Adjustable well screen assembly

Wells – Screens

Reexamination Certificate

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Details

C166S320000

Reexamination Certificate

active

10488822

ABSTRACT:
An adjustable well screen assembly having a sand screen which is wrapped around a perforated base pipe and a perforated sleeve which is movably disposed concentrically inside the base pipe between a first, closed, and a second, open, position. In the first position of the sleeve the perforations of the sleeve and base pipe are unaligned and hydraulically isolated from each other and flow of fluids from the outer diameter of the screen into the interior of the sleeve is inhibited. In the second position the perforations of the sleeve and the base pipe are aligned and connected in fluid communication with each other and fluids are permitted to flow from the formation through the sand screen and the perforations of the sleeve and base pipe into the interior of the sleeve.

REFERENCES:
patent: 3993130 (1976-11-01), Papp
patent: 4691778 (1987-09-01), Pyne
patent: 5111883 (1992-05-01), Savery
patent: 5447201 (1995-09-01), Mohn
patent: 5922975 (1999-07-01), Butler et al.
patent: 6112815 (2000-09-01), Boe et al.
patent: 6220357 (2001-04-01), Carmichael et al.
patent: 6543544 (2003-04-01), Schultz et al.
patent: 2543213 (1984-09-01), None
patent: 2325949 (1998-12-01), None
patent: 2369382 (2002-05-01), None
patent: 01/29368 (2001-04-01), None
patent: 02/06593 (2002-01-01), None

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