Bionic self-compensating integrated high-matrix impregnated diamond coring bit

Abstract:

In view of the problem that the impregnated diamond bit teeth are independent of each other， and the bit is easy to slip and the individual tooth of the bit is easy to fail due to excessive force in drilling hard rocks， the bionic claw toe structure theory and the self-compensating concept are introduced to develop a bionic self-compensating integrated high-matrix impregnated diamond coring bit. In the integral cutting tooth design of the drill bit， reinforcement ribs are placed between individual teeth and also between individual tooth units to strengthen the strength of individual teeth， and in such a way， the individual teeth and the individual tooth units are connected to form a whole. In the process of drilling， the working lips of the bit teeth will produce multiple stress concentration zones that exceed the ultimate failure strength of rock， but are much lower than the strength of the bit matrix. It is not prone to produce a few stress concentration zones that approach or exceed the strength of the bit body. As a result， the bit provides better integrity， more uniform force， more efficient rock cutting， longer life， and better slippage resistance， especially in hard formations. The field experiment shows that the bionic self-compensating integrated high-matrix impregnated diamond coring bit has higher rock breaking efficiency and longer service life than the conventional bit.

Key words:bionic;self-compensating;integrated;high matrix;ring-tooth bit;impregnated diamond coring bit