Petroleum drill rod

The utility model relates to a petroleum boring tool, in particular to a petroleum drill rod. According to the technical scheme, the petroleum drill rod comprises a butt joint, a casing pipe, a drill rod body, a butt joint inserting groove and a connecting plug, the butt joint is fixed to one end of the drill rod body, the connecting plug is fixed to the other end of the drill rod body, a butt joint circular bead is arranged on the butt joint, a connecting plug circular bead is arranged on the connecting plug, the exterior of the butt joint circular bead and the exterior of the connecting plug circular bead are provided with external threads, the outer portion of the butt joint circular bead is connected with the casing pipe through the threads, the outer portion of the connecting plug circular bead is provided with a casing pipe circular bead for limiting the movement of the casing pipe, and the butt joint inserting groove is formed inside the connecting plug. The petroleum drill rod has the advantages of being simple in structure, convenient to connect and extremely high in abrasion resistance, and the service life of the drill rod can be prolonged.