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, Wire stripping machine 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 machine for pellets, rock porosity increases, thereby improving oil production.