In drilling engineering, especially in petroleum and gas drilling, the wing bit is widely used due to its simple design and easy manufacture, good penetration rate and long footage in soft formations drilling, such as clay and shale formations. However in hard and soft-hard interbedded formations, especially in abrasive formation drilling, its penetration rate is low and rapid bit wear influence its service life.Третьяк А.Я ., who is a professor of South-Russian State Technical University, has worked out a cutting type two-tier wing bit Д-2ВВ, two conic rotating tiers are mounted on the bit body for pilot drilling and well drilling (not depending on each other and located at the same axis of rotation), driven by planetary gearing transmission mechanism. They can rotate in different (opposite) directions to guarantee that the cutter wings with several PDC composite plates passing the same distance in unit time, no matter where they are. In this case, the bit wear resistance is improved by uniform bit wear with improved technical and economic indexes of drilling. This technology has obtained the Russia invention patent.