西南石油学院钻头研究室进行了一种新的实验研究工作。他们测定了钻头在各种条件下工作时牙轮的瞬时角速度。实验曲线表明这个参数的变化是随机性的,但也有一定的规律。实验指出,牙轮的瞬时角速度同平均角速度差别很大。即使在单齿圈与平井底接触情况下两者之间的差别有时可达20～40％。这意味着过去所谓“纯滚动钻头”的牙齿实际上对井底有相当大的滑动,而且滑动的方向也在改变。该室的研究人员把钻头的纵向振动和 Southwest Petroleum Institute drill bit laboratory conducted a new experimental research. They measured the instantaneous angular velocity of the cone when the drill worked under various conditions. The experimental curve shows that the change of this parameter is random, but there are certain rules. Experiments show that the instantaneous angular velocity cone with a large difference between the average angular velocity. The difference between the two is sometimes as much as 20-40%, even with single-tooth rings in contact with the wellbore. This means that in the past so-called “purely rolling bits” of the teeth actually had a considerable slide to the bottom of the well, and the direction of sliding was also changing. The researchers in the room vibrated the drill bit longitudinally