Experimental study on selection of PDC cutting teeth based on thermal performance analysis
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摘要: 为提高PDC切削齿选型的可靠性,从热性能角度出发,分别对不同厂家的PDC切削齿进行常温激光拉曼、高温激光拉曼及热重等分析,并结合其高温磨耗比测试,分析PDC切削齿的残余应力、石墨化转变、热稳定性以及高温耐磨性等,综合评价不同厂家的PDC切削齿性能;同时,制作φ94 mm四翼弧角PDC钻头并进行现场钻进试验。结果表明:现场试验结果与PDC切削齿热性能检测和分析得出的结论基本一致。热性能优异的PDC切削齿高温磨耗比高,钻进性能表现出色,平均时效为25.0 m/h,平均寿命为266 m,相对于其他热性能稍差的PDC切削齿的均有不同程度的提高。故从微观角度完善和补充了PDC宏观检测方法,有利于提高PDC切削齿选型的准确性。Abstract: To improve the reliability of the PDC cutting teeth selection, from the perspective of thermal performance, the PDC cutting teeth of different manufacturers were analyzed by the laser Raman spectroscopy at room temperature and high temperature and the thermogravimetry analysis. Combined with high temperature wear ratio test, the residual stress, the graphitization transformation, the thermal stability and the high temperature wear resistance of the PDC cutting teeth were analyzed to comprehensively evaluate the performance of the PDC cutting teeth of different manufacturers. At the same time, four-wing arc angle PDC bits with diameter of 94 mm was made and the field drilling test were carried out. The results show that the field test results are basically consistent with the results of the PDC cutting teeth thermal performance testing and analysis. The PDC cutting teeth with excellent thermal performance have high wear ratio at high temperature and excellent drilling performance, with an average aging of 25.0 m/h and an average life of 266 m. Compared with other PDC cutting teeth whose thermal properties are slightly worse, their performances are improved in varying degrees. Therefore, it is helpful to improve the accuracy of the PDC cutting tooth selection by improving and supplementing the macro detection method of PDC from the micro point of view.
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Key words:
- PDC cutting teeth /
- thermal performance /
- arc angle PDC bit /
- field test
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