Method for improving salt resistance of polyacrylamide through biological regulation

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for improving temperature resistance and salt resistance of polyacrylamide through biological regulation and control. The method comprises the following steps: screening alkali-producing microorganisms, wherein screening parameters comprise bacterium concentration and pH value; screening an activator system, wherein the screening parameter is calcium ion decreasing amplitude; a composite system injection process is determined, the composite system injection process comprises an injection mode and a biological regulation and control system and polyacrylamide injection proportion, and the biological regulation and control system is composed of alkali-producing microorganisms and an activator system. According to the method, the viscosity of the polymer under the high-salt condition is effectively guaranteed, the purpose of improving the displacement effect of the high-salt oil reservoir polymer is achieve