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胶态分散凝胶（ＣＤＧ）是由低浓度的部分水解聚丙烯酰胺（ＨＰＡＭ）和柠檬酸铝（交联剂）形成的，聚丙烯酰胺和交联剂中铝的配比为２０∶１．分别研究了ＣＤＧ体系和不加交联剂的ＨＰＡＭ溶液在填充砂中的流动阻力以及ＨＰＡＭ的相对分子质量、填充砂的粒度对ＣＤＧ体系在填充砂中流动性的影响。研究结果表明，不加交联剂的ＨＰＡＭ溶液在填充砂管中的流动阻力略有增加，而加交联剂的ＣＤＧ体系在填充砂管中的流动阻力大幅度增加。ＣＤＧ体系在粗砂中流动时，需流过６５Ｖｐ（孔隙体积）的溶液，才能使填充砂管的阻力系数大大增加；而要增加同样的阻力系数，细砂管只需流过２１Ｖｐ的溶液。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
Colloidal Dispersion Gel (CDG) is formed from low concentrations of partially hydrolyzed polyacrylamide (HPAM) and aluminum citrate (crosslinker) with a 20: 1 ratio of aluminum in the polyacrylamide to the crosslinker. The flow resistance of CDG system and HPAM solution without cross-linking agent in filled sand and the relative molecular mass of HPAM and the particle size of filled sand on the fluidity of CDG system in filled sand were studied. The results show that the flow resistance of the HPAM solution without cross-linking agent in the filled sand tube slightly increases, while the flow resistance of the CDG plus cross-linking agent in the filled sand tube increases significantly. When flowing in grit, the CDG system needs a solution of 65 Vp (pore volume) to increase the drag coefficient of the filled sand tube. To increase the same drag coefficient, the sand tube needs to flow only 21 Vp of solution. When the relative molecular mass of HPAM is high, the flow resistance of the formed CDG system in the filled sand tube increases more rapidly than that of HPAM, which has a relatively small molecular weight