microbes can change the flooding environment

(1) biosurfactants. Microbial activity agent component mainly palmitic acid, heptadecanoic acid and Food dehydrator, it will reduce pressure on oil-water interface, reducing the capillary force of water flooding, improve flooding capillary number. Meanwhile biosurfactants will change reservoir rock wettability from hydrophilic lipophilic become so absorbed on the surface of the oil slick off the rock, reservoir residual oil saturation decreased, thereby increasing oil recovery. (2) bio-gas. Most microorganisms in the metabolic process will produce gases such as carbon dioxide, hydrogen, methane, etc. These gases are part of the pressurized oil to the oil and reduce viscosity, improve oil flow capacity. Dissolution of carbonate rocks, increasing penetration of the oil expansion four volume increases, help drive out of oil equipment, to increase production. Sensitizing effect while the false bubble will increase the flow resistance, improve water waves and volume injected. (3) acids and organic solvents. Acid is mainly produced by microorganisms is a relatively low molecular weight organic acids (formic acid, propionic acid), there are some inorganic acids (sulfuric acid), which can dissolve carbonates, on the one hand to increase the porosity and improve the permeability; hand, release carbon dioxide improve reservoir pressure and reduce oil viscosity, improve oil flow capacity. Alcohols produced, organic esters and other organic solvents may change the surface properties of rock physical properties and oil, the adsorption on the porous rock surface oil is released and taken out of the ground easily. At the same time, also generate two unknown microorganism alcohols, these are micro-organisms during the fermentation metabolites oil, which help to improve the oil viscosity, similar to mild acidification, rock porosity increases, thereby improving oil production.