| abstract |
The invention provides for the use of a copolymer, comprisingn a) 0.1 to 10 mol-%, based on the weight of the copolymer, of structural units derived from vinylphosphonic acid or of a salt thereof, b) 40 to 80 mol-%, based on the weight of the copolymer, of structural units derived from compounds of the formula (1) nn n n n n n n n n n c) 1 to 50 mol-%, based on the weight of the copolymer, of structural units derived from compounds of the formula (5) n n n n n n n n n n n n n n in which X is OH or NR 3 R 4 , and R 3 and R 4 , independently of one another, are H or C 1 -C 4 -alkyl,n nfor the inhibition and/or dispersion of inorganic sulphide scales, and for a process for the inhibition and/or dispersion of inorganic sulphide scales, the process comprising adding to water being within an oil or gas containing formation said copolymer. |