초록 ▼

A particle control screen assembly for a perforated pipe used in a well, a sand filter system, and methods of making same are provided. The screen assembly includes a woven mesh filter media disposed about an inner surface of the perforated pipe, and a protective wrapper disposed about the filter me

A particle control screen assembly for a perforated pipe used in a well, a sand filter system, and methods of making same are provided. The screen assembly includes a woven mesh filter media disposed about an inner surface of the perforated pipe, and a protective wrapper disposed about the filter media. The protective wrapper comprises a radially inner perforated layer and a radially outer layer that is disposed between the inner layer and the filter media. A surface of the outer layer that faces the inner perforated layer has a non-smooth contour, with this surface of the outer layer having portions in direct contact with an outer surface of the inner layer. The outer layer is provided with apertures that are disposed in such a way that fluid cannot flow from the inner surface of the inner perforated layer directly radially both through holes of the inner layer and through the apertures of the outer layer.

대표청구항 ▼

[ What is claimed is:] [1.] In a particle control screen assembly for a perforated pipe used in a well, said assembly including a woven mesh filter media means disposed about an inner surface of said perforated pipe, and a protective wrapper means disposed about said filter media means, the improvem

[ What is claimed is:] [1.] In a particle control screen assembly for a perforated pipe used in a well, said assembly including a woven mesh filter media means disposed about an inner surface of said perforated pipe, and a protective wrapper means disposed about said filter media means, the improvement wherein said protective wrapper means comprises a radially inner perforated layer, and a radially outer layer that is disposed between said inner perforated layer and said filter media means, said outer layer having a first surface that faces said inner perforated layer, said protective wrapper means further comprising means disposed between said first surface of said outer layer and an outwardly facing surface of said inner perforated layer such that only portions of said first surface of said outer layer are in direct contact with said outwardly facing surface of said inner perforated layer, said outer layer being provided with apertures that are disposed in such a way that fluid cannot flow from an inner surface of said inner perforated layer directly radially both through holes of said inner perforated layer and said apertures of said outer layer.