Well liner with selective isolation screen

Abstract

A well liner having a selective isolation screen comprises an elongate base pipe having a predetermined number of openings therethrough which is surrounded by circumferentially spaced, longitudinally extending spacer bars, one or more annular cylindrical sleeves secured to the exterior of the base pipe and a continuous wire wrapped therearound to form an inner annulus isolated at predetermined vertical locations corresponding to specific well requirements of varying lengths and production formations within the wellbore. The continuous wire is wrapped over the spacer bars and sleeves in a spaced spiral configuration to provide a predetermined constant gap between the wire wrapping. The gaps in the wire wrapping are sized to stop the movement of the formation sand and allow continual flow of fluid into the wellbore. Gravel or other particulate matter may be pumped down the borehole in the outer annulus between the interior of the borehole or an outer casing and the outer surface of the wire wrapping. The gravel and other particulates are sized to restrain movement of the formation sand and the screen openings or gaps are designed to restrain the movement of the gravel or particulates to allow continual flow of fluids therethrough.