NOVELTY - Scale inhibition treatment of an oil or gas production well, comprises injecting a scale inhibition composition into the oil or gas production well or applying a scale inhibition composition to the surface to be treated, where the scale inhibition composition comprises at least one polymer, each polymer comprising recurring units of a first monomer and a second monomer, the first monomer is maleic acid, maleic anhydride, fumaric acid, acrylic acid and/or their salts, and the second monomer is vinyl sulfonic acid, allyl sulfonic acid, methallylsulfonic acid and/or their salts.    USE - The process is useful: for scale inhibition treatment of an oil or gas production well (claimed) and in aqueous mediums for inhibiting or reducing formation of calcium sulfate, barium sulfate, and/or calcium carbonate; in oilfield injection and production waters, comprising topside, downhole and rock formation squeeze applications at well site; and to treat scale in any water system comprising cooling tower water systems, petroleum wells, downhole formations, geothermal wells and other oil field applications, boilers and boiler water systems, mineral process waters, paper mill digesters, washers, bleach plants and white water systems, black liquor evaporators in pulp industry, gas scrubbers and air washers, continuous casting processes in metallurgical industry, air conditioning and refrigeration systems, industrial and petroleum process water and waste treatment systems in clarifiers, liquid-solid applications, municipal sewage treatment and industrial or municipal water systems.    ADVANTAGE - The process: utilizes composition which is applied to any surface; provides threshold inhibition of scales, has high calcium and barium tolerance, and provides functioning inhibition downhole under high temperature and high pressure conditions; and provides necessary or desired antiscalant function; and prevents precipitation of insoluble scale.    DETAILED DESCRIPTION - Scale inhibition treatment of an oil or gas production well, comprises injecting a scale inhibition composition into the oil or gas production well or applying a scale inhibition composition to the surface to be treated, where the scale inhibition composition comprises at least one polymer, each polymer comprising recurring units of a first monomer and a second monomer, the first monomer is maleic acid, maleic anhydride, fumaric acid, acrylic acid and/or their salts, the second monomer is vinyl sulfonic acid, allyl sulfonic acid, methallylsulfonic acid and/or their salts, the concentration of the polymer is 10-60 wt.% of the composition, and the composition has a pH of 7-8.5. An INDEPENDENT CLAIM is also included for the composition for scale inhibition comprising the at least one polymer.