Wells – Screens – Porous material
Patent
1996-09-03
1998-04-14
Dang, Hoang C.
Wells
Screens
Porous material
166231, 166233, 2104971, E21B 4308
Patent
active
057381704
ABSTRACT:
A compact double screen assembly (20), which can be used alone or mounted on a perforated pipe base (22), has a plurality of rods (30) arranged in cylindrical fashion around an axis (23). A wire (34) is helically wound about the rods (30) and welded thereto at every intersection. Adjacent rods (30) are separated by an inter-rod gap having a slot distance X while adjacent turns of the wire have an inter-turn slot distance Y therebetween. The rods (30) are closely spaced together such that the inter-rod slot distance X is on the order of 80-120% of the inter-turn slot distance Y, and preferably equal to it. A packing cavity (42) is provided between the rods (30) and the wire (34) for accommodating a porous media or packing material (40). Specially tapered or concave sidewall surfaces on the rods (30) according to the present invention enhance the size of the packing cavity (42) and, when the assembly is mounted on a perforated pipe base 22, permit flow to take place beneath the rods through perforations (24) in the pipe base (22). Rods (30', 30", 30'", 30"") according to the present invention have a center of mass which is closer to a pipe base-contacting end (52) of the rod than to a wire-contacting apex (52) of the rod.
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Johnson Thin-Pack Screens (3 page brochure published earlier than 1993).
Clark Barry L.
Dang Hoang C.
United States Filter Corporation
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