【摘要】 为解决常规PDC钻头在非均质硬地层中机械钻速低、钻头寿命短的问题，设计了具有多种切削结构的混合钻头。混合钻头以PDC齿作为1级切削元件，锥形PDC齿和孕镶金刚石齿作为2级切削元件，在PDC齿磨损后，锥形齿和孕镶齿参与破岩，集切削、犁削、磨削三重作用于一体，可提高钻头在复杂难钻地层中的使用寿命和破岩效率。新型钻头在青海油田东坪某井的变质砂岩和花岗片麻岩地层中进行了试验，机械钻速比常规PDC钻头提高了58.7%,具有明显的经济及社会效益。更多还原

【Abstract】 In order to solve the problems of low ROP and short bit life of conventional PDC bits in heterogeneous hard formations, a hybrid bit with multiple cutting structures was designed. Hybrid drills use PDC teeth as the first-level cutting element, and tapered PDC teeth and impregnated diamond teeth as the second-level cutting elements. After the PDC teeth are worn, the tapered teeth and impregnated teeth participate in rock breaking, integrating cutting, ploughing, and grinding. The triple action of cutting can improve the service life and rock breaking efficiency of the drill bit in the heterogeneous hard formation. The new drill bit was tested in metamorphic sandstone and granite gneiss formations in the Dongping X Well of Qinghai Oilfield. The ROP is 58.7% higher than that of the conventional PDC bit, which has obvious economic and social benefits.更多还原