What type of teeth on a roller cone bit provides the greatest amount of surface area and are used in abrasive formations?

What type of teeth on a roller cone bit provides the greatest amount of surface area and are used in abrasive formations?

• A. K type
• B. T type
• C. R type
• D. S type

Answer: (B)

In roller-cone bits, the amount of tooth surface that engages the rock controls how much rock can be cut in hard, abrasive formations. The T-type teeth are designed to present the greatest contact area to the formation, with broader faces and geometry that exposes more of the tooth to the rock and provides more cutting edges around the tooth. That larger surface area means more rock is engaged per rotation, which is especially advantageous when the rock is hard and abrasive, helping to maintain efficient cutting and resist wear. Other tooth shapes optimize for different conditions or wear patterns, but they don’t offer as much surface engagement as the T-type in abrasive formations.

In roller-cone bits, the amount of tooth surface that engages the rock controls how much rock can be cut in hard, abrasive formations. The T-type teeth are designed to present the greatest contact area to the formation, with broader faces and geometry that exposes more of the tooth to the rock and provides more cutting edges around the tooth. That larger surface area means more rock is engaged per rotation, which is especially advantageous when the rock is hard and abrasive, helping to maintain efficient cutting and resist wear. Other tooth shapes optimize for different conditions or wear patterns, but they don’t offer as much surface engagement as the T-type in abrasive formations.