PERMEABLE ISOLATION SECTIONED SCREEN

WIPO Patent Application WO1994015722

A3

A well liner having a selective isolation screen with a limited or less restrictive seal. The well liner includes an elongate base pipe having openings therethrough; surrounded by circumferentially spaced, longitudinal extending spacer bars for forming an inner annulus; one or more annular cylindrical sleeves secured to the exterior of the base pipe; and a continuous wire wrapping surround the spacer bars except at interrupted areas where the isolated permeable seal sections are placed. These seal sections are located at predetermined vertical locations corresponding to specific well requirements of varying lengths and production formations within the wellbore. The continuous wire wrapping and spacer bars are inverted within the permeable seal sections so that the wire wrapping substantially fills the inner annulus and a multitude of spacer bars spaced approximately equal to or slightly larger than the spaces between the wire wrapping form the outer most surface of the seal sections. The ends of the seal sections are coupled to the wire wrapping screen of the well liner for forming a continuous screen surface and seal. The continuous wire wrapping over the spacer bars in a spaced spiral configuration provides a predetermined constant gap between the wire wrapping. The gaps in the wire wrapping are sized to stop movement of formation sand yet allowing continual flow of fluid into and from the wellbore.

SPARLIN DERRY D (US)
NAGAOKA TADAYOSHI (US)

PCT/US1993/010486

September 15, 1994

November 01, 1993

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NAGAOKA KK (JP)
SPARLIN DERRY D (JP)
NAGAOKA TADAYOSHI (JP)

B09C1/00; E21B43/08; E03B3/18; (IPC1-7): B07B/

US4771829A	1988-09-20
SU973802A1	1982-11-15
US3908256A	1975-09-30
US4167972A	1979-09-18
US4657079A	1987-04-14
US4821800A	1989-04-18

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