焊管2025，Vol.48Issue(9)：40-47,8.DOI:10.19291/j.cnki.1001-3938.2025.09.007
井下大功率电加热器用氧化镁绝缘材料多尺度选材准则研究
Research on Multiscale Material Selection Criteria for Magnesium Oxide Insulation in Downhole High-power Electric Heaters
摘要
Abstract
To address the engineering challenges of significant variability in high-temperature insulation performance and the absence of quantitative criteria for material selection of electrical-grade magnesium oxide(MgO),10 industrial-grade samples were selected and examined.Comprehensive evaluations were employed to detect 10 core physicochemical properties,including chemical composition,particle size distribution,phase composition(analyzed by XRD),microstructure(examined by SEM),compaction density,flow rate,and magnetic substance content.Simultaneously,the insulation strength was tested across a temperature range of 100 ℃ to 650 ℃.Multidimensional correlation analysis revealed that magnetic substance content,Fe2O3,and carbon impurities are the primary determinants of high-temperature insulation performance.Compaction density emerged as a critical structural parameter influencing insulation strength,while high-temperature stability was governed by phase purity and the type and quantity of additives.It establishes a quantitative correlation among composition,structure,and electrical properties of the electrical-grade MgO based on systematic multi-grade testing data.These findings provide data-driven support and a theoretical foundation for material selection in high-temperature applications.关键词
井下大功率电加热器/电工级MgO/高温绝缘性能/绝缘强度/定量关联模型Key words
downhole high-power electric heaters/electrical grade magnesium oxide/high-temperature insulation performance/insulation strength/quantitative correlation model分类
矿业与冶金引用本文复制引用
杨瑶,王和平,焦炜,肖群星,刘璇,张万鹏,汪海涛,窦茂科..井下大功率电加热器用氧化镁绝缘材料多尺度选材准则研究[J].焊管,2025,48(9):40-47,8.基金项目
中国石油集团公司关键核心技术攻关项目"井下大功率电加热器研制"(项目编号2024ZG23). （项目编号2024ZG23）
