Abstract: The invention provides for the use of a copolymer, comprising 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) c) 1 to 50 mol-%, based on the weight of the copolymer, of structural units derived from compounds of the formula (5) in which X is OH or NR3R4, and R3 and R4, independently of one another, are H or C1-C4-alkyl, for 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.

Abstract: The invention provides for the use of a copolymer, comprising 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) c) 1 to 50 mol-%, based on the weight of the copolymer, of structural units derived from compounds of the formula (5) ?in which X is OH or NR3R4, and R3 and R4, independently of one another, are H or C1-C4-alkyl, for 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.

Abstract: This invention relates to compounds of formulae (1a) and (1b) wherein R means H or C1- to C6-alkyl, X is a structural unit selected from the formulae ?wherein m and k mean independently from each other a number from 1 to 12 for (4) and (5) and from 1 to 11 for (6), Y is a structural unit selected from the formulae wherein a, b independently from each other are integers from 1 to 10 R means hydrogen or C1- to C6-alkyl R2 means an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms R3, R4, R5, R6 independently from each other mean an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms, Z means a cation, and n means an integer being two or higher.

Abstract: The invention provides for the use of a copolymer, comprising 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) c) 1 to 50 mol-%, based on the weight of the copolymer, of structural units derived from compounds of the formula (5) in which X is OH or NR3R4, and R3 and R4, independently of one another, are H or C1-C4-alkyl, for 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.

Abstract: This invention relates to compounds of formulae (1a) and (1b) wherein R means H or C1- to C6-alkyl, X is a structural unit selected from the formulae wherein m and k mean independently from each other a number from 1 to 12 for (4) and (5) and from 1 to 11 for (6), Y is a structural unit selected from the formulae wherein a, b independently from each other are integers from 1 to 10 R means hydrogen or C1- to C6-alkyl R2 means an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms R3, R4, R5, R6 independently from each other mean an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms, Z means a cation, and n means an integer being two or higher.