Because one-cone bit has the advantages of the three-cone bit and the PDC bit and it makes for their disadvantages, so the one-cone bit is the important chose to drill the small well.

• 随着钻探新技术的发展，开发深井和超深井技术要求钻头尺寸小型化，由于单牙轮钻头具有三牙轮钻头和PDC钻头的优点，同时又弥补了二者的不足。