| 摘要 |
A novel method for making improved cement fluid loss additives comprising copolymers of acrylamide having desirable viscosity and fluid loss control properties. The method combines (1) the use of oxygenated make-up water to dissolve acrylamide monomers, derivatives or mixtures thereof to form a reaction mixture for polymerization of the monomers with (2) a second "condition" or set of conditions. The second "condition" or set of condition s is either (a) using of two heating stages to induce polymerization, or (b) adding a small amount of acrylic acid to the reaction mixture before exposin g the reaction mixture to a temperature sufficient topolymerize the monomers. The two heating stages of (a) involve (i) an initial, lower temperature stag e followed by (ii) a higher temperature stage.
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