Mechanism Of Microorganisms And Metabolites For Oil Recovery

Microbial enhanced oil recovery is result of enhancing the oil recovery by the interaction of the microorganisms and reservoirs. Currently, the mechanism of microbial enhanced oil recovery is inclined to be analyzed from the perspective of the physiology and biochemistry, namely the perceptual knowledge about what are the microorganisms, its metabolites and their effects can be acquired. However, about enhancing oil recovery by microorganisms and metabolites, the effect of each part can't be described quantitatively. So according to the microbial metabolism and the reservoir characteristics, the mechanisms of microbial enhanced oil recovery are comprehensively analyzed and then the ability of the microorganism and the metabolites enhanced oil recovery can be determined in the paper, which give full play to the effect of the microbial enhanced oil recovery.On the basis of the microbial metabolic regularity and the oil/water percolation mechanism, through comprehensive analysis of the composition and supply characteristics of the nutrients, the geology and fluid characteristics and migration rule of microorganisms in porous media, the microbial metabolite concentration and the pattern of the microbial retention and aggregation are researched using the law of conservation of mass and the laboratory experiment. And the oil displacement efficiency of the microbial metabolite was analyzed from the perspective of reservoirs.The study suggests that the microbial metabolite concentration is limited in reservoir, which is difficult to reach the chemical concentration and gas amount required by starting the retaining oil in chemical flooding and gas flooding; however the microorganisms have a tendency to stay in the porous media of the reservoir, which is beneficial to the profile control or deep profile control. Moreover, the microbial metabolite concentration besides the remaining oil has higher than elsewhere, which are significant for driving the remaining oil in the pore space. Because the massive amounts of the microorganisms carried by the water were retained near the remaining oil. In addition, it is more favorable to play the effect of the microbial enhanced oil recovery combining with the methods of the hydrodynamics in reservoir.