Combined drill bit

A combined drill bit comprises a first drill bit body, a second drill bit body and a connector, the first drill bit body is a coring PDC drill bit body, the second drill bit body is a comprehensive drilling PDC drill bit body, the first drill bit body and the second drill bit body are both connected to one end of the connector, and the second drill bit body is located in the first drill bit body and concaved inwards in the first drill bit body. According to the combined drill bit, the comprehensive drilling PDC drill bit is embedded in the coring PDC drill bit, in the drilling process of well drilling, a rock core drilled through the coring PDC drill bit plays a role in centering the drill bit, the direction of the rock core cannot be changed along with a stratigraphic dip angle, and the drilled rock core is cut off through the comprehensive drilling PDC drill bit. 一种组合钻头，包括第一钻头、第二钻头和接头，第一钻头为取心PDC钻头，第二钻头为全面钻进PDC钻头，第一钻头和第二钻头均连接于接头的一端，第二钻头位于第一钻头内，且内凹于第一钻头。本实用新型涉及的组合钻头，在取心PDC钻头内嵌入一个全面钻进PDC钻头，在钻井的钻进过程中，通过取心PDC钻头钻