Patent ID: 8680028

Claim:
A process for the treatment of underground or nonunderground rock formations, oil or gas producing wells, water injection wells targeted at flushing hydrocarbon, oil or gas reservoirs, mine gas wells or gas storage wells, comprising injecting onto or into said rock formation, or into said well, a microgel obtained by diluting, in water, a self-invertible inverse latex or a self-invertible inverse microlatex, of a crosslinked polyelectrolyte, the polyelectrolyte obtained by copolymerization, in the presence of a crosslinking agent, of: (i) free, partially salified or completely salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid (AMPS), (ii) at least one cationic monomer selected from the group consisting of 2,N,N,N-tetramethyl-2-[(1-oxo-2-propenyl)amino]propanammonium chloride, N,N,N-trimethyl-3-[(1-oxo-2-propenyl)amino]propanammonium chloride, diallyldimethylammonium chloride, N,N,N-trimethyl-2-[(1-oxo-2-propenyl)]ethanammonium chloride, N,N,N-trimethyl-2-[(1-oxo-2-methyl-2-propenyl)]ethanammonium chloride and N,N,N-trimethyl-3-[(1-oxo-2-methyl-2-propenyl)amino]propanammonium chloride, and (iii) at least one neutral monomer selected from the group consisting of acrylamide, N,N-dimethylacrylamide, N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]propenamide and 2-hydroxyethyl acrylate.