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A CALCIUM ALUMINATE CEMENT COMPOSITION CONTAINING A SET RETARDER OF AN ORGANIC ACID AND A POLYMERIC MIXTURE
A CALCIUM ALUMINATE CEMENT COMPOSITION CONTAINING A SET RETARDER OF AN ORGANIC ACID AND A POLYMERIC MIXTURE
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机译:包含固定酸有机酸和聚合物混合物的铝酸钙水泥组合物
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摘要
A cement composition for use in an oil or gas well, the cement composition comprises: a calcium aluminate cement; water; an organic acid; and a polymeric mixture comprising: (A) water; (B) citric acid; (C) a first polymer, wherein the first polymer: (i) comprises a cellulose backbone and carboxymethyl functional groups; and (ii) has a molecular weight of less than 100,000; and (D) a second polymer, wherein the second polymer: (i) comprises a lignosulfonate; and (ii) has a molecular weight of less than 100,000, wherein a test composition consisting essentially of: the cement; the water; the organic acid; and the polymeric mixture, and in the same proportions as in the cement composition has a thickening time of at least 5 hours at a temperature of 300°F (148.9°C) and a pressure of 10,000 psi (68.9 MPa).
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