牙轮钻头选择钻压的原则是：根据设备及钻具、金刚石质量、数量等情况，以使钻头的效率高，进尺多，金刚石消耗少，为钻压的优值。
（1）表镶金刚石的牙轮钻头一般比孕镶钻头钻压要大；
（2）大颗粒表镶钻头比小颗粒表镶钻头总钻压小；
（3）优质金刚石镶嵌的牙轮钻头比劣质的钻压大。金刚石数量多钻压高，反之则
（4）浑圆状金刚石镶嵌的钻头比非浑圆状的钻压大，广电俱乐部
（5）新钻头开始钻进钻压要小多
（6）牙轮钻头口径大、壁厚、表镶螺旋状及胎体硬度大，钻压应大些，反之则小；
（7）岩石完整，中硬到坚硬及研磨性弱的岩层，可用较大的钻压。破碎、松软、研磨性强的岩层，钻压应小。
Definition oftricone bit
tricone bit
in the Oil and Gas Industry
A tricone bit is a drill bit with a head that is divided into three main parts.
The tricone bit consists of three rotating cones working inside each other and each with its own row of cutting teeth.
The tricone bit has three roller cutter cones with a series of teeth that crush rock on the rock face as they roll over the face.
A tricone bit is a drill bit with a head that is divided into three main parts