johnson gravel pack screen for deep wells

A pre-packed well screen ( with gravel Pre-packed well screen )consists of one screen telescoped inside another, with an annulus filled with filter pack at the factory before shipment.

The pre-packed screen is designed especially for high capicity wells, these screens offer unique advantages over conventional rod based screens with respect to strength. it features include: collapse strength equal to pipe; double the tensile strength of standard rod based screen; a bioresistant, hydraulically superior (to silica sand) pack; a greater percentage of open area(for deep applications) than that of a conventional screen, due to the dual support construction. 
Benefits of the Pre-packed screen are;
Smaller borehole
No gravel placement
Increased strength
Thinner filter pack
Rekated product:oil gas well casing pre-packed screen