Well screen having a uniform outer diameter

摘要

A well screen is composed of a plurality of screen units (2) connected in series. Each of said screen units (2) has a cylindrical connecting section (3) at least at one end thereof and includes a plurality of support rods extending (6) in the axial direction of the screen disposed cylindrically about a section (4) of the screen other than the connecting section (3) at a predetermined interval in the circumferential direction of the screen, and a wire (8) wound on the outer periphery of said support rods (6a) so as to form slits (7) of a predetermined width. The well screen further includes outer diameter equalizing means (9) provided about adjacent ones of the connecting sections (3) of two of the screen units (2) connected to each other for substantially equalizing the outer diameter of said connecting sections (3) to the outer diameter of sections (4) other than the connecting sections (3).