Resin cement system for high-temperature deep wells and preparation method thereof

By introducing components such as high-temperature volcanic ash material, aqueous epoxy resin and high-temperature slow-setting phosphoric acid solution into high-temperature deep well cement slurry, the problems of narrow cement slurry density, short thickening time and insufficient rheology performance are solved, and efficient cementite curing and corrosion resistance are achieved.

CN119750978APending Publication Date: 2025-04-04SINOPEC OILFIELD SERVICE CORPORATION +1
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Patent Information

Application Number
CN202411937473.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

In high-temperature deep well environments, existing cement slurry has problems such as narrow density range, short thickening time, insufficient rheology performance and poor corrosion resistance, which is difficult to meet the pump injection and curing requirements of high-temperature deep wells.

Method used

A resin cement system is adopted, and its raw material components include oil well grade G cement, high-temperature volcanic ash material, inorganic suspension stabilizer, high-temperature water-reducing agent, high-temperature retarding phosphoric acid solution, aqueous epoxy resin emulsion, aqueous curing agent emulsion and polyether polyol. By optimizing the ratio and process steps, the rheology and corrosion resistance of the cement slurry under high temperature environment are ensured.

Benefits of technology

It has achieved the expansion of the cement slurry density range, the extension of thickening time, the improvement of rheology performance, and has anti-carbon dioxide and hydrogen sulfide corrosion performance, meeting the high-temperature deep well pump injection and curing requirements.

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Abstract

The invention discloses a resin cement system and a preparation method thereof for high-temperature deep wells, wherein the raw materials include: 500 parts of oil well G-grade cement, 100 parts of high-temperature resistant volcanic ash material, 100 parts of inorganic suspension stabilizing material, 12-18 parts of high-temperature fluid loss reducer, 12-35 parts of high-temperature retarded phosphoric acid solution, 50-100 parts of water-based epoxy resin emulsion, 20-40 parts of water-based curing agent emulsion, 10-20 parts of polyether polyol and 320-360 parts of water. First, the high-temperature fluid loss reducer, the high-temperature retarded phosphoric acid solution, the water-based epoxy resin emulsion, the polyether polyol, the water-based curing agent emulsion and water are mixed to obtain liquid sample water, the remaining raw materials are dry-mixed with aggregate sample ash, and then the aggregate sample ash is uniformly mixed with the liquid sample water. The cement system can be used for wells with a depth of 4000-9000 meters, the fluid circulation temperature can reach 160°C, the cement has excellent high-strength and low-elastic properties after curing, and the rheological properties meet the requirements of high-temperature deep well pumping.
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