| 主权项 |
1. A method of inhibiting formation of calcium salts in an aqueous composition comprising metal ions, comprising:
mixing an aqueous composition comprising calcium ions with a fluid treatment system comprising: (a) at least one material comprising (1) at least one carboxylic acid functional group and (2) at least one sulfur-containing group selected from the group consisting of sulfonyl functional groups, sulfonate functional groups, and mixtures thereof, wherein the material (a) has a weight average molecular weight ranging from about 500 to about 30,000 grams per mole; (b) at least one scale control agent selected from the group consisting of water-soluble polycarboxylates, phosphonates, metal salts, sulfonates that are chemically different from the at least one material (a), and mixtures thereof; and (c) at least one friction reducing agent comprising a water-in-oil emulsion composition comprising:
(i) 5% to 99% by weight of a water-in-oil emulsion polymer comprising polyacrylamide comprising one or more repeat units according to Formula I: wherein each occurrence of R1 is independently selected from H, methyl and ethyl; n is an integer from 10 to 10,000,000; Z is selected from —O— and —NR2-; and each occurrence of R2 is independently selected from the group consisting of H, C1-C22 linear, branched or cyclic alkyl, aryl, alkaryl, aralkyl or alkenyl group,-R3-NR22,—R3-N+R23 X, and —R3-SO3Y, wherein R2 is as previously defined; R3 is a divalent linking group selected from the group consisting of C1-C22 linear, branched or cyclic alkylene, arylene, alkarylene, aralkylene or alkenylene, poly(ethyleneoxide) and poly(propyleneoxide); Y is H or an alkali metal ion; and X is a halide or methylsulfate, wherein the polyacrylamide has a molecular weight of 1,000,000 to 50,000,000 grams per mole;
(ii) 0.1% to 10% by weight of one or more inorganic microparticles;(iii) 0.5% to 90% by weight of a carrier solvent; and(iv) 0 to 90% by weight of a fluidizing agent. |
