A cement slurry for well cementation, its preparation method and application

CN119461954BActive Publication Date: 2026-07-07CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2023-08-10
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

High-sulfur natural gas wells and CCUS wells are prone to well leakage and inability to ensure the continuity of cement sheath during construction. Furthermore, conventional density cement slurry and ordinary low-density cement slurry with cenospheres are insufficient to meet the long-term corrosion resistance and sealing integrity requirements of cement sheaths, affecting the safe production of the wellbore.

Method used

Highly active, low-density, corrosion-resistant cement slurry is used. By mixing active materials, hollow glass microspheres, corrosion-resistant materials, and toughening materials into oil well cement, and combining the close packing theory, a cement slurry with good settling stability, high compressive strength, and low elastic modulus is prepared to ensure the long-term sealing integrity of the cement sheath.

Benefits of technology

It has enabled high-quality and rapid well construction, reduced the risk of wellhead gas leakage and annular pressure, improved the long-term sealing integrity of cement sheaths, and provided technical support for the exploration and development of high-sulfur natural gas wells and CCUS wells.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a cementing slurry and a preparation method and application thereof, the cementing slurry comprises oil well cement, active material, hollow glass microspheres, corrosion-resistant material, tough material, suspending agent, dispersing agent, fluid loss additive, retarder, defoaming agent and water; the density of the cementing slurry is 1.2-1.6 g / cm 3 . The preparation method comprises the following steps: (1) mixing oil well cement, active material, hollow glass microspheres, corrosion-resistant material, tough material, suspending agent, dispersing agent and fluid loss additive to obtain dry mixture; (2) mixing retarder, defoaming agent and water to obtain wet mixed agent water; and (3) mixing the dry mixture and the wet mixed agent water to obtain the cementing slurry. The cementing slurry provided by the application realizes high-quality and rapid well building, guarantees long-term sealing integrity of the cement sheath, and provides strong technical support for large-scale exploration and development of high-sulfur natural gas wells and CCUS wells and reduction of wellhead gas channeling and annular pressure bearing risk.
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