内源微生物提高原油采收率物理模拟驱油实验研究

Experimental study on endogenous micro-organism flooding

在分析国外内源微生物物理模拟驱油实验的基础上 ,采用单 12区块原油和原生水模拟地层条件 ,进行了内源微生物物理模拟驱油实验研究 .对残余油采收率、系统压力、醋酸根含量、生物气产量及组成进行了检测 .结果表明 ,采用空气辅助 (液气比 1∶10 )激活好氧微生物 ,经过 36d的培养驱替 ,残余油采收率提高了 4 .7% ;依赖于整个油层生态系统的改善 ,在激活的厌氧微生物的主导作用下 ,经过两轮次 77d的培养驱替 ,残余油采收率提高了 8.3% ;实验结果验证了注水油层中好氧微生物—厌氧微生物演替降解石油的两阶段生物过程 ,生物气中甲烷的含量随培养时间的增加而增加 ,最高达 74 .4 % ;而始终未检测出硫化氢 。

The mechanism of endogenous micro-organism flooding is analyzed from the point of view of ecology. Based on the review of a few physical simulation experiments abroad, the physical simulation experiment of endogenous micro-organism flooding is systemically studied. The results show that the physical simulation experiments of endogenous micro-organism flooding require much longer time and more treatment compared with those of exogenous micro-organism flooding; enhancing recovery factor by endogenous micro-organism flooding is the result of the synergy of the ecosystem of reservoir; one aerobic bacterium flooding cycle can drive out the remaining oil of 4.7%, and two anaerobic bacterium flooding cycles cumulatively drive out the oil remaining of 8.3%; the content of methane in biogas increases with the increase of culture time and it can reach to 74.45%; H_2S is not detected in the biogas, which shows that the generation of H_2S is effectively restrained by activation nutrition.