三牙轮钻头尺寸列表：尺寸型号(IADC)英寸mm镶齿牙轮钻头钢齿牙轮钻头6152.4517,537,617,637126.127.216.217.316.346.34761/2165.1517,537126.127.216.217.316.346.34777/8200.0517,527,547,617,627,637126.127.216.217.316.346.34781/2215.9437,447,517,537,617,627,637126.127.216.217.316.346.34791/2241.3437,517,537,547,617126.127.216.217.316.346.34795/8244.5437,517,537,547,617126.127.216.217.316.346.34797/8250.8437,517,537,547,617126.127.216.217.316.346.347121/4311.1437,517,537,547,617,627,637126.127.216.217.316.346.347171/2444.5517,537,617,627,637126.127.216.217.316.346.34724609417,517,537,547,617,637126.127.216.217.316.346.34726660417,517,537,547,617,637126.127.216.217.316.346.347三牙轮钻头特点：每个型号的牙轮钻头都有基本的内部构造，油用牙轮钻头特别保径镶齿牙轮钻头在背锥齿与外排齿之间增加了一排楔形修边齿，修边齿的齿顶方向与圆周方向相切。结构特点：牙轮特别保径。油用牙轮钻头特别保径镶齿牙轮钻头在背锥齿与外排齿之间增加了一排楔形修边齿，修边齿的齿顶方向与圆周方向相切。特别保径钢齿钻头，除增加修边齿外，还改进了钢齿形状和堆焊材料，在齿排上采用反园弧齿角，增加了堆焊厚度，背锥部位堆焊采用了抗裂、抗冲击、耐磨的复合材料，t特殊结构技术可应用于各标准钻头系列，形成特殊钻头系列。油用牙轮钻头适应的钻井条件：适合软到中硬地层钻井；由于具有优异的侧切能力，配合适应高转速的轴承密封结构后，它是定向井、水平井钻井的理想工具。