Variable-precision rotary unblocking screen pipe and method

The invention discloses a variable-precision rotary unblocking screen pipe and method. The screen pipe mainly comprises an inner pipe, and inner pipe sand blocking holes are distributed in the surface of the pipe wall of the inner pipe; outer pipe sand blocking holes are distributed in the surface of the pipe wall of the outer pipe; the inner pipe is sleeved with a pipe hole of the outer pipe, an annular gap exists between the inner pipe and the outer pipe, and the inner pipe and the outer pipe can rotate relatively. A certain annular gap is reserved between the inner pipe and the outer pipe and can serve as a sand setting cavity for fine sand in the initial mining stage, the sand containing capacity of the screen pipe is improved, and the blocking period is prolonged. Other sand blocking media can be filled according to the specific stratum to serve as a conventional screen pipe. Through cooperation of different angles between the inner pipe and the outer pipe, hydraulic parameters under the same displacemen