Low-density cement paste and preparation method thereof

By using temperature-sensitive polymer suspension agent in low-density cement slurry, the problem of poor suspension stability at high temperature is solved, the ash speed and rheology performance are improved, and the high temperature stability and compressive strength requirements of cementing construction are met. .

CN119143429AActive Publication Date: 2024-12-17CHINA NAT PETROLEUM CORP +2
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Patent Information

Application Number
CN202310711726.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-15
Publication Date
2024-12-17
Estimated Expiration
2043-06-15

AI Technical Summary

Technical Problem

The low-density cement slurry has poor suspension stability under high temperature conditions, which leads to problems of annular air leakage and pressure during cementing construction, and the slurry time is long, affecting construction efficiency.

Method used

The temperature-sensitive polymer suspension agent is adopted to form a stable network structure by introducing temperature-sensitive monomers, molecular weight regulators and carboxylic acid monomers, which prevent the upward movement of microbeads and materials, and improve the suspension stability of cement slurry and the lower downward movement. Gray speed.

Benefits of technology

The suspension stability and rheological performance of low-density cement slurry at high temperatures have been improved, with fast ash, good rheology and fast compressive strength, meeting the needs of cementing construction in Tarim Fuman Oilfield.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to low-density cement paste which comprises the following components in parts by weight: 100 parts of cement; 15 to 20 parts of micro silicon; 23 to 27 parts of microbeads; 2-4 parts of a suspending agent; 4-7 parts of a fluid loss agent; 2 to 3 parts of a retarder; 2-3 parts of a drag reducer; 0.1 to 0.2 part of a defoaming agent; and 80 to 85 parts of water. The cement paste has the advantages that the cement paste is fast in cement feeding, good in rheological property, good in stability at high temperature, excellent in water loss and fast in compressive strength development, and the cement paste is high in well cementation quality and high in operation efficiency.
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Citation Information

Patent Citations

  • Cement paste system for well cementation

    CN106957638A

  • Early strength type polycarboxylate superplasticizer as well as preparation method and application thereof

    CN107151294A

  • Low-density cement paste system

    CN111646737A

  • Thermal tackifying copolymer cement paste high-temperature stabilizer and preparation method thereof

    CN111808231A

  • Cement paste system for long-cementing-section large-temperature-difference cementing

    CN112961658A