Polyacrylamide (PAM) is a linear polymer with the chemical formula (C3H5NO)n。 It is a hard glassy solid at room temperature, and the products include glue, latex and white powder, translucent beads and flakes. Good thermal stability. It can be dissolved in water in any proportion, and the aqueous solution is a uniform and transparent liquid. After long-term storage, the viscosity of the solution will decrease due to the slow degradation of the polymer, especially when the storage and transportation conditions are poor. As a lubricant, suspension agent, clay stabilizer, oil displacement agent, water loss reduction agent and thickener, polyacrylamide has been widely used in drilling, acidification, fracturing, water plugging, cementing, secondary and tertiary oil recovery, and is an extremely important oilfield chemical.