Self-adaptive inflow control device, intelligent well completion pipe string and well completion method

The invention provides a self-adaptive inflow control device, an intelligent well completion pipe string and a well completion method, and belongs to the field of oil field well completion. The self-adaptive inflow control device comprises a main body, an inlet flow channel arranged on the main body, and a main flow channel and a branch flow channel which are respectively communicated with the inlet flow channel; a circular groove is formed in the main body; an annular baffle coaxial with the circular groove is mounted in the circular groove; an outlet hole is formed in the center of the circular groove; the outer wall of the annular baffle and the wall of the circular groove define a rotational flow channel; a rotational flow chamber is defined by the inner wall of the annular baffle; the other end of the main flow channel and the other end of the branch flow channel are respectively communicated with the rotational flow channel; a flowing groove is formed in the annular baffle; and the rotational flow chamb