The flow resistence of the CDG formed by HPAM with larger molecular weight in the sandpack increased more quickly than that of the CDG by HPAM with smaller molecular weight. CDG is able to increase the flow resistance in the sandpack effectively.

• HPAM的相对分子质量大时，所形成的CDG体系在填充砂管中的流动阻力比相对分子质量小的HPAM增加更快