The Research Status of Bearing Seal of Cone Bit at Home and Abroad

Cone bit drilling is the most important rock-breaking tool, its performance will directly affect the quality of drilling, drilling efficiency and drilling cost. High-speed roller bit bearing seal is the weakest link, but also wearing parts, is the most critical factor in determining the life of the high-speed roller bit. Field data statistical analysis showed that early damage caused by bearing failure drill 80 % of the total failure of the drill bit, due to early failure and severe wear of the seal bearing 30 % of the total failure of the bearing [1-2]. Sealing problem has become a serious impact speed cone bit drilling efficiency and drilling cost of technological bottlenecks, the current oil drilling project is urgently needed to solve the problem. Practice shows that current conventional cone bit bearing seal performance can not meet the requirements, especially in the high speed drilling, when lower seal life, sealing poor durability, seal wear, aging compared serious. Cone bits sealed condition very poor, including high temperature, high tempered medium, high load, and the size of a small sealed chamber, the working conditions and the environment will exacerbate the failure of the seal, but also to study the sealing tape to a lot of difficulties and challenges.