Abstract:

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.

Key words: PDC bit, hard formation, drilling and cutting characteristic, test and evaluation, specification and size