Three-pipe layered water injection tubular column and use method

The embodiment of the invention discloses a three-pipe layered water injection tubular column and a using method, and belongs to the technical field of water injection. The three-pipe layered water injection tubular column comprises an inner-layer oil pipe, a middle-layer oil pipe, an outer-layer oil pipe, a first packing tool, a second packing tool and a third packing tool. The inner-layer oil pipe is located in the middle-layer oil pipe, the middle-layer oil pipe is located in the outer-layer oil pipe, the first end of the inner-layer oil pipe is sleeved with the first packing tool in a sliding mode, the first end of the middle-layer oil pipe is sleeved with the second packing tool in a sliding mode, and the first end of the outer-layer oil pipe is sleeved with the third packing tool in a sliding mode. In the embodiment of the invention, the three layers of oil pipes and the three packing tools form the three-pipe layered water injection tubular column, so that the structure is more simplified; in addition,