两牙轮钻头是近几年发展的一种高效率软地层钻头。与一般三牙轮钻头相比,它的牙轮直径、壁厚、硬质合金齿的直径、嵌入深度和出露高度都比较大。由于钻头只有两个牙轮,因此,它给布置长喷嘴提供了足够的空间,使喷嘴的出口更接近于地层,这样就增加了冲刺和掘起地层的能力,从而提高了机械进尺。两牙轮钻头的寿命一般为100小时,机械进尺约30.48米/小时左右。 Two roller cone drill bit is a high efficiency soft formation bit developed in recent years. Compared with the general tricone bit, its cone diameter, wall thickness, carbide teeth diameter, depth and height of the embedding are relatively large. Because the drill has only two cone wheels, it provides enough space for the long nozzle to be positioned to bring the nozzle’s exit closer to the formation, increasing the ability to sprint and jack up the formation, thereby increasing mechanical footage. Two roller bit life is generally 100 hours, mechanical footage about 30.48 meters / hour.