9 7/8″ MR725 牙轮钻头

齿型结构与适用地层

外排锥形齿、内排卵尖形齿。适用于硬地层（高抗压强度），常见岩性：花岗岩、石灰岩、砂质砂岩、白云岩、燧石。

ORIGINAL · ENConical on gage, ogive on inner rows. Designed for hard and abrasive formations with high compressive strengths such as granite, limestone, sandy sandstone, dolomite and chert.

保径保护

保径唇口与掌背同时加焊硬质合金与耐磨碳化钨。

ORIGINAL · ENHardmetal and wear resistant carbide on shirttail lip and lug.

• 直径 9 7/8″ / Φ251mm，重 65kg
• 接头 6 5/8″ API，轴承 Roller-Ball-Roller-Thrust Button/Sealed Bearing
• 推荐钻压 39,500–59,250 lbs，转速 60–90 rpm