Production pipe string

The invention provides a production pipe string. The production pipe string comprises an outer pipe, a packer and an inner pipe assembly, the inner pipe assembly is arranged inside the outer pipe in asleeved mode, the packer is located between the inner pipe assembly and the outer pipe, a first accommodating space allowing an external medium to enter therein is jointly formed by the outer pipe, the inner pipe assembly and the packer, the inner pipe assembly is provided with a first channel for allowing the medium to enter and a second channel for allowing the medium to flow out to a wellhead,and the first accommodating space, the first channel and the second channel communicate sequentially. The packer and the first accommodating space are located above a production layer needing to be treated, when the medium enters the first channel from the first accommodating space, a flow channel is transformed above the production layer needing to be treated, and the medium is directly injectedinto the position, needing