国内外PDC钻凿特性检测试验研究

针对PDC钻头在钻复杂硬地层中容易出现崩齿、碎裂、剥蚀脱层和过度磨损等问题,本文采用自主研发的PDC钻凿/磨铣特性检测试验装置对五种φ19 PDC片、五种φ16 PDC片和七种φ13PDC片进行了钻凿/磨铣特性进行了检测及评价.结果表明,不同厂家、不同规格PDC片切削性能各不相同,PDC钻凿特性有后期出刃型和直接出刃型两种.在相同条件下,后期出刃型钻速表现出由低到高再到低,直接出刃型表现为由高到低的特性,因此,在制造PDC钻头的过程中应合理选择PDC片规格尺寸,从而有效提高PDC钻头质量.

Experimental research on drilling and cutting characteristics of PDC bit at home and abroad

Aiming at the problems of being apt to teeth collapsing, cracking, corroding fallen layers and excessive wear and tear in drilling complex and hard formation of PDC bit, PDC drilling/milling characteristic test equipment independently self-developed was used and drilling/milling characteristics of five kinds of φ19 PDC sheet, five kinds of φ16 PDC sheet and seven kinds of φ13 PDC sheet were tested and evaluated. The results show that the PDC sheets from different manufacturers and different sizes have different drilling and cutting characteristics including latter diamond exposure and direct diamond exposure. Drilling speed is from low to high and then to low for the kind of latter diamond exposure, but from high to low for the king of direct diamond exposure. Therefore, to improve the quality of PDC bits effectively, the specification and size of PDC sheet should be chosen reasonably in manufacturing process of PDC bits.