一种宽温带固井用膨胀剂及含其的固井用膨胀水泥浆体系
By adding a wide-temperature-range cementing expansion agent with a specific composition to the cement slurry, the problems of insufficient expansion rate and compressive strength of cement stone under high-temperature conditions are solved, achieving good bonding between the cement sheath and the well wall and casing, and improving the sealing performance and safety of cementing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2022-09-01
- Publication Date
- 2026-07-17
AI Technical Summary
Existing expansion agents have low expansion rates and low compressive strength under high-temperature conditions, which cannot effectively improve the bonding quality of cement stone, resulting in poor bonding quality between cement sheath and well wall and casing, affecting the sealing and safety of cementing.
A wide-temperature-range cementing expansion agent is used, which includes a combination of halloysite, magnesium raw materials, calcium raw materials, modified materials and carbonaceous raw materials. By controlling the calcination temperature and specific surface area, the expansion performance and compressive strength of the cement stone are improved. The prepared expansion cement slurry system is suitable for a temperature range of 30℃-200℃.
Under high-temperature conditions, the expansion agent can effectively improve the expansion rate and compressive strength of cement stone, ensure good bonding between cement sheath and well wall and casing, prevent crossflow, improve cementing quality, and ensure the integrity of wellbore sealing.
Smart Images
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