Copolymers for decreasing or standardization of water inflow useful in petroleum and natural gas boreholes

摘要

Water soluble copolymers based on acrylamidoalkylenesulfonic acids(I), N-vinylamides, acrylamides (II) and vinylphosphonic acids crosslinked during use show high adsorption on rock deposits, elastic elongation/compression behavior, and special stability towards salts in deposits. Water soluble copolymers based on acrylamidoalkylenesulfonic acids(I), N-vinylamides, acrylamides (II) and vinylphosphonic acids crosslinked during use show high adsorption on rock deposits, elastic elongation/compression behavior, and special stability towards salts in deposits. They can be used at very high temperatures, which can be controlled by the I to II ratio, and that increase in the amount of I gives high stability to the crosslinked gel. The copolymers contain (wt.%): (A) structural units (40-98) of formula (I): R1 = H or Me; R2 = 2-10C alkylene, Me, ammonium, or alkali metal ion; (B) structural units (0.1-58) of formula (II):, (C) structural units (0.1-10) of formula (III): R3 and R4 = H, Me, Et, or R3 and R4 together = propylene, which on inclusion of the residue: a pyrrolidone residue, or a pentamethylene group results in formation of a caprolactam residue, and (D) structural units (0.1-0) of formula (IV):, and simultaneously with the copolymer or in the formation or deposition (sic) a crosslinker for the copolymer is introduced, which includes at least Zr, Cr, Ti, or Al compounds, and finally the petroleum and/or natural gas is extracted by drilling. Independent claims are included for the following: (1) a copolymer with the structural units (A) to (D); (2) a composition containing the copolymer and also a Ti, Cr, Zr, or Al compound.