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文中研究了地温梯度、地表温度、入口钻井液温度、循环钻井液温度梯度和钻井液类型等因素对当量静态钻井液密度（ ＥＳＤ）的影响；建立了高温高压井中预测ＥＳＤ 的积分模型。结果表明：温度梯度对ＥＳＤ 影响很大。随温度梯度增加，ＥＳＤ 减小，且井口与井底ＥＳＤ 差值增大。随地表温度或钻井液入口温度增加，ＥＳＤ 减小，但不同初始温度条件下井口与井底ＥＳＤ 差值基本相同。不同钻井液体系的高温高压钻井液性能不同。静止时，随井深增加，ＥＳＤ减小；钻井液充分循环后，随井深增加，ＥＳＤ 增加。
In this paper, the effects of geothermal gradient, surface temperature, temperature of inlet drilling fluid, temperature gradient of circulating drilling fluid and type of drilling fluid on equivalent static drilling fluid density (ESD) were studied. Integral model of ESD prediction in HTHP well was established. The results show that the temperature gradient has a great influence on ESD. As the temperature gradient increases, the ESD decreases and the difference between the wellhead and bottomhole ESD increases. As the surface temperature or drilling fluid inlet temperature increases, the ESD decreases, but the difference between the well head and bottom hole ESD at different initial temperatures is basically the same. Different drilling fluid system of high temperature and high pressure drilling fluid performance. At rest, the well depth decreases and ESD decreases. After the drilling fluid is fully circulated, ESD increases with well depth.