Double-sliding-sleeve type anti-backflow steam huff and puff steam injection tubular column

The invention provides a double-sliding-sleeve type anti-backflow steam huff and puff steam injection pipe column. A telescopic pipe, a heat insulation pipe a, a double-sliding-sleeve type steam injection valve, a heat insulation pipe b, a check valve type steam injection valve, a heat insulation pipe c and a screwed plug are sequentially connected. The outer wall of the heat insulation pipe a and the outer wall of the heat insulation pipe b are each sleeved with a thermosensitive packer. The double-sliding-sleeve type steam injection valve comprises a hollow valve body a, a steam injection opening is formed in the side wall of the valve body a, a sliding sleeve b is arranged in the valve body a and blocks the steam injection opening, a shear pin b is arranged between the side wall of the sliding sleeve b and the side wall of the valve body a, a valve seat b is fixedly connected into the sliding sleeve b, and a valve ball b is put into the sliding sleeve b. The sliding sleeve a is arranged in the valve body a