10 5/8″ MR425 牙轮钻头

齿型结构与适用地层

外排凿形齿、内排锥形齿。适用于极软地层（低抗压强度，可钻性好），常见岩性：页岩、软石灰岩、砂岩、砾岩、软白云岩、煤层。

ORIGINAL · ENChisel on gage, conical on inner rows. Designed for very soft formations with low compressive strengths and high drillability such as shale, soft limestone, sandstone, conglomerate, soft dolomite and coal ore.

保径保护

保径唇口堆焊硬质合金，唇口与掌背加焊耐磨碳化钨。

ORIGINAL · ENHardmetal on shirttail lip; Wear resistant carbide on shirttail lip and lug.

• 直径 10 5/8″ / Φ270mm，重 74kg
• 接头 6 5/8″ API，轴承 Roller-Ball-Roller-Thrust Button/Sealed Bearing
• 推荐钻压 10,630–21,250 lbs，转速 90–120 rpm