12.5in Tricone Rock drill bit for oil well drilling Why tricone drill bit are most widely used Due to impact, crushing and shearing rock breaking when roller cone rotates, the contact area between cone and bottom hole is small, the specific pressure is high, the working torque ...

Dongying Lake Petroleum Technology Co., Ltd.    [Minerals & Metallurgy]   [Metal & Metallurgy Machinery]   [2019-08-17 16:58:50 ]