Aqueous gel-forming compositions are prepared by reacting for 1-10 hours at 50-95°C, melamine, formaldehyde and a sulfurous acid salt with the optional addition of a gel-modifying agent and/or a gelling agent which is added to the composition immediately prior to use. These compositions are useful in the recovery of hydrocarbons from hydrocarbon-bearing subterranean reservoirs.
三聚氰胺、
甲醛和
亚硫酸盐在 50-95°C 的温度下反应 1-10 小时即可制备出
水凝胶成 型组合物,可选择添加凝胶改性剂和/或胶凝剂,使用前立即添加到组合物中。这些组合物适用于从含碳氢化合物的地下储层中回收碳氢化合物。