Large diameter bits (over 15-1/2”) with open bearings are designed for drilling upper well sections (surface hole drilling). Without sealing elements in the bearing, it is possible to maximize the journal and the rollers dimensions and to achieve full circulation in the bearing which is highly important as it helps reduction of the torque, providing quick cooling action and increasing bearing life.
This product line may have either milled teeth or TCI. To increase steel teeth life, steel teeth are hardfaced with wear-resistant tungsten carbide based material.
Depending on the rock hardness, either side surfaces or side and end surfaces of steel teeth are hardfaced. The gauge may be protected with tungsten carbide inserts. For additional protection against gauge loss, a near gauge of tungsten carbide inserts may be used.
Shirttail and leg protection
Shirttail is hardfaced along its leading edge.
Drilling bits for oil and gas industry
Roller cone bits
This product range only contains serial products, in case it does not contain the product you need, please submit a request for its manufacturing.
Volgaburmash and Uralburmash are Russia’s largest companies producing rock-cutting tools