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在前篇报告中；沙袋中注入9A菌株的实验可以回收注水后30％的残余原油。这种回收方法在其余9种微生物试验中效果最好。但是，提高回收率的机理并不详细。本文报告了一些回收机理。注入分两步进行：①注水；②用相同的沙袋注入微生物；能够在注水后使油再饱和。两个试验程序都建立在前文提出的思想上。每次试验都记录下注水压力、注水和采油的数据，并进行比较以研究原油回收机理。应用菌株9A的产油／注水比率比注水采油的产油／注水比率高5倍，并能缩短采油周期。另外，菌株成长释放压力后产出原油。驱油效率提高的一个原因是气体代谢物提高了驱油能量。但下一个阶段的驱油可能由一些综合因素造成。估计一个主要因素是产生的气体和代谢物在多孔介质中产生泡沫。这些泡沫防止了早期的水的突破。
In the previous report, an experiment in which 9A strain was injected into the sandbags recovered 30% of the residual crude oil after water injection. This recovery method works best in the remaining nine microbial tests. However, the mechanism for increasing the recovery rate is not detailed. This article reports some recovery mechanisms. The injection is carried out in two steps: ① water injection; ② microbial injection with the same sandbags; and saturation of the oil after water injection. Both experimental procedures are based on the ideas presented earlier. The water injection pressure, water injection and production data were recorded for each test and compared to investigate the crude oil recovery mechanism. The yield / water ratio of strain 9A was 5 times higher than that of waterflooding and shortened the oil recovery cycle. In addition, the strain grows to release crude oil after releasing pressure. One of the reasons why oil displacement efficiency is improved is that gas metabolites increase the displacement energy. But the next stage of oil displacement may be caused by some combination of factors. It is estimated that one of the main factors is the generation of bubbles of gas and metabolites in the porous medium. These foams prevent the early breakthrough of water.