Telescopic double -barrelled lifting sub

The utility model discloses a telescopic double -barrelled lifting sub, include and carry rings, bearing cap, external pipe connector, telescoping inner tube nipple joint, thrust bearing, bearing housing and inner tube bearing plate the telescoping inner tube nipple joint outer the telescoping inner tube nipple joint is coaxial is provided with with this external pipe connector. The utility model discloses a being connected between telescoping inner tube nipple joint and the external pipe connector can make outer tube, inner tube carry down simultaneously, saves support time, reduces the construction risk, raises the efficiency, be provided with the telescoping inner tube nipple joint in inner tube bearing plate central authorities, under carrying during the drilling tool, the length difference that exists between inner tube and the outer tube scalability between through telescoping inner tube nipple joint and external pipe connector adjust, and the scalability of lifting sub has guaranteed going on smoothly