Multilayer well screens pipes are used for oil and water exploiting.
Characteristics:
~ They consist of two screens or multilayer screen
~ Perforated pipe inside, with perforations wrapped by the outside Johnson type screen
~ The screen jacket and base pipe are welded together with a length of coupling.
~ The base pipe can be made of seamless pipe or welded pipe, and more often, casing pipes.
~ ID of Johnson type screen equals OD of the perforated pipe.
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