Aqueous sulfomethylated melamine gel-forming compositions.

摘要

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.