A method and composition for the selective water - permeability reduction in warm water and salty carbon material reservoirs.

摘要

Process and composition for the selective reduction of the water permeability in an underground formation producing oil and/or gas. …??The composition injected into the formation comprises water, at least one water-soluble aldehyde compound in a weight concentration of 180 to 20,000 ppm and at least one nonionic polysaccharide in a weight concentration of 200 to 5,000 ppm, the concentration of aldehyde compound being higher than the concentration of polysaccharide. It can be employed at the water injection well or at the hydrocarbon production well. …??Application to the assisted recovery of hydrocarbons.