Fluid loss agent for oil well cement and preparation method of fluid loss agent

By leveraging the synergistic effect of polymer and composite hydration agent, a multi-protection mechanism is constructed, solving the performance degradation problem of oil well cement fluid loss reducing agent under high temperature and high salinity environment. This achieves simultaneous improvement in fluid loss reducing performance and cement stone strength, making it suitable for cementing operations in deep and ultra-deep wells.

CN122104184APending Publication Date: 2026-05-29SICHUAN WEIKETE PETROLEUM ENG TECH CO LTD
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Patent Information

Application Number
CN202610334044.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-18
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing oil well cement fluid loss control agents exhibit performance degradation under high temperature and high salinity environments, failing to effectively inhibit water loss and failing to balance fluid loss control performance with cement stone strength, resulting in poor cementing engineering quality.

Method used

By employing the synergistic effect of high molecular polymers and composite hydration agents, a continuous hydration film and micropore-filling barrier are formed. Combined with additives to regulate the cement hydration rate, multiple protection mechanisms are constructed to improve temperature and salt resistance and cement stone strength.

Benefits of technology

It significantly reduces water loss in high-temperature and high-salt environments, enhances the compressive strength of cement stone, ensures formation sealing capacity and long-term stability of oil and gas wells, and is suitable for industrial production.

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Abstract

The invention belongs to the technical field of oilfield chemical assistants, and provides a fluid loss agent for oil well cement and a preparation method of the fluid loss agent. The fluid loss agent for the oil well cement comprises the following raw materials: a high-molecular polymer, a composite hydrating agent, an auxiliary agent, deionized water and potassium persulfate, the high-molecular polymer is formed by graft polymerization of sulfonated polyethersulfone, acrylonitrile, hydroxyethyl methylacrylate and sodium allysulfonate monomers; the composite hydrating agent is formed by compounding and crosslinking TPEG-2400, silica fume, metakaolin and polyethylene glycol diacrylate. The preparation method comprises the following steps: mixing the raw materials, and carrying out constant-temperature stirring reaction. According to the fluid loss agent for the oil well cement, the temperature resistance, salt resistance, fluid loss reduction performance and set cement strength of the fluid loss agent can be improved through the synergistic effect of the raw materials, the preparation process is simple, the raw materials are easy to obtain, the cost is controllable, and the fluid loss agent is suitable for industrial large-scale production and can be suitable for well cementation operation in the deep well and ultra-deep well hypersalinity environment.
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