Well screen

摘要

A well screen is disclosed for positioning in a well bore to screen solid particles from the fluid produced by the well comprising a base pipe having a perforated wall and threaded connections for connecting the base pipe into a pipe string, a wire screen surrounding the perforated portion of the base pipe, a thin porous membrane comprising an inner layer of cloth of woven ceramic fibers wrapped around the wire screen and covered by a porous sleeve membrane of braided ceramic fibers, means for holding the ends of the porous cloth membranes in sealing engagement with the base pipe, and a perforated tubular metal shroud surrounding the ceramic cloth membranes to protect the membranes from damage when lowered into a well bore.