Анотація:
In the 2000 m deep drilling process of hard rock by wire-line coring drilling, the diamond
bit with double-layer waterways and ultra-high matrix can not only maintain a relatively high penetration
rate, but also achieve a lifespan of 80 to 100 meters, saving the auxiliary operation time
significantly. With the measured data, the paper analyzes the down-hole drilling process of this
kind of diamond bit and its merits and drawbacks. The improvement suggestions of structure optimization
are also given at the same time.