Drainage or Filter Layer for Well Screen Assembly with Integrated Stand-off Structure

摘要

An integral structure including woven wire cloth or non-woven metal filter medium for use as a drainage layer or filter layer in a well screen assembly is provided. A plurality of elongated members are welded on the woven metal cloth or non-woven metal filter medium to provide reduced resistance to flow parallel to a layer of the woven cloth. Segments of the woven or non-woven metal materials having elongated members joined thereto may be rolled into a cylinder to form a part of a well screen assembly.