A fluid loss additive for oil well cement and a method for preparing the same

Abstract

The application belongs to the technical field of oil field chemical additives, and provides a fluid loss additive for oil well cement and a preparation method thereof.The fluid loss additive for oil well cement comprises raw materials, i.e., a high molecular polymer, a composite hydration agent, an additive, deionized water and potassium persulfate; the high molecular polymer is formed by graft polymerization of sulfonated polyether sulfone, acrylonitrile, hydroxyethyl methacrylate and sodium allyl sulfonate monomers; and the composite hydration agent is formed by compounding and cross-linking of TPEG-2400, silica ash, metakaolin and polyethylene glycol diacrylate.The preparation method comprises the following steps: mixing the above raw materials, and obtaining the fluid loss additive after constant temperature stirring reaction.The fluid loss additive for oil well cement can utilize the synergistic effect among raw materials, improve the temperature resistance and salt resistance of the fluid loss additive, the fluid loss performance and the cement stone strength, and has the advantages of simple preparation process, easily obtained raw materials, controllable cost, suitability for industrialized scale-up production, adaptability to cementing operation in deep well, ultra-deep well and high salinity environment, etc.

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