Improved process for assisted oil recovery with preservation of polymers by adding sacrificial compounds

摘要

The method comprises adding, to a solution including active polymers, an additive comprising a sacrificial polymer whose mechanical degradation is preferential with respect to the active polymers to limit the mechanical degradation of the active polymers. The sacrificial polymer is selected according to the ability of the sacrificial polymer to preserve the active polymer from mechanical degradation quantified by the gain (higher than 30%) on the degradation percentage of the active polymer, where the gain is defined by an equation that is expressed as given in the specification. The method comprises adding, to a solution including active polymers, an additive comprising a sacrificial polymer whose mechanical degradation is preferential with respect to the active polymers to limit the mechanical degradation of the active polymers. The sacrificial polymer is selected according to the ability of the sacrificial polymer to preserve the active polymer from mechanical degradation quantified by the gain (higher than 30%) on the degradation percentage of the active polymer, where the gain is defined by an equation that is expressed as given in the specification. The proportion of the sacrificial polymer is 5-500 ppm by weight in relation to an aqueous phase. The sacrificial polymer has higher molecular mass, same or different nature in relation to the active polymers, and bonds that are fragile than the active polymers. The molecular mass of the sacrificial polymer is 1.5 times higher than the active polymers.