Cement system suitable for ultra-deep well cementation and preparation method thereof

By using a mixture of quartz sand and nanosilicon dioxide in the ultra-deep well cementing cement system and a reinforcement made of strength-stabilizing materials A, B and crystal-form-induced materials, combined with high-temperature stabilizers and dispersants, the problem of strength decay of cement stone in ultra-high temperature environment is solved, and the high-temperature compressive strength and high-temperature resistance of cement stone is improved, and the construction requirements of ultra-deep well cementing projects are met.

CN119638290AActive Publication Date: 2025-03-18JIAHUA SPECIAL CEMENT
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Patent Information

Application Number
CN202411876627.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-18
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

The prior art cannot effectively prevent the strength of cement stone from declining under ultra-high temperature environments, and cannot meet the construction requirements of ultra-deep well cementing projects.

Method used

A cement system suitable for ultra-deep well cementing is adopted, including G-level oil well cement, the first reinforcement material (a mixture of quartz sand and nanosilicon dioxide), the second reinforcement material (composed of mixing strength-stabilizing material A, strength-stabilizing material B and crystal-form-induced material), high-temperature stabilizers and dispersants. Through the synergistic action of these components, the formation of low-calcium-silicon specific hydration products is controlled and the high-temperature resistance of cement stone is improved.

Benefits of technology

It effectively alleviates the problem of strength decline in cement stone under high temperature conditions, improves the compressive strength and high temperature resistance of cement stone, meets the construction requirements of ultra-deep well cementing projects, and is characterized by green and environmentally friendly and low-cost.

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Abstract

The invention discloses a well cementation cement system suitable for an ultra-deep well and a preparation method of the well cementation cement system. The well cementation cement system comprises the following components in percentage by weight: 51-68wt% of G-grade oil well cement; 10 to 15 wt% of a first reinforcing material; 20 to 30 wt% of a second reinforcing material; 1-2 wt% of a high-temperature stabilizer; 1-2 wt% of a dispersant; the first reinforcing material is formed by mixing quartz sand and nano silicon dioxide according to the mass ratio of 15: 1. The well cementation cement system has excellent engineering performance, the admixtures have good adaptability and high high-temperature compressive strength and do not decline, a large amount of solid waste is used as main raw materials, and the well cementation cement system has the advantages of being environmentally friendly and low in cost.
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