FILTER FOR SUBTERRANEAN WELLS

摘要

A damage-resistant filter for use in subterranean wells has at least one layer of a filter medium (13), such as a sintered supported porous membrane, coaxially disposed about a perforated support member (11). The filter may also include a drainage layer (15) disposed between the inner support member and the filter medium, and a protective covering, such as a perforated cage (17), surrounding the filter medium (13). The filter is particularly suitable for removal of sand and other particulates from fluids produced in a well.