Importance

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Abstract

A sand-filtering screen-making technique and screen are disclosed, which involves an initial assembly of the sand-filtering screen over an underlying coarse screen. The sand-filtering screen has a mechanical, longitudinal overlap-type joint. End caps are fitted over the filtering screen which has already been preassembled to the underlying coarse screen. The assembly is then mechanically forced through a die to compress the end caps onto the assembled filtering screen and underlying coarse screen. That subassembly is then assembled onto a base pipe and secured. An outer shroud can then be secured to the underlying base pipe, overlaying the filtering screen. The ends of the subassembly comprising the filtering screen and the underlying coarse screen are sealed against the support pipe by a packing gland arrangement at both ends.

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First Claim