The single cone bit is one of the cone bits used in oil and natural gas drilling. Compared with the most commonly used tri-cone bit, it has the following characteristics
(1) The full drill bit has only one cone, and the structure is simple. It is especially suitable for drilling small holes (the diameter of the drill bit is less than 152.4 mm).
(2) Under the condition of the same drill bit diameter, the bearing size of the single-cone bit is much larger than that of the tri-cone bit, so it can withstand a larger weight on bit, a higher drilling speed and a longer Bearing life.
(3) The cone of a single cone bit revolves around the axis of the bit and also rotates around the shaft journal of the claw. Each tooth on the cone impacts and crushes the rock at the bottom of the well while still on the surface of the bottom of the well. Long-distance sliding along different trajectories produces a cutting effect on the bottom hole rock, forming a bottom hole pattern with a net-like cutting trajectory. For the rock with greater plasticity in the deep part of the formation, this mesh cutting rock breaking method is more effective than the impact, pressing, and scraping rock breaking methods of the tri-cone bit.
(4) Tri-cone bits are generally speed-increasing bits, that is, the speed of the cone is higher than that of the bit. The single-cone bit is generally a deceleration bit. The rotation speed of the cone can be 20-50% lower than that of the drill bit, and it can adapt to large-scale rotation speed changes. Therefore, the single-cone bit is more suitable for downhole power drilling tools than the tri-cone bit. The requirements for the characteristics of the drill bit speed.
single cone bit for core barrel