Experimental Determination of Temperature of Synthetic Diamond Cutters when Cutting Rock

在某些切削条件下，合成金刚石切削齿可以显著改善岩石钻井作业，但在临界表面速度下，钻头的有效性急剧下降。人们认为，这种现象与机械强度的下降有关，而机械强度的下降伴随着刀具温度的升高。在研究中提出了在车床上用单个金刚石刀具切削花岗岩圆柱时，测量刀具表面附近温度的方法。安装在工具中的热电偶将提供温度作为切削参数（速度，冷却速率，侧面磨损）的函数，并将与来自3d力测力仪的力测量相关联。先前开发的有限元代码将用于解释温度测量，实验日期将用于验证代码的预测能力。研究计划的成功完成将允许设计现场测试，从而可以制定监测和控制井下切削齿温度的策略。这将有利于延长钻井寿命，同时加快钻井作业速度，从而为恶劣环境下的深层油藏节省大量成本。

Synthetic diamond cutters can significantly improve rock drilling operations under some cutting conditions, but at a critical surface speed the effectiveness of the drill drops off precipitously. It is felt that this phenomena is associated with the decrease in mechanical strength which accompanies an increase in cutter temperature. In the research proposed the temperature near the cutter surface will be measured when granite cylinders are turned in a lathe using a single diamond cutter. Thermocouples mounted in the tool will provide the temperature as a function of cutting parameters (speed, cooling rate, flank wear), and will be correlated with force measurements from a 3-D force dynamometer. A previously developed finite element code will be used to interpret the temperature measurements, and the experimental date will be used to validate the code's predictive ability. Successful completion of the research plan will permit the design of field tests, which in turn could lead to a strategy for monitoring and controlling the down-hole cutter temperature. This would favorably impact the drill life while speeding the well drilling operation, resulting in significant savings for deep oil reservoirs in hostile locations.