Abstract In oil and gas drilling, the borehole temperature can be as high as 200 °C. Using a high pressure and high temperature drilling fluid tribometer, two different lubricant additives (Additives A and B) were introduced to reduce the coefficient of friction (COF) of the drilling fluid. Stribeck curve analysis at 125 °C shows that the sliding speed does not affect the dynamic COF and the oscillatory movement yielded relatively high static COF. Oscillatory and low speed movements were employed to study temperature effects, which showed Additive A exhibiting better tribological performance (26% and 9% static and dynamic COF reductions at 150 °C). Wear mechanisms were identified by scanning electron microscopy after the tribological experiments.

中文翻译：

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高温下油气钻井钻井液的 Stribeck 性能

摘要 在油气钻井中，井眼温度可高达200 °C。使用高压高温钻井液摩擦计，引入两种不同的润滑剂添加剂（添加剂 A 和 B）以降低钻井液的摩擦系数 (COF)。125 °C 下的 Stribeck 曲线分析表明，滑动速度不影响动态 COF，振荡运动产生相对较高的静态 COF。采用振荡和低速运动来研究温度影响，结果表明添加剂 A 表现出更好的摩擦学性能（150 °C 时静态和动态 COF 降低 26% 和 9%）。在摩擦学实验后，通过扫描电子显微镜识别磨损机制。