微生物驱油 MEOR 嗜热菌种 微观透明模型 驱油机理 孔隙级 大港官69断块油藏 

分 类 号：TE357.9[石油与天然气工程—油气田开发工程]