中深部硬地层含砂砾岩,硬度大、研磨性高、机械钻速慢、冲击力大,常规PDC钻头易磨损、进尺少、机械钻速低,综合效益差。为了突破PDC钻头的局限性,提高其在硬地层中的适用性,对锥形PDC齿的切削破岩机理和规律进行数值模拟,通过与PDC复合片进行对比研究,揭示锥形齿破岩规律,并设计研制了一种同轨布齿锥形齿PDC钻头。同轨道锥形齿PDC钻头以复合片作为主切削齿,锥形PDC齿作为二级切削齿,在复合片和锥形齿的共同作用下,钻头具有犁削和切削的双重破岩效果,使得钻头在中深部硬地层中的抗冲击性能和破岩效率大大提高。现场应用结果表明,与牙轮钻头相比,该钻头机械钻速提高了104.2%,单只钻头进尺提高了89.2%;与常规PDC钻头相比,机械钻速提高了104.4%,单只钻头进尺提高了184.8%。 In the deep hard sandy sandy conglomerate, the hardness is high, the abrasiveness is high, the ROP is slow, the impact force is large, the conventional PDC bit is easy to wear, the ruler is less, the ROP is lower, and the comprehensive benefit is poor. In order to break through the limitations of PDC bits and improve their applicability in hard formations, the cutting rock breaking mechanism and rules of tapered PDC teeth were numerically simulated. By comparing with PDC composite plates, the breaking rules of tapered teeth were revealed , And designed and developed a PDC bit with conical teeth. The PDC bit with the same orbital conical teeth takes the composite sheet as the main cutting tooth and the tapered PDC tooth as the secondary cutting tooth. Under the combined action of the composite sheet and the conical tooth, the drill bit has the double rock breaking effect of plowing and cutting, The impact resistance and rock breaking efficiency of the bit in the mid-deep hard formation are greatly enhanced. Field application results show that compared with the roller cone bit, the bit penetration rate increased by 104.2%, a single drill into the foot increased by 89.2%; compared with the conventional PDC bit, the ROP increased by 104.4%, a single bit into the Increased by 184.8%.