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对淀粉与丙烯酰胺的接枝共聚反应进行了研究,确定了反应条件后,再加入硅酸钠-USC(成胶控制剂)溶液,反应10 h后最终形成了一种有机-无机复合凝胶。流变性实验结果表明,体系中加入硅酸钠后,其储能模量和耗损模量均大于原接枝体系。相同条件下,复合凝胶材料的柔量低于淀粉接枝体系,即其形变能力较差;随着温度的增加,复合凝胶的柔量降低,体系的形变能力随温度变化较敏感。封堵实验结果表明,不加硅酸钠的接枝共聚物对填砂管的封堵率达到97%,而复合凝胶材料的封堵率达到99.9%。这是由于硅酸钠凝胶的存在,增加了凝胶自身强度,生成的凝胶与岩石颗粒有一定的粘接力,从而明显提高了体系的封堵强度。
The graft copolymerization of starch and acrylamide was studied. After the reaction conditions were confirmed, a solution of sodium silicate-USC (gel forming agent) was added. After reaction for 10 h, an organic-inorganic composite gel . The results of rheological experiments show that the storage modulus and loss modulus of sodium silicate are higher than those of the original grafted system. Under the same conditions, the compliance of the composite gel material is lower than that of the starch graft system, that is, its deformability is poor; as the temperature increases, the compliance of the composite gel decreases, and the deformation ability of the composite gel becomes more sensitive to temperature changes. The results of plugging experiments showed that the plugging rate of the sand filled tube without adding sodium silicate reached 97%, while the plugging rate of the composite gel material reached 99.9%. This is due to the presence of sodium silicate gel, which increases the self-strength of the gel, resulting in a certain degree of adhesion between the gel and the rock particles, thereby significantly improving the blockade strength of the system.