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分析了塔北地区上部井段硬塑性地层机械钻速低的原因。针对该地层岩石硬度随井深增加而增加的特点，提出了φ４４４．５ｍｍ牙轮钻头的改型方案，可供设计新型牙轮钻头时参考。
The reasons for the low penetration rate of hard plastic strata in the upper section of the northern Tarim Basin are analyzed. In view of the characteristic that the rock hardness increases with the well depth, a modified scheme of φ444.5mm roller cone bit is proposed for reference when designing a new cone roller bit.