An investigation is made into the effects of liquid carbon dioxide (LCO₂) cooling, minimum-quantity lubrication (MQL) and cutting speed in drilling. Experimental measurements of torque, thrust force and temperature are made over a wide range of process and operating conditions. The resulting empirical models are used to quantify the individual contributions of the controlled parameters on drilling performance, and to facilitate temperature-based process optimization. Of particular interest is the need to carefully adjust the LCO₂ flow rate for any combination of MQL flow rate and cutting speed. The optimization is validated both in simulation and actual drilling tests.

研究了液体二氧化碳 (LCO ₂ ) 冷却、微量润滑 (MQL) 和钻削速度的影响。扭矩、推力和温度的实验测量是在广泛的过程和操作条件下进行的。由此产生的经验模型用于量化受控参数对钻井性能的个体贡献，并促进基于温度的工艺优化。特别令人感兴趣的是，需要针对 MQL 流速和切割速度的任意组合仔细调整 LCO ₂流速。该优化在模拟和实际钻井测试中均得到验证。