利用深井破岩试验装置，模拟了不同井深（０～５ｋｍ）压力条件下对泥岩进行牙轮钻头单齿破岩试验，试验结果得出：随着井深（围压）的增加，岩石硬度增加，破碎岩石的力增加，岩石破碎体积减小，岩石破碎功增加，这是机械钻速低的根本原因，因此必须解决深井条件下的牙轮钻头齿形和布齿方式，以适应深井地层的钻进，达到提高机械钻速的目的。 The deep well rock breaking test device was used to simulate the single-tooth rock breaking test of mudstone under different well depth (0 ~ 5km) pressure. The results show that as the well depth (confining pressure) increases, the hardness of rock increases, Broken rock force increases, the rock crushing volume decreases, the rock crushing work to increase, which is the root cause of low penetration rate, and therefore must be resolved under the condition of the deep groove cone bit teeth and cloth teeth to adapt to the drilling of deep formations , To achieve the purpose of improving the penetration rate.