Anionic polyacrylamide APAM flooding mechanism

Anionic polyacrylamide amine has high water solubility and high molecular chain viscosity, which can improve the mobility ratio of displacement fluid, increase displacement efficiency and sweep volume, and increase oil recovery.

1. APAM can reduce the oil-water mobility ratio of the petroleum layer, change the split flow curve, reduce the water cut of the oil produced, and increase the oil production speed.

2. Anionic polyacrylamide amine APAM improves the viscous fingering phenomenon of water flooding in heterogeneous water planes, and improves the sweep efficiency of the plane range. In the vertical direction, using the high-viscosity properties of anionic polyacrylamide is the subsequent water flooding from the high-permeability layer to the low-permeability layer, increasing the thickness of water absorption and expanding the vertical sweep efficiency.

3. The molecular chain of anionic polyacrylamide is hydrophilic. When APAM polymer passes through the porous medium, it uses its adsorption and mechanical trapping effect to change the permeability of the void, but it has little effect on the permeability of the oil phase and does not block water. Oil blocking.

4. The anionic polyacrylamide polymer solution improves the viscoelasticity of oil-water excuses, making oil droplets or oil films easy to deform, and can pass through various pores to improve the microscopic oil displacement effect and increase the oil recovery efficiency.

The molecular weight of the anionic polyacrylamide APAM used in oilfield recovery is generally above 20 million to achieve a higher viscosity and better oil displacement effect.